Manual of R800 R630A C310A

ZBL-R800

Multifunctional Rebar Detector

ZBL-R630A

Rebar Scanner

ZBL-C310A

Rebar Rust Detector

Operation Manual

Beijing ZBL Science & Technology Co.Ltd.

Operation manual of ZBL-R800, ZBL-R630, ZBL-C310A

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Contents

Conventions in This Manual.........................................................3

Chapter 1 General introduction.................... 4 1.1 Brief introduction....................................................................4 1.2 Major functions and characteristics ........................................4

1.2.1 Major functions .........................................................4 1.2.2 Major characteristics................................................5

1.3 Major technical indexes..........................................................5 1.4 Attentions................................................................................5 1.5 Maintenance............................................................................6 1.6 Responsibilities.......................................................................8

Chapter 2 Instrument description .................. 9 2.1 Components ............................................................................9

2.1.1 Host ............................................................................9 2.1.2 Sensor and electrode ............................................11 2.1.3 Fittings .....................................................................12

2.2 Testing principles..................................................................13 Chapter 3 Software of ZBL-R800 multifunctional rebar detector ....................................... 16

3.1 Brief introduction of the software.........................................16 3.1.1 Starting-up interface and Main menu ..................16 3.1.2 Keyboard operation ...............................................17

3.2 Data Output...........................................................................17 3.2.1 USB transmission...................................................18 3.2.2 GPRS transmission ...............................................19

3.3 System setting.......................................................................20 3.4 Introductions of rebar test .....................................................21

3.4.1 General-scan ..........................................................22 3.4.2 Grid-scan .................................................................31 3.4.2.3 Measurement steps ............................................35 3.4.3 Profile-scan .............................................................42 3.4.4 Data display ............................................................44 3.4.5 Rebar data deletion................................................47


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3.4.6 On-site test ..............................................................48 3.5 Introduction of rust test.........................................................55

3.5.1 Main menu of rust test...........................................55 3.5.2 Introduction of main menu ....................................56

Chapter 4 Guide of quick operation ............... 62 4.1 Rebar test ..............................................................................62

4.1.1 On-site preparation ................................................62 4.1.2 To connect sensor to host .....................................62 4.1.3 Starting test .............................................................63 4.1.4 Data transmission ..................................................63 4.1.5 Data analysis and process....................................63 4.1.6 Data deletion...........................................................64

4.2 Rust test ................................................................................64 4.2.1 Preparation before test..........................................64 4.2.2 Starting rust test .....................................................67 4.2.3 Data check ..............................................................68 4.2.4 Data transmission ..................................................68 4.2.5 Data analysis ..........................................................69 4.2.6 Data deletion...........................................................69

4.3 Attention for field detection..................................................69 4.3.1 General principles of rebar test............................69 4.3.2 Attention for rust test..............................................70


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Conventions in This Manual

1. Word with gray background and black box is a button on the interface, e.g. OK.

2. The keys on the instrument panel are represented by e.g.SAVE. 3. Word with white background and black box represent software menu command in Windows, and is a separator between different menu levels. e.g. FileOpen means the command of selecting Open under the File menu. 4. Word with gray background but without box indicates the name of the control (choice box, input box, etc.) of the popup window on the screen, such as the input box of File Name in the open-file window. 5. The sign means special attention is needed here. 6. Besides the descriptions in the manual, some prompt messages may show automatically in the use of the software. Please operate accordingly. 7. The software interfaces and photos in manual are only for reference. There will be changes with software upgrade and improvement of products. No further notice is provided.

Attention: This manual is the one for ZBL-R800 Multifunctional Rebar Detector. The operation manual of ZBL-R630A Rebar Scanner can be seen in the section of rebar test. ZBL-C310A Rebar Rust Detector can be seen in the section of rust test.


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Chapter 1 General introduction

1.1 Brief introduction

ZBL-R630A tests the thickness of concrete cover, rebar diameter, location and space. ZBL-C310A tests the degree of rebar corrosion and distribution. ZBL-R800 Multifunctional Rebar Detector a portable, integrative and multifunctional one combines the functions of both ZBL-R630A scanner for rebar test and ZBL-C310A detector for rebar rust test.

1.2 Major functions and characteristics

1.2.1 Major functions

1. Double function of rebar and rust test. 2. Identify rebar location, direction and distribution. 3. Test the thickness of concrete cover. 4. Test rebar diameter. 5. Qualify the thickness of concrete cover automatically. 6. Single-electrode testing of concrete rebar corrosion. 7. Double-electrode testing of concrete rebar corrosion. 8. Divide rebar corrosion in maximal 10 gray shades or color graphs. 9. Test data storage, check and transmission. 10. Analyze professionally with Test Data Processing Software.


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1.2.2 Major characteristics

1. Store data in U-disk. 2. While GPRS module is equipped on the detector, the data can be transmitted with GPRS, which is convenient and fast. 3. Place brief introduction of functions and operation manual inside, handy for check. 4. Draw contour map of corrosion potential 5. Soft backlight.

1.3 Major technical indexes

Figure 1.1 Major technical indexes

Item Index Measurement range of cover(rebar

diameter6mm-50mm) First range: 3mm98mm

Second range:3mm196mm Detection range of corrosion

voltage -1000mv+1000mv

Detection precision of corrosion voltage

0.1mv

Power supply mode lithium battery Inside (charge with standard configured charger)

Working time 38 hours Weight 0.9kg Volume 212mm134mm50mm Display 160*128, LCD

USB port Transmit with U-disk, with capacity


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before using the instrument. 2. Requirements for working environment:

Environmental temperature: 040 Relative humidity :< 90%RH; Long time sunlight perpendicular incidence is avoided. Anti-corrosion: when used under damp, dusty and full of

corrosive gas conditions, protective measures are necessary.

3. Requirements for storage environment: Environmental temperature:-20+60. Relative humidity: < 90%RH; Out of use, please place instrument into package, store in a

ventilated, cool and dry place, Long time sunlight perpendicular incidence is avoided.

If long time out of use, please charge and start up for a check regularly.

4. Avoid water. 5. Avoid usage under strong magnetic field, such as the nearby of

large electromagnet or transformer. 6. Shock-proof: During the process of usage or handling, avoid

severe vibration or shock.

1.5 Maintenance

1. Power supply: instrument charges with inside specific chargeable lithium battery, after full charge, it can work last for nearly 26 hours. When used, please pay attention to left of electricity. If lack of electricity, close instrument quickly and charge in time. Or it can lead to lost of testing data as a result of sudden blackout even damage to instrument. Avoid using other batteries or power supplies.


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2. Charge: When charged, plug the power supply into AC22010%V socket and plug charger into the instruments power supply .when the charge indicator is red, it is charging to the inside battery. When turning to yellow, it is completed. At that time, unplug the charger in time lest overcharge affects the battery service life.

Attention: To guarantee full charge, please charge 6-8 hours consecutively, at the same time, avoid charge under the environment of over 60. Long time out of use, charged battery will discharge and lead to decrease of electricity. Recharge before usage. While charged, a common phenomenon is instrument and charger will be heated in some extent. Good ventilation is necessary for heat dissipation.

Attention: Avoid charge with other power adapters, or it will cause damage to instrument.

3. Rechargeable battery: when battery is near the end of service life after frequent charges and discharges, if the battery works abnormally (cannot charge with electricity, cannot charge full or short time is used after full charge), it is probable that rechargeable battery has been damaged or reaches its end. At that time, please contact with our company, change a new one. Avoid short circuit of battery or approaching high source temperature.

4. Every time when used, proper cleaning for host and sensors etc is necessary against water or dirty into plug in or instrument, or it will lead to low performance even damage of instrument.

Attention: Avoid placing instrument and fittings in water or cleaning with wet cloth.

Avoid scrubbing instrument and fittings with organic solvent.


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Please wipe host and socket with clean and soft dry cloth.

1.6 Responsibilities

The instrument is sophisticated testing equipment. When user has one of the following actions or the other man-made destruction, the company does not undertake related responsibilities:

1. Violate the above requirements for working and storage environment; 2. Improper operation; 3. Open case arbitrarily or dissemble any components without permission; 4. Man-made or accident-caused severe damage to instrument.


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Chapter 2 Instrument description

2.1 Components

ZBL-R800 consists of host, rebar sensor, copper sulfate electrode, double electrode handle, rebar signal wire, rust signal wire, U-disk and charger. ZBL-630A consists of host, rebar sensor, rebar signal wire, U-disk and charger. ZBL-C310A consists of host, copper sulfate electrode, double electrode handle, rust signal wire, U-disk and charger.

2.1.1 Host

Following is the illustration of the host of R800 multifunctional rebar detector, only for reference.

(A) Detector


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(B) Side plate

Figure2.1 Outward appearance of host

2.1.1.1 Keyboard Keyboard is on the panel of host, function of each key is as follows.

Figure2.1 Table of functional key

Key name Function description MENU To go back to upper menu in the operating menu BACK To go back to previous menu ab _`

Up, down, left, right direction, shift to the target menus and options, parameter change, increase or decrease etc.

SAVE To save the test data, time, number and parameter, etc. ENTER Parameter choice and determination, or change of testing

direction.

Power key, opening and closing of instrument 2.1.1.2 Display screen Display screen is installed on instrument panel to present operating interface, test data and exchange information etc. 2.1.1.3 Charging port To charge instrument with battery charger attached with the instrument, 6~8 hours is suggested in order to have a full charge. 2.1.1.4 USB port Port for connection with U-disk is on the left side of instrument baffle. Plug specific U-disk into USB port, testing data will be transmitted to

Charging port

USB port Rebar sensor port

Rust electrode port


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U-disk through Data Output and then analyze the data in U-disk with computer software. 2.1.1.5 Sensor port It is used for connecting with sensor signal wire. 2.1.1.6 Nameplate On the back of instrument and sensor, nameplate consists of company name, manufacture date, instrument serial number etc.

2.1.2 Sensor and electrode

2.1.2.1 Rebar sensor With an integrative design, rebar sensor as shown in fig.2-2 can scan rebar and record displacement of sensor in real time accurately. While going forward, sensor scans rebar and backward, scrubs it.

Figure2.2 Rebar sensor

Sensor is directive. When sensor axis parallels with the direction of rebar, it is most sensitive, conversely, when sensor axis is perpendicular to the direction of rebar, the signal is weakest. Therefore, while measuring, sensor axis should be parallel with the direction of rebar and scans in the vertical direction.


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2.1.2.2 Copper sulfate electrode Copper sulfate electrode as shown in fig.2-3 has following features: stable electrode potential, under standard conditions, potential to calomel electrode is 703mV satisfying with theoretical results and potential difference below 1mV. Electrode is difficult for polarization. If copper sulfate crystal dissolves completely, the internal resistance of electrode is below 3k. Electrode has a long service life. If there is no damage to cavity, it can be used for a long time once irrigated and follow-up irrigation is allowed.

Figure 2.3 Copper sulfate electrode

2.1.3 Fittings

2.1.3.1 Power supply charger Entry plug connects with 100~240V AC power supply and exit plug into charging plug of host for charging of inside lithium battery. 2.1.3.2 Double-electrode handle When testing rebar rust with double-electrode, two copper sulfate electrodes should be installed on the handle (as shown in fig.2.4) which is used with stable space 20cm.


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Figure 2.4 Double-electrode handle

2.1.3.3 Signal wire Instrument signal wire consists of rebar sensor signal wire and rust electrode signal wire. Ports of these two signal wire are on the left of baffle. Please install according to chapter 4. 2.1.3.4 U-disk It is used to copy the testing data which saved in the detector into computer for further analysis. 2.1.3.5 Other fittings Please see the packing list.

2.2 Testing principles

1. Magnetic testing principle of rebar The sensor emits magnetic field to part of tested structure, at the same time, receives induced magnetic field produced by iron-like medium (rebar) in the scope of magnetic field and then converting to electrical signals. The host analyzes digitalized signal timely and shows with various ways such as graphs, data and sound etc to identify rebar location, cover thickness and diameter precisely, such as figure 2.5.


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Figure 2.5 Magnetic testing principle of rebar

2. Single-electrode and double-electrode method of rust test Singleelectrode method (as shown in fig.2.6) applies testing principle of half-cell self-potential method, the rebar under ionic environment can be seen as an electrode, after corrosion, electrode potential changed, therefore, potential reflects corrosion directly. As it is well-known, battery consists of cathode and anode. Since rebar electrode has only half feature of the battery, therefore it is called half-cell.

Figure 2.6 Single-electrode method

Double-electrode method (as shown in fig.2.7) also applies self-potential method. The difference only lies in that single-electrode method applies to outside exposed structure of rebar end, while double-electrode method applies to non-outside structure.


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Figure 2.7 Double-electrode method

When tested with single-electrode method, a constant potential reference electrode (copper sulfate electrode or agcl electrode) should be placed on the surface of concrete to form battery with rebar, the we can identify the potential distribution through testing the relative electric potential difference between rebar and reference electrode. Through summarizing statistical law between potential distribution and rebar corrosion, corrosion can be indentified through potential test. Double-electrode method needs putting two electrodes which distance is constant on the surface of concrete. Moving these two reference electrodes on the surface of concretes, if the rebars under the two electrodes are in the same state, there is no potential difference; if different, such as one is in corrosion, the other is not, potential difference can be measured and corrosion can be identified successively.


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Chapter 3 Software of ZBL-R800 multifunctional rebar detector

3.1 Brief introduction of the software

ZBL-R800 multifunctional rebar detector has both the function of rebar test and rust test. We can examine diameter of rebar and the thickness of cover of concrete rebar which diameter is between6 and50, and examine and describe corrosive situation of rebar. We will introduce rebar test and rust test respectively in the following chapters.

3.1.1 Starting-up interface and Main menu

After switched on, the first interface is the starting-up interface as shown in figure3-1(A). It presents basic information of detector consisting of name of manufacturer, model and name of detector, version number and date etc. After nearly two seconds, starting-up interface enters into the main menu as shown in figure3-1(B).

(A)Starting-up interface (B)Main menu

Figure3-1

The main menu has four options of Rebar Test, Rust Test, Data


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Output and Sys. Setup. The main menu interface displays with icons: anti-color display represents present selected option, normally display represents unselected one.

3.1.2 Keyboard operation

All the control operation are done through pressing keys in the keyboard panel. 1) ab_` is used to select option. While selecting one option, pressing the ENTERto enter into corresponding submenu. At the same time, ab_` can change parameter and switch options. 2) The LCD backlight of detector is closing as default after power is on. The backlight can enhance the recognition of LCD, allowing users to identify contents of display. After entering into main menu interface, pressing `to choose whether open or close backlight. 3)ENTERselects specific option. 4)SAVEstores data and parameter. 5)BACKgoes back to previous interface, MENU goes back to main menu. 6) is power switch.

3.2 Data Output

Data output interface is as figure3-2, Data Output has two types- USB transmission and GPRS transmission. USB transmits testing data into U-disk, then into computer for analysis by software. GPRS transmits testing information to server; users can login on server through client software to establish task of transmission and receiving, check and analysis of testing data.


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During the process of data transmission, rebar data and corrosion data is transmitted respectively. User selects data for transmission manually; storage file for rebar data is with the ext. name .801 while rust data is .802.

Figure 3-2 Data output option

3.2.1 USB transmission

(A)USB transmission option (B)USB transmission

Figure3-3 USB transmission Plugging the U-disk attached with instrument into USB port of the left side paddle, and then selecting Data Output in the option interface as shown in figure 3-2, pressing a,bfor USB Trans., and then pressENTERto enter USB Options interface as figure 3-3A. Selecting Trans. Rebar Data or Trans. Rust Data below USB transmission interface, and then pressing ENTER, instrument will start up U-disk power supply automatically. When transmission completed and please plug out U-disk present, unplugging U-disk from USB port of detector, and then pressing any key to go back to USB transmission option interface. For usage of software analysis,


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please refer to . Storage file for rebar data is with the ext. name .801 while rust data is .802. Detector has tips for whether deleting data automatically after transmission.

Attention: please do not unplug the U-disk during transmission lest errors are made during data transmission.

3.2.2 GPRS transmission

Selecting Data Output in the option interface as shown in figure 3-2, pressing a,b for GPRS Trans., and then pressing ENTERto GPRS options interface as figure3-4A. Selecting Trans. Rebar Data or Trans. Rust Data below GPRS transmission interface, and then pressing ENTER,detector will start up the power supply of GPRS module to connect with internet. During the connection, BACK key can cancel the connection and exit from the process. After successful connection, selected data can be transmitted automatically. During the process,BACK key can cancel data transmission and exit from it. After transmission, successful transmission and whether to backup data or not will be provided such as figure 3-4(B), it shows successful transmission of GPRS and it depends on user for the choice of data backup, ifENTERis pressed, it will enter into data backup such as figure 3-4(C). After backup, pressing any key will enter into data deletion interface just as in figure 3-4(D). While after deletion, it will go back to the GPRS transmission option interface of 3-4(A).if pressing b in figure 3-4(B), data backup will not be done and data deletion will be directly entered.


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A) GPRS transmission option B) GPRS transmission

C) USB backup D) Data deletion

Figure3-4 GPRS transmission Illustration: As GPRS connection and transmission is slow,

please wait for instrument tip patiently. If showing GPRS connecting or Sending data for long time, pressBACKto cancel connection or data transmission. GPRS module is optional, GPRS transmission can be used only on the instrument equipped with GPRS module.

Suggestion: After data transmission is completed, backup data with U-disk.

3.3 System setting

After entering into system setting interface as figure 3-5, displaying date and time dynamically. Users can modify year, month, day, hour, minute, second of system clock. The clock is 24-hour hex. Users can check battery state at the same time.


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Figure 3-5 System setting

Operation method: Pressing ENTERto entering into state of modification, then pressing _,`to adjust cursor to item needing modification. Pressing a,bcan increase or decrease by one. After modification, pressing SAVE to store the set time and go back to main menu. If there is no need to change current time, please press BACKorMENUto go back to main menu.

3.4 Introductions of rebar test

Rebar test is divided into General-scan, Profile-scan and Grid-scan. Press aandbkeys in main menu interface as shown in figure 3-1B to choose Rebar Test and press ENTER to enter into rebar test main interface as shown in figure 3-6.

Figure 3-6 Rebar test main menu


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3.4.1 General-scan

General-scan is the basic testing function of rebar test. The thickness of rebar cover and the diameter of rebar can be measured precisely with this function. After connecting the host and sensor with signal wire, press a and

b to shift to General-scan and press ENTERto enter into the parameter setting interface (as shown in figure 3-7) of general scan, and cursor will stay in the position Obj. No.

Attention: when entering into parameter setting interface, quantity of electricity will be tested. When it is too low, tip of lack of electricity, please charge will be presented on the middle of interface and vocal warning requires immediate charging, at that time, users should not continue parameter setting or tests, or data is easy to lost or make error. It is better to exit from testing interface and go back to main menu, then shutdown, finally change battery or charge. 3.4.1.1 Parameter setting After entering interface in figure 3-7, pressing a,bto select the parameter to be set, and ENTER for starting to set corresponding parameter. After all done, select Start Scan to enter testing interface or press MENUto go back to the main menu.

Figure3-7 Parameter setting


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Figure 3-8 Object number setting

The definition of parameters and methods of setting are as following. 1. Object No. Object No. is combined either by six digtals, or mixed group of letters and symbols. The default object No. is 000000. After rebooting, when entering into parameter setting interface, the last digit of last object No. (stored) pulsing one is the default object No. (the increasing order is based on soft keyboard order shown in figure3-8 until last symbol / ). For example, if the last stored object is 300009, when reentering into parameter setting interface, default object No. is 30000A. In the figure 3-7 interface, pressinga,bto shift cursor to Obj. No, then press ENTER to the interface as figure 3-8, the cursor is below the first character of object No. and pressing_,`adjusts cursor to any character for modification .Then pressing bto display soft keyboard below, the cursor occurring in the upper corner of the soft keyboard, to select input word bya,b,_,`,and after pressing ENTER, it will occurs in the cursor position of object No., at the same time, cursor in object No. will automatically move down to the next position and cursor in soft keyboard will disappear. If continuing change, please repeat the operation above. After the completion of modification, pressingSAVEkey to store this No., then cursor in the No. will disappear and will go back to parameter setting interface automatically.


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2. Diameter of rebar Setting diameter of tested rebar, the settable range is between 6 and 50mm, and the default value is the setting value of previous stored object. Pressinga,b in figure 3-7 to shift cursor to Dia., then press ENTERto set the diameter, pressing a orb key can increase or decrease by 1 rebar standard. Long time pressing of aorb key can increase or decrease the value consecutively. After it is done, pressingSAVEorENTERfor storage, cursor will disappear and go back to parameter setting interface automatically. 3. Thickness design Setting the thickness of tested concrete cover, settable range is 10-99mm; the default value is the set one of previous stored object. Pressinga,b in figure 3-7 to shift cursor to Cover, then press

ENTERto set the thickness of cover, pressing a or b for once can increase or decrease by one and long time pressing of these two keys, the value increase or decrease consecutively. After it is done, pressing the SAVEor ENTER, cursor will disappear and go back to parameter setting interface as shown in figure 3-7. 4. Object type The tested object type can be divided into 2, beam or floor. It is used for evaluation of excessiveness of tested thickness value automatically. Pressinga,b in figure 3-7 to shift cursor to Type, then press ENTERto set the type, pressing a and b for the shift. After it is done, pressing the SAVEor ENTER, cursor will disappear and go back to parameter setting interface. 5. Minimum thickness Setting of the minimum thickness of cover allowed by tested rebar in quick check; range is 0-99mm, default value is 0mm. When using


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it(setting non-zero value), if cover thickness of tested rebar is below the set value, the detector will warning danger, and do not present and store the tested thickness. Pressinga,b in figure 3-7 to shift cursor to Minimum, then press ENTERto set the minimum thickness, pressing a or

b for once can increase or decrease by one and long time pressing of these two keys, the value increase or decrease consecutively. After it is done, pressing the SAVEor ENTER, cursor will disappear and go back to parameter setting interface as shown in figure 3-7.

Attention: When the minimum thickness is setting to 0, the warning alarm will be closed. 6. Data correction In order to lower the effects for the measurement of cover thickness of tested rebar by adjacent abreast ones, it is better to set center distance from adjacent rebar to tested rebar. The detector modifies test result automatically and improve test accurately. It is divided into Manual and None. After starting, the default one is Noneno correction. While Manual means modifying based on center distance of adjacent rebars set manually and displays the measured results after correction. Pressinga,b in figure 3-7 to shift cursor to Corr., then press ENTERto set the correction mode, pressing a and b can achieve shift between Manual and None. If Manual is selected, inputable option is present on the right side and the range is 50-110mm. Pressing ` key can move cursor to digit, and a or b for once can increase or decrease by one and long time pressing of these two keys, the value increase or decrease consecutively. After it is done, pressing the SAVEor ENTER, cursor will disappear and go back to parameter setting interface as


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shown in figure 3-7. Attention: To use this function does not completely remove

the effects of adjacent rebars on tested result. 3.4.1.2 Test interface In the figure 3-7 interface, pressinga,bto shift cursor to Start Scan, then press ENTER to the interface as figure 3-9. In the test interface, pressingBACKcan go back to parameter setting interface in figure 3-7, while pressing MENU key, it will go back to main menu as shown in figure 3-1B.

Figure 3-9 Test interface of General-scan

1. Introduction of the interface 1) Scrollbarshow the relative distance between sensor and

rebar. Blankno rebar in sensing range of sensor Increasesensor is moving towards rebar Decreasesensor is moving away from rebar

2) Signal value the larger present sensor receiving signal amplitude, the closer to rebar.

3) Cur. Coverthe current thickness of cover, the equivalent distance (unit, mm) between sensor and rebar, the larger the equivalent value, the farther it is. When equivalent value exceeding measurement ranges of


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sensor, it is 0 and the minimum value of current thickness is the thickness of cover. (If users used data correction, it only shows measurement value not corrected one).

4) Coverdisplay of measurement value (unit, mm) of thickness of concrete cover automatically (If users used data correction, it shows the corrected value).

5) Dia. display of measurement diameter of tested rebar (unit, mm). pressing a key for measurement of diameter and thickness of cover (There is no need for the input of the diameter of tested rebar), please see detail description in chapter 3.4.1.3. After testing the diameter, it will display as follows:

Cover: *** ( measurement of the thickness of cover of rebar)

Dia.: *** (measurement of rebar diameter) 6) Sav. Num it is the stored amount of thickness of cover for

present object. 7) Qualification ratethe rate of qualified points of all the stored

thickness values in current object according to the specification of GB50204-2002.

8) Tip of excessiveness when the tested thickness of cover exceeds the range of specification, a tip will be presented !, or it will be blank.

9) Object No.display of current object No. 10) Status information:

a) Range: and is used for first and second range. b) Method of storage: A represents automatic storage

while M represents manual storage; c) Method of measurement: represents dense rebar


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measurement while blank represents general measurement: d) Method of correction: C represents correction while

blank for no correction. 2. Hotkey function In the test interface, there are following several functions operated and manipulated by hotkeys.

1) Choice of range--to select first range or second range. The first range is used for situations when the tested thickness of cover is relative small, the second range is used for relative large situations, represented by and respectively.

In the test interface shown in figure3-9, pressing ` for shift the range, and shown or in status bar. Every time entering into this interface, the default one is the first.

2) Method of storageto select the method of storage of tested result. It is divided into 2 typesautomatic and manual marked with A and M respectively.

Manual storage only when pressing SAVE key, instrument will store the measurement value of thickness of cover and rebar diameter. Automatic storagethe instrument will store the tested result of thickness of cover automatically into current object. In the test interface shown in figure3-9, pressing ` for shift and shows A or M in status bar. Every time entering into this interface, the default one is manual storage.

3) Method of measurementthe method of measurement is divided into general measurement and dense rebar measurement represented with blank or . In the test interface shown in figure3-9, pressing `for shift and shows blank or in status bar. Every time entering into this interface, the default one is general measurement.


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3.4.1.3 Measurement steps 1. Parameter setting See in 3.3.1.1 for parameter setting. 2. Resetting Method 1. In the parameter setting interface (figure3-7), please hold sensor in the air and away from ferromagnet. After selecting Start Scan option, it will enter into test interface as shown in figure 3-10 and the instrument will reset automaticallyafter nearly 4 seconds , screen of test interface will show the present thickness is 0then resetting is over waiting for measurement. Method 2. In the test interface as shown in figure3-9, please hold sensor in the air and away from ferromagnet. After pressing ENTER, the instrument will reset automatically and the present thickness will show in blank. After nearly 4 seconds, screen of test interface will show the present thickness is 0then resetting is over waiting for measurement.

Attention: 1) In the detection process, a reset operation should be done about every 10 minutes. 2) While doubt on the measurement data, measure again after resetting.

3. Identify the direction of rebar and thickness of cover

Figure 3-10 Measurement

Just as shown in figure3-10, placing sensor on the surface of tested


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concrete and paralleling with tested rebar, then moving sensor along a direction in a uniform speed, when sensor going towards rebar, scrollbar will be lengthen and the signal value will become larger and larger , current thickness value is decreasing(figure 3-11(A)); when the sensor going over rebar , the thickness value of cover will be locked automatically( figure 3-11(B)). If the method of storage is set in automatic storage, instrument will store the thickness of cover automatically and the storage amount will increase by 1 automatically at the same time. If it is set in manual storage, after instrument locking the thickness of cover, pressing the SAVEkey, the value will be stored and the amount will increase by one. When the sensor goes over rebar, the buzzer will alarm.

A) B)

C) D)

Figure 3-11 general test interface If you want to identify the rebars location and direction precisely, please operate as follows: 1) Moving sensor in a reverse direction and identifying the

location of minimum current thickness value, then equaling the current value with thickness of cover, therefore, the position of


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sensor is where the rebar is in (figure3-11(C)). 2) Rotating the sensor and making the signal in maximum state. At

that time, the direction of sensor is the direction of tested rebar.(figure3-11(D))

4. Measurement of rebar diameter 1) Resetting sensor in accordance with the method 2. 2) Identifying rebars location and direction precisely. 3) Placing the sensor above the tested rebar and paralleled with it.

Pressing a key, after about 2 seconds, the tested result of diameter will be directly shown in the position of Dia. The instrument will measure the thickness of cover simultaneously shown in Cover in figure 3-12. Under the mode of automatic storage, it will store diameter value and thickness of cover automatically and the storage amount increase by 1. Under the mode of manual storage, if pressing SAVE, it will store diameter and thickness of cover and the storage amount increase by 1.

Figure 3-12 Rebar diameter test

3.4.2 Grid-scan

Grid-scan mainly displays the distribution of grid-distributed rebar through grid diagram, and display the location of rebar and the thickness of cover at the same time.


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Firstly, connecting the host and the sensor with signal wire, then pressing a andbkeys in main menu interface as shown in figure 3-6, shifting to Grid-scan and pressing ENTERfor scanning, parameter setting interface will be presented in figure3-13 and parameter can be set. Then, detector firstly test the quantity of electricity (please see test of quantity of electricity in General-scan).

Figure 3-13 Parameter setting of grid-scan

3.4.2.1 Parameter setting The default values of all parameters are the set ones of previous stored object. The setting method is the same with 3.4.1.1. pressing aandb keys to shift to options for setting, and pressing ENTERfor selection, pressing aandb keys for modification and shifting and finally pressing SAVEto store the set value and exit from it.

1) Dia. Xthe diameter of awaiting measuring rebar in X direction and the setting range is 650mm, the default value is the set one of previous stored object.

2) Dia. Ythe diameter of awaiting measuring rebar in Y direction and the setting range is 650mm.

3) Cover Xthe thickness of cover of awaiting measuring rebar in X direction and the setting range is 1099mm.

4) Cover Y the thickness of cover of awaiting measuring rebar


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in Y direction and the setting range is 1099mm. 5) Correctionto set method of correction (please see in 3.4.1.1

for the definition of this parameter). It is divided into two typesautomatic and none, the default one after starting up is none. automatic means that instrument will correct automatically in accordance with testing thickness of cover and rebar space. When entering the grid-scan interface next time, the default method is the previous set one.

Selecting Start Scan in parameter setting interface, the set values will be stored, and then enters into testing interface as shown in figure 3-14.

Attention: while pressingENTER, please hold sensor in the air and get away from ferromagnet. If pressing BACKkey in testing interface, it can go back to parameter setting as shown in figure3-13 and can reset parameters. 3.4.2.2 Measurement and data display

Figure 3-14 Grid-scan

The contents and definitions in the interface in figure 3-14 are as follows:

1. Scrollbarshow the relative distance between sensor and rebar,


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the digit in scrollbar displays the current thickness of cover, a little difference compared with data of general scan.

Blankno rebar in sensing range of sensor Increasesensor is moving towards rebar Decreasesensor is moving away from rebar

2. Current thickness of cover please see definition in 3.4.1.2 3. Coordinate on the top left

Figure 3-15 Superscripts of grid scan

The measurable length of X and Y is 1 meter in one screen, if more than 1 meter, then flip the page and the page number should increase by one. Rebar displacement in each screen is the coordinate within this screen (1m), cm is the indexing. If a rebar is identified in X direction when scanned for 2.6 meters, the result will be x02, the coordinate of the rebar is 60 cm.

4. Directionit shows the scanning direction of sensor, , represents X direction and Y direction scanning respectively.

In the left bottom, it shows the object No. and the set rebar diameter in current direction. In the status bar, it shows range, storage method, measurement method, correction setting etc. In the grid-scan, user can select range and method of measurement, please see in general scan for related contents. There are only two points different with general scan.

1) The grid-scan method only has automatic storage, that is A. 2) C represents data correction automatically.


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3.4.2.3 Measurement steps

1. Parameter setting It is same with General-scan in parameter definition and operation methods. 2. Resetting Method 1. In the parameter setting interface(in figure 3-13), please hold sensor in the air and away from ferromagnet. After selecting Start Scan option, it will enter into test interface as shown in figure 3-14 and the instrument will reset automaticallyafter nearly 4 seconds , screen of test interface will show the present thickness is 0then resetting is over waiting for measurement. Method 2. In the test interface as shown in figure3-14, please holds sensor in the air and away from ferromagnet. After pressing ENTER, the instrument will reset automatically and the present thickness will show in blank. After nearly 4 seconds, screen of test interface will show the present thickness is 0then resetting is over waiting for measurement. 3. Pre-scanning When entering into interface in figure 3-14, after resetting, instrument can pre-scan. The purpose of pre-scanning is to identify the direction of measuring line and the starting point through initial scanning of distribution of rebar in X and Y direction. Instrument can measure location of tested rebar in the measuring interface as shown in figure3-14. When relative position between sensor and tested rebar has changed, current thickness of cover will be shown in the scrollbar. When sensor goes above the tested rebar, instrument will produce short beep, but there is no drawing of rebar and the tested data is not stored.


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Figure 3-16 Schematic diagram of pre-scanning

Just as shown in figure3-16, firstly in the scheduled scanning start area, identifies location of 2 or 3 rebars in X direction through the above method, then identifies location of 2 or 3 rebars in the direction of Y. The center of crossed area (just shown 0point in figure3-16) in X and Y direction of first and second rebar can used as the starting point of scanning. 3.4.2.4 Selecting the test direction Before scanning, the test direction for X or Y should be firstly selected. Pressing akey in the interface as shown in figure 3-14 for the shift of X and Y direction, or occurs in the bottom right , at the same time, in the status bar, default diameter will change into default diameter in X or Y direction in accordance with change of direction, please see in figure 3-17, 3-18 and 3-19.

Figure 3-17 X direction scanning Figure 3-18 X direction page-turning


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Figure 3-19 Y direction scanning Figure 3-20 Y direction page-turning

3.4.2.5 Grid scanning If it is X direction at first, the sensor is placed in the zero position determined in pre-scanning(the starting point in figure 3-16) and paralleled with tested rebar of Y direction. Pressing SAVEkey, a square cursor (hereafter referred to as sensor cursor) occurs, showing the present displacement of sensor(the displacement is relative one compared with coordinate points in this page). then, scanning can be started in X direction shown in figure3-17. Moving sensor in a uniform speed, when the senor is closer with rebar, scrollbar will lengthen gradually; the current thickness value in the upper right will decrease accordingly. When sensor goes over rebar, peep alarming, the tested rebar will be displayed in coordinate (shown in pachytene in figure3-17).Thickness value of cover and coordinates of tested rebar (the distance between rebar and the starting point , unit :cm) will be displayed in the upper side of rebar and the tested result will be stored simultaneously. At the same time, when sensor continues moving forward, instrument will measure the tested rebar consecutively; the tested rebar and the tested data will be shown in corresponding position of coordinate. When the scanning distance goes over the range of each screen, it will turn pages automatically shown in figure 3-18. The increase by


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1 in X direction shows a page turned. Going like this, until X direction is completed, pressing SAVE to end the storage state and the cursor disappears. Pressing a to shifting to another direction, the sensor is automatically cleared; the default diameter and direction marker in Y direction will be shown in status bar. Pressing SAVEkey for scanning, the first scanned data in X direction will be displayed simultaneously. Test in Y direction operates the same with X direction. Each scrolling in Y direction will display first screen data in X direction as shown in figure3-20. The rebar in Y direction is drawn with thin line. PressingSAVEkey to end the scanning. During the test process, when the tested thickness of cover exceeds range of the standard requirements (based on designed thickness, calculating the maximum and minimum in accordance with GB50204-2002), ! symbol will occur, or it will be blank. If there is no second scanning, pressingBACKkey to go back to parameter setting interface or MENUto go back to main menu. Retest: in the test interface, if there is any data error, making sensor moves in reverse direction along the original path and goes back to the front of rebar with error, at that time, tested data and displayed rebar images are cleared. Continuing tests along the original path, retesting can be manipulated and overwrite the previous data.

Attention: Scanning speed is better not to be over 40mm/s. In dense rebar measurement, the scanning speed is better not over 15mm/s. 3.4.2.6 Second scanning Based on grid scanning, identifies the real distribution of rebar through various measuring lines in one or two directions.


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Specific operation: First step, prescanning based on previous description, identifies the direction and starting point of rebar. Second step, scanning in X and Y direction respectively based on above description, If firstly scanning in X direction, then in Y, the result should be the same as shown in figure3-21. Third step, reselect a direction in preparation for a second scan. Pressing a key to shift between X and Y direction, in this case, we assumes a scanning in X direction.

Figure 3-21 First scan Figure 3-22 Second scan

Fourth step, based on the rebar location after first scan (scanning in X and Y direction in the second step), scanning the central position between second and third rebar in Y direction for a second time (b2 measuring line in figure 3-24), pressing SAVEto scan, there will be cursor in the interface. The second scanning is same as the first just as shown in figure 3-22. Two points for attention:

1) In second scanning, it still displays rebar distribution in X and Y direction after first scan, however, it does not display the coordinates (position and thickness of cover) of each rebar.

2) In the second scan, it only displays coordinate of rebar but not draws while scanning over rebar.

Fifth step, when scan distance go over the distance displayed by one screen, the instrument turn to the second screen, as shown in


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figure3-23, zero point of coordinate in the upper left will increase one correspondingly. Users can continue scanning in this interface, The maximum distance can not be more than the maximal distance in the first scan of this direction in second step.

Figure 3-23 Second scanning in X direction

Figure 3-24 Second scanning in X direction

Sixth step, after scanning between the second and third rebar in Y direction, pressing SAVEkey to end this scanning. Seventh step, similarly, scans for a second time in the central position between the tested third and fourth rebar in Y direction (such as measuring line b3 shown in figure 3-24) and so on. Eighth step, after second scanning in X direction, pressing a key shifting to the other direction, in this case, it should be Y direction. Ninth step, principles of second scanning in Y direction are same as X direction, second scanning between the second and third rebar in previous scanning in X direction and between third and forth rebar in orderuntil the blank space between the No. m-1 rebar and No. m rebar. No. m rebar is the last rebar in first scanning of this direction as shown in figure3-25.


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Figure 3-25 Second scanning in Y direction

Second scanning in Y direction can be seen in figure3-26, figure (a) is the starting state of scanning in Y direction. Figure (b) is screen scrolling scanning state in Y direction.

Attention: The starting point of every measurement should be in same horizontal or vertical direction with first scanning.

Figure 3-26 Second scanning in Y direction

Illustration: X direction scanning in figure 3-24 starts from the leftmost first line (thin line for illustration) to right. Scanning in Y direction in figure3-25 starts from the top first horizontal line (thin line for illustration) to underside.

Figure 3-27 Actual distribution diagram


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After the operation is completed, transmitting tested data to computer, the data will be analyzed with Windows software and the actual distribution of rebar will be displayed as shown in figure3-27. The method of second scanning described above is a fairly standard mode of operation. Users do not have to scan between two adjacent steels one by one and cross-rebar scanning is allowed. Cross-rebar scanning is to scan for a second time with any measuring line from X and Y direction respectively based on the principles of second scanning described above. However, it needs manual recording of space between measuring lines in both first and second scanning in the same direction prepared for Windows software analysis. As to the usage of Windows software, users can seerebar data processing software manual .

Attention: In cross-rebar second scanning, the measuring line should keep away from the measuring line of first scan in the same direction. In restrict sense, the actual distribution diagram of cross-rebar scanning will have a little difference with standard second scanning. The usage of standard one is recommended to users.

3.4.3 Profile-scan

Profile-scan is a test displaying the location of tested rebar and thickness of cover with sectional distribution map. In main menu as shown in figure3-6, pressing a or b key, shifting to Profile-scan and pressing ENTERto enter into parameter setting interface shown in figure 3-28.


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Figure 3-28 Parameter setting interface of profile-scan

At that time, the system firstly detects the battery (see 3.4.1General -scan in power detection part), and prompts when the instrument battery is low. Figure 3-28 is the parameter setting interface, the parameter setting option and methods of setting is the same as general -scan and data correction with grid-scan-, please see 3.4.1.1 and 3.4.2.1 for specific definition and operation. After parameter setting, please select Start Scan and press

ENTERto store parameter and enter into the interface shown in figure3-29.

Figure 3-29 Profile-scan interface Figure 3-30 Profile scanning

Attention: while pressingENTER, please hold sensor in the air and get away from ferromagnet. The horizontal solid line in the central position of figure 3-29 is the designed thickness value, two upper and lower dotted lines are maximum and minimum of thickness of cover (the upper and lower range is calculated according to the set object type(beam or floor)and GB50204-2002 ). When the instrument displays the current thickness value is 0, the


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instrument reset operation is completed, and then you can pre-scan (see instruction in 3.4.2.3), you can also press SAVEkey to enter into test(a square cursor will occur in the top left corner), while testing, moving sensor in an uniformed speed, when sensor is getting closer to rebar, scroll bars lengthen gradually, the current thickness value decreases. When sensor goes over rebar, peep alarming, the tested rebar will be displayed in coordinate (shown in pachytene in figure3-30).Thickness value of cover and coordinates of tested rebar will be displayed in the upper side of rebar and the tested result will be stored simultaneously. When the moving distance is more than 1.2m and goes over the range of each screen, it will turn pages automatically, the amount of whole pages in the top left corner will increase by one. After the test is completed, pressingBACKkey to store testing data and go back to parameter setting interface in figure 3-28 for parameter resetting , and test again, or pressing MENUto go back to main menu.

Illustration: 1. Retesting, excessive display of profile scanning is same with

grid scanning for definition and operation. 2. User can select range and method of measurement in profile

scanning, see 3.4.1.1 for definition and operation. 3. Each screen of profile scanning can show 1.2m, while in grid

scanning, it is 1.0m.

3.4.4 Data display

It is mainly used for displaying of stored objects and their data and images. In the main menu as shown in figure3-6, pressinga orb to shift to the front of Data Display, then pressing ENTERto


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enter into data display interface as shown in figure3-31. The left side is list section of objects based on reverse stored order, that is, the last stored object is displayed first. The right side is data display section, it can display statistics of stored data of current object, the raw measurement data or graphics. PressingMENUkey in this interface, it can return to main menu interface.

Figure 3-31 Data display interface

Pressing a orb on interface in figure3-31, you can move cursor to the desired check object. Right side will display corresponding statistics of this object. PressingENTERto enter into data check state, displaying stored tested data of selected object. 3.4.4.1. Data check of General-scan

Figure3-32 General-scan data

If the object is tested by general-scan, the data display interface shown in figure 3-32, displaying default diameter, amount of stored data,


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maximum, minimum and average value of this object. Pressing ENTERkey to enter into interface as shown in figure3-33 for the stored data. The options in the figure have following meanings:

NO. serial number Diatested diameter value, if no data, no diameter test. Tthickness value of cover, if there is tested diameter value in Dia., then T is the thickness value measure by testing diameter the poor between tested diameter and default diameter. Sxthe tested thickness value is exceed or not, excessive with *, the other with blank.

If the number of stored data is more than one screen, please pressaor b key to turn to next page (the top of upward page-turning is the statistical interface), when in the interface, pressingBACKto go back to the interface in figure3-31. 3.4.4.2. Grid data check PressingENTERkey on the interface in figure 3-33(a), and entering into grid data display interface in figure3-33(b), pressinga,b,

_,` for page-turning check.

(a) (b)

Figure 3-33 Grid data check In any interface during data display, pressing BACKkey can go back to interface shown in figure3-33(a), and pressingMENUto go back to main menu.


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3.4.4.3. Profile data check PressingENTERkey on the interface in figure 3-34(a) to enter into profile data check interface shown in figure3-34(b) and pressing _,

`for page-turning. Compared with grid data display, the data shown in profile-scan is only in one direction.

(a) (b)

Figure3-34 Profile data check

3.4.5 Rebar data deletion

To delete all the stored data.

Figure 3-35 Data deletion

In the main menu interface as shown in figure3-6, pressinga or b to shift to the front of Delete Data and operate like follows: 1. Pressing ENTERto enter into data deletion interface as shown

in figure3-35. 2. Then pressingENTERto delete data, deleting will be shown

in the screen, after nearly 4 seconds, the deletion is completed


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and it will go back to main menu interface automatically. In the data deletion interface as shown in figure 3-35, pressingBACKto go back to main menu directly.

Attention: This function will delete all the data, please make sure to transmit data to computer before deletion.

3.4.6 On-site test

3.4.6.1 Parameters setting 1. To select the method of test in main menu and press

ENTERto enter into parameter setting interface 2. To set default diameter 3. To set minimum value of thickness to 0. 4. To set object No.(optional) 5. To hold sensor in the air without moving and keep away from

ferromagnet 6. To press BACKto enter into test interface 7. After nearly 3 seconds, the current thickness value will be 0,

then resetting is completed, entering into test state. Attention: before displaying 0 for current thickness value,

keep sensor away from rebar and other ferromagnet. Attention: During the measurement, resetting operation

should be done about every 10 minutes. 3.4.6.2 To locate rebar Generally, upper bars (or stirrups) should be located at first, and then locates the lower bars (or stirrups) through measuring the central position of the two upper bars, see fig.3-36. Moving sensor in a uniform speed along one direction on the surface of concrete, observing scroll bar, current thickness value, thickness of cover and buzzer sounds. By any of the following method, you can


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locate rebar.

Figure 3-36 Measuring line

1. Buzzer sounds. At that time, the instrument prompts sensor goes over rebar, then moving sensor in the opposite direction to find the location of minimum value of current thicknessexact location of rebar.

2. Signal value changes from small to big and then to small. When sensor gradually approaches rebar, signal value gradually becomes larger, or signal value becomes smaller. Location of maximum is the exact position of rebar. Signal value is the fundamental basis of measurement of thickness of cover. When the change of thickness of cover is within 1mm, the current thickness value will not change, but signal value can reflects minimal change. Therefore, according to it, you can locate the exact position of rebar more accurately.

3. The current thickness value changes from big to small, then to big.

When sensor approaches rebar, the current thickness value will gradually changes to smaller, or the current thickness value becomes bigger. Location of minimum thickness is the exact location of rebar.

4. Scroll bar lengthens gradually, then shorten.


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When sensor approaches rebar, the scroll bar will lengthen gradually, or the scroll bar will shorten gradually. The location of longest scroll bar is the exact position of rebar.

3.4.6.3 To orientate rebar You can take following two methods to orientate rebar: 1) After rebar location, rotating sensor above the rebar, the current thickness value and signal value in the upper left corner will change accordingly. When signal value is maximum and current thickness value is minimum value, at that time, sensor is parallel with rebar and the direction of sensor is the direction of tested rebar within concrete. 2) Measuring rebar location with two parallel measuring lines respectively, the connection of two points is the location of rebar. 3.4.6.4 To measure thickness of cover

1. Automatic interpretation Sensor parallels with rebar and sweeps above rebar in a uniform speed along the vertical direction of rebar. Instrument produces a voice of buzzing suggesting sensor goes over rebar, then value of cover will automatically update to the current thickness value of concrete. This method applies to rebar space larger than described in table 3.1.

Table 3.1

The rebars space a1, b1, a2, b2 is shown in fig.3-37.

The tested rebar on the upper level

The tested rebar on the below level

Thickness of cover

Parallel rebars

space a1

Vertical rebars

space b1

Thickness of cover

Parallel rebars space

a2

Vertical rebars space

b2 15 70 80 15 70 90 30 80 100 30 80 110 45 100 120 45 100 130 60 120 140 60 120 150


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(a) The tested rebar on the upper level (b) The tested rebar on the below level

Figure 3-37 Rebars space 2. Manual interpretation

This method applies to rebar space smaller than described in table 3.1. When the field situation is too complex to interpret automatically, you can determine thickness of cover based on changes of current thickness and signal value. When this value has 2 or more consecutive decline then two or more consecutive rise, it can be determined that there is rebar and the thickness of cover is the minimum value during the above process. For example, when the current thickness value changes as follows, there is rebar, 63-62-61-62-63 and the thickness of cover is 61.

3. To store the measured thickness of cover The thickness value automatically tested by instrument can be stored in group according to object No. It can store up to 992 objects and every object store up to 999 thickness value of cover. Every number stores the set default diameter value simultaneously and the default diameter value is used for measuring the first thickness of cover.

If the amount of storage is more than 0, the default diameter value cant be changed. 3.4.6.5 To measure thickness of cover on special occasion 1. Dense rebar measurement Users can select different measurement method based on the tested objects.

1) When rebar space of object is large, such as floors, it is better


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to adopt the general measurement mode. 2) When rebar space of object is small, such as beams, it is

better to adopt the dense rebar measurement mode. ZBL-R800 designs a specific measurement method to dense rebar objects.

In beams or pillars, there are often densely packed rebar, sometimes, the pure rebar space is about 1.5 times rebar diameter. Under this rebar distribution, there is little change of thickness value of cover, and generally rebar detector is difficult to indentify number and location of rebar.

At this point, it is recommended to use the method of dense rebar measurement. In the general-scan interface, pressing a key for a shift between general measurement and dense rebar measurement. When in dense rebar measurement, symbol will occur in status bar. Under dense rebar measurement, rebar location, measurement of thickness of cover, stored method is the same with general measurement.

When using dense rebar measurement, users should pay attention to following points:

1) The scanning speed should not be too fast, it is better to be less than 15mm/s.

2) During scanning, to maintain one-way movement of sensor and ensure the parallel between sensor and tested rebar.

3) To try to select the larger position of cross bars for measurement.

4) After completion of first scanning, it is recommended for an inspection in reverse order to improve its reliability.

Attention: when pure rebar space is less than 1.5 times rebar diameter and thickness of cover is greater than 2 times the space, the last rebar can not be interpreted automatically. Under


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this situation, it is generally measured with following methods: 1) To locate stirrups. 2) To select a scanning line in the middle of large space

stirrups. 3) To select one direction for scanning and mark the

rebar location. 4) To scan for a second time in reverse direction and

mark the rebar location. 5) If the two scan results are same, the measurement is

over. 6) If not, repeat the step 3 and 4. If the two sets of

measurement are in line with following features: the first scanning can determine A, B and C rebar, then in reverse direction, D, C and B will be identified. Therefore, almost certain that there are 4 steels in this object.

Figure 3-38 Dense rebar measurement

2. Minimum thickness of cover measurement It is mainly used for following situations:

1) After removal of moulding board, to test whether rebar is out or not.

2) Quick check of whether thickness of cover meets the minimum


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designed value. Operation steps:

1) To set default diameter of tested rebar diameter. 2) To set the minimum cover thickness value for alarm. 3) While scanning the tested object, when thickness of cover is

less than the set value, the buzzer alarms. Under this measurement mode, users can scan in a relative fast speed without noticing screen display. 3.4.6.6 Rebar diameter measurement

Table 3.2 Measuring range of rebar diameter (unit: mm)

Rebar diameter Minimum thickness Maximum thickness6 4 55 8 4 60 10 6 62 12 8 64 14 10 66 16 10 68 18 12 68 20 12 70 22 14 72 25 14 74 28 16 76 32 16 77 36 16 78 40 20 80 50 22 84

Firstly, to locate rebar accurately and to identify precise direction of rebar, placing sensor above the tested rebar and pressinga key, the word Dia. will be displayed on the screen. After a few minutes, diameter measurement will be shown directly on the screen and the tested thickness value of cover shown after Cover. is before this value to distinguish from thickness value tested by default


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diameter value. If the thickness value is less than the minimum value in table 3.2, Too small will be shown in the instrument and if it is above the maximum value in table 3.2, Too large will be displayed , at that time, rebar diameter cannot be measured. During measurement, when the thickness of cover is too small, it is recommended that a PMMA(or other non-metallic materials) is padded under sensor, the measured value minus the thickness of pad is the tested thickness of cover.

3.5 Introduction of rust test

3.5.1 Main menu of rust test

Pressinga,band_ key to select Rust Test, then pressingENTERto enter into rust test main menu as shown in figure3-39.

Figure 3-39 Main menu of rust test

In the main menu, user can set parameters such as object No., testing method etc., also can check or delete the stored data. Uniform principle for menu operation is:

1. Pressing aorbto select different menu options. 2. PressingENTERto enter into current option. 3. PressingMENUto go back to menu selection state. 4. PressingBACKto go back to previous state. 5. PressingSAVEto store parameter setting.


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3.5.2 Introduction of main menu

3.5.2.1 Object No. Object No. should correspond one by one with tested object. Every object No. can store up to 13 row 18 columns, a total of 234 potential values of measuring points. Object No. can increase automatically. After measurement of a survey area is complete, go back to main menu, then the object No. will increase by 1 automatically. When changing object No. manually, select the Obj. No. menu, and then operate as follows:

1. Pressing ENTERto enter into object No. adjustment state, at that time, cursor will occur at the last digit of No.

2. Pressing aorbto adjust this digit and pressing _ or`to select other data bits. The number adjustment can add or subtract value, the maximum is 999.

3. Pressing MENUto go back to menu selection state and continuing other menu operation.

4. PressingBACKto go back to previous state.

3.5.2.2 Test method Rust test is divided into single-electrode test and double-electrode test. Pressing aorbin main menu to move cursor to Method option, pressingENTERto enter into test method selection menu as shown in figure3-40, stays on the current test method for reference. Pressing aorb key to select test method, and pressing ENTER or SAVEto select certain test method and


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exit, or pressingBACKto abandon selection and go back to main menu.

Figure 3-40 Method of rust test

Figure 3-41 Single-electrode icon setting interface

3.5.2.3 Icon setting Pressing aorbkey in main menu to move cursor to Icon option, pressingENTERto enter into icon setting interface as shown in figure 3-41. In icon setting, different legend represents different potential value. The smaller black area of legend, the smaller potential value is, or, the larger potential value is. Users can easily determine possibility of rebar corrosion based on legend distribution in survey area. Pressing _, `or ENTERto move cursor and shift between maximum and minimum, pressing aorb to increase or decrease current value with 10mV steps. When adjusting the maximum and minimum, the voltage range represented by different legend in the left side will be updated simultaneously. PressingBACKor MENUto go back to previous menu.


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3.5.2.4 Settings of scan area

Figure 3-42 Scan area setting interface

Pressing aorb in main menu to move cursor to Scan Area option, pressingENTERto enter into survey area setting interface as shown in figure 3-42. X-dot Pitch and Y-dot Pitch set dot pitch in X direction and Y direction. X Dots and Y Dots set dot number in X direction and Y direction. Dot pitch and dot number both decide the size of survey area. Based on different objects, users distribute measuring points according to certain pitch, generally, the two values should be consistent. Specific adjustment steps are as follows:

1. Pressing aorb to select the item needing adjustment 2. PressingENTERto enter into editing or adjusting state. 3. Pressing aorb to adjust digit value. 4. PressingSAVEor ENTERto set current value and exit

from editing and adjusting state. 5. PressingMENUto go back to menu selection state and

continuing other menu operation. 6. PressingBACKto go back to previous state.

Single electrode dot pitch in X direction and Y direction is 1100(cm) and double electrode dot pitch in X direction is fixed 20cm,in Y direction is 1100cm. Range of single-electrode and double electrode measuring points is 118 in X axis and 113 in Y direction. 3.5.2.5 Rust test interface Pressing aorbin main menu to move cursor to Start Scan


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option, pressingENTERto enter into the measuring interface as shown in figure3-43. The measuring interface is composed by result display area and parameter area. The top of screen is the result display area with legend to show measuring result of every measuring point and different legends represent different potentials. Users can set under Icon menu, operation please refer to in 3.5.2.3. The lower part is parameter area, displaying current ordinate, object No., current tested potential and test direction.

Figure 3-43 Rust test interface

3.5.2.6 Data display Pressing aorb in main menu to shift cursor to Data Display option, pressingENTERto enter into data display interface. The left side of screen will display list of tested objects, right side with statistical results of corresponding test data as shown in figure3-44. Object No. displays in inverse order, that is, the last tested object will display first.

Figure 3-44 Data display


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The statistics include: 1) Test methodtest method used in this data measurement 2) Number of datanumber of measuring points stored in the object

No. 3) Dot pitchesmeasuring points space in X direction and Y

direction of this object. 4) Average valuethe average value of all measuring points

potentials within this object. 5) Corrosion statisticsit is statistics about relative corrosion of this

object. This statistic is based on (GB/T50344-2004) and YBJ222-90 of the Metallurgy Institute, please see appendix for specific requirements.

Pressing aorb to shift cursor and select different object No., statistics in the right side will be updated simultaneously. Pressing ENTER to display detailed test data within this object with charts, at that time, pressing a,b,_,`keys to move cursor, potential value of current cursor will be displayed in the right bottom corner. Pressing BACKto go back to previous data display interface and pressing MENUorBACKto go back to main menu. 3.5.2.7 Data deletion Pressing aorb key in main menu to move cursor to Delete Data option, and pressing ENTER to enter into deletion confirmation interface as shown in figure 33-45(A).At that time, instrument needs users to confirm data deletion or not, pressing ENTERto delete data as shown in figure3-45(B). After data is deleted, it will go back to main menu automatically. If pressingBACKin figure3-45(A), it will cancel data deletion and go back to main menu.


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(A) (B) Figure 3-45 Data deletion

Suggestion: Data deletion is unrecoverable, it is recommend that users firstly make sure all the data within instrument have already been transmitted to computer, then delete data.


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Chapter 4 Guide of quick operation

4.1 Rebar test

4.1.1 On-site preparation

Before the start of test, grind or polish the tested object first. Uneven surface of objects will affect test results. Try best to keep the surface of objects even, it is conducive to sensor sliding on component surface.

4.1.2 To connect sensor to host

To insert one end plug (in black) of signal wire to the left side corresponding socket of host, rotating clockwise and locking. Then insert the other end plug into sensor socket and lock in the same manner (see figure 4-1 for connection diagram)

Figure 4-1 Connect rebar sensor with host


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Figure 4-2 Connect rebar sensor

Note: Signal wire direction is no difference. (See figure4-2).

4.1.3 Starting test

Pressing key, host starts to work. The screen displays the boot interface, about 2 seconds, it will enter into main menu interface automatically. Select Rebar Test and press Enterto enter into test interface. Please see chapter3.4 for specific operation.

4.1.4 Data transmission

After finishing the test, transmit the testing data into U-disk, then into computer for analysis by software. Please see chapter 3.2 for specific operation.

4.1.5 Data analysis and process

The Data processing of multifunctional rebar detector software provides more advanced data processing function. Please see Manual of data process software of rebar test for related parts.


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4.1.6 Data deletion

After analyzing all the data and confirm no problem, the data within instrument can be deleted. Pressing aorb key in Rebar Test menu to select Delete Data, pressing ENTERto select it , the data deletion interface will occur, pressing ENTERagain to delete all the data within instrument. Please see chapter 3.4.5 for specific operation.

4.2 Rust test

4.2.1 Preparation before test

4.2.1.1 Prepare the corrosion electrode

(a)State in case

(b)State for use

Figure 4-3 Electrode 1. Mixing liquid

When electrode is produced, both ends have rubber sleeve, as shown in fig.4-3a. The bottom rubber sleeve is used to protect


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tube. Upper rubber sleeve is used to protect electrode, Q9 socket transmit electricity. Unscrew the upper rubber sleeve and Q9socket, and inject copper sulfate solution into the electrode. While used, firstly remove bottom rubber sleeve and then remove the upper rubber sleeve (one end of Q9): that is to hold upper rubber sleeve of copper sulfate electrode and PMMA tube with two hands, rotating rubber sleeve clockwise and separating electrode upper and PMMA tube. Placing 20 grams copper sulfate into PMMA tube and pouring about 4/5 distilled water to PMMA tube and equipping upper part of electrode to PMMA tube. Shaking electrode appropriately, making copper sulfate solution reaches saturation, small amount of copper sulfate particle exists.

2. To install bottom bracket of electrode, Firstly soak sponge with distilled water, when soften completely, screwing to the electrode bottom, at the same time, keep a good contact between sponge and bottom white ceramic chip. The electrode installed for use is shown in fig.4-3b.

Attention: the electrode can use sustainable after one time mixing liquid until the remaining liquid inadequate then reequipped with liquid or supplemented.

4.2.1.2 To determine survey area It is better to select area of structural concrete with rebar corrosion signs or possibility of corrosion, the area should be less than 5m5m.

4.2.1.3 To distribute measuring points 1. Distributing measuring lines on the surface of object to be tested, measuring lines in X direction and Y direction constitutes a square grid, see fig.4-4 and fig.4-5. The crossing point of measuring lines is the measuring points. Generally, space of single-electrode measuring points is set to 10cm50cm. Space of double-electrode measuring


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points is fixed 20cm. Every survey area should distribute 30-50 measuring points and distance between measuring point and edge of object should be greater than 4cm.

Figure 4-4 Distribution of measuring point (Single electrode)

Figure 4-5 Distribution of measuring point (Double electrode)

2. Please see 4.3 explanations of on-site notes to deal with survey area appropriately. 4.2.1.4 To connect cable

If testing with single-electrode method, it is necessary to connect copper sulfate electrode to corrosion sensor port of instrument with signal wires, and then chisel concrete in an appropriate position to expose rebar. The surface of rebar should remove rust or dirt to guarantee effective connection between wire and rebar, and then clip rebar with the clamp of earth wire, see fig.4-6.


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Figure 4-6 Single electrode connection

Figure 4-7 Double electrode connection

If testing with double-electrode method, it is necessary to install the two copper sulfate electrode on the double-electrode support and connect the two electrodes to corrosion sensor port of instrument with double-electrode signal wire, see fig.4-7.

4.2.2 Starting rust test

1. To start up the instrument and enter into Method, Icon Scan Area under Rust Test respectively. Select test method and icon, set number, dot pitch and number of measuring points etc and then select Start Scan to test interface.


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2. According to requirement, pressing ENTER to shift measuring direction.

3. To place electrode on measuring points and observe potential value display. When the value is stable, pressingSAVEto store

Manual of R800 R630A C310A

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