Inductive conductivity transmitter CTI-Junior B 20

Inductiveconductivity transmitter

CTI-Junior

B 20.2754Operating Instructions

12.00 / 00389007

B Please read these Operating Instructions before commissioning the instru-ment. Keep these operating instructions in a place which is accessible to allusers at all times. Please assist us to improve these operating instructions.Your suggestions will be welcome.

H All necessary settings are described in this manual. If, however, any difficultiesshould arise during commissioning, you are asked not to carry out any unau-thorized manipulations on the unit.Your could endanger your rights under the instrument warranty!Please contact the nearest subsidiary or the main factory in such a case.

EWhen returning chassis, modules or components, the regulations ofEN 100 015 “Protection of electrostatically sensitive components” must beobserved. Use only the appropriate ESD packaging for transport.Please note that we cannot accept any liability for damage caused by ESD(electrostatic discharge).

Contents

1 Introduction 3

1.1 Typographical conventions ......................................................................... 31.1.1 Warnings ........................................................................................................ 31.1.2 Note signs ...................................................................................................... 3

1.2 Instrument description ................................................................................ 4

2 Identifying the instrument version 5

2.1 Nameplate ..................................................................................................... 5

2.2 Type designation .......................................................................................... 6

3 Settings inside the instrument 7

3.1 Defining the range ........................................................................................ 7

3.2 Temperature compensation (TC) .............................................................. 103.2.1 Adjusting the TC ........................................................................................... 11

4 Installation 12

4.1 Location ...................................................................................................... 12

5 Electrical connection 14

5.1 Connection diagrams ................................................................................. 14

6 What to do if? 15

6.1 Trouble-shooting ........................................................................................ 15

6.2 Testing the instrument ............................................................................... 156.2.1 Testing with ohmic resistance (resistance loop) ........................................... 166.2.2 Testing with a reference liquid ...................................................................... 186.2.3 Testing with a reference device .................................................................... 196.2.4 Testing the temperature transmitter ............................................................. 20

7 Appendix 21

7.1 Technical data ............................................................................................. 21

7.2 Dimensions ................................................................................................. 23

7.3 Instrument combination ............................................................................ 25

5

1 Introduction

1.1 Typographical conventions

1.1.1 Warnings

VDangerThis symbol is used where there may be danger to personnel if the instruc-tions are disregarded or not followed accurately.

CautionThis symbol is used where there may be damage to equipment or data if theinstructions are disregarded or not followed accurately.

ECautionThis symbol is used if precautions must be taken when handling electrostati-cally sensitive components.

1.1.2 Note signs

HNoteThis symbol is used to draw your special attention to a remark.

vReferenceThis symbol refers to additional information in other manuals, chapters orsections.

abc1FootnoteFootnotes are comments that refer to specific parts of the text. Footnotesconsist of two parts:1) The marking in the text, arranged as continuous superscript numbers.2) The footnote text, at the bottom of the page, in a smaller typeface than the

main text, and preceded by a number.

h

ActionThis symbol marks the description of a required action.The individual steps are indicated by an asterisk, e. g.

h Unscrew crosspoint screw

h Remove case cover

A

1 Introduction

6

1.2 Instrument description

Transmitter The transmitter for measuring the specific conductivity has been designed foruse on site. The sturdy housing (IP67 protection) in glass-fiber reinforcedpolyamide protects the electronics and the electrical connections from corro-sive environmental influences. A transmitter for conductivity (4 — 20mA outputsignal) is provided as a standard feature. Optionally, the temperature can bemade available as a 0 — 10V output signal or as a resistance value (Pt100 in2-wire circuit).

Processconnections

The transmitter is available with different process connections for a variety ofapplications. The version with a PVC conductivity cell is supplied with a teeDN32. If not otherwise specified, the male threads and process connectionsare in stainless steel V2A 1.4301 (PP or PVDF are available to special order).

Typicalapplications

The transmitter is used in liquids where deposits of dirt, oil, grease or gypsum/lime precipitates are to be expected.

PVC cell PVDF or PEEK cell

Desalination plantWater and waste-watermanagement, e.g. car wash and service water monitoringLeakage indicationRinsing water monitoring in electro-plating plants, pcb production Phase separation(e.g. oil/water)

Food, beverages andpharmaceutical industriesProduct monitoring (phase separa-tion product/product mixture/water) in the beverage industry, breweries, and dairiesControlConcentration control for acids and caustic solutions, e.g. in electro-plating and process chemistryDosing of chemicals

7

2 Identifying the instrument version

2.1 Nameplate

Position

The nameplate is fixed to the housing, with an additional one inside the cover.

Type designation

2 Identifying the instrument version

8

2.2 Type designation

Typedesignation

* extra codes can be combined, listed in sequence and separated by commas1 only with process connection -6912 not with process connection -6913 not with extra code /2634 not with extra code /262

(1) (2) (3)

202754/ .. - ... / ...

Code (1) Basic type extensions

01 range 0 — 1 mS/cm1






07 range 0 — 100 mS/cm1

08 range 0 — 200 mS/cm1

09 range 0 — 500 mS/cm1

10 range 0 — 1/2/5 mS/cm, can be switched internally2



Code (2) Process connection

108 male thread 1½" pipe A (cell material PVDF)

607 screwed pipe joint DN50, DIN 11851 (cell material PVDF)

617 clamp connection 2½" (cell material PVDF)

691 tee DN32 (cell material PVC)

Code (3) Extra codes*

000 no extra code

767 cell material PEEK 2

262 measurement output temperature 0 — 10 V 3

263 Pt100, connected to terminal strip4

9

3 Settings inside the instrument

3.1 Defining the range

Open cover

h Unscrew the 4 crosspoint screws (1).

h Remove cover (2).

H Make sure the seal is clean and properly seated when closing.

(1)

(1)

(1)

(1)

( 2 )


10

Procedure Range definition

h The active range is selected by using the rotary switch (2) “Range”.

Instrument versions 01 — 09 with process connection /691 have a fixed range.Range switching is not possible.

Evaluationtable

Examples forsettings

RangesExample 1:202754/10-607/000Range switching is possible.

Ranges:0—5 mS/cm0—2 mS/cm0—1 mS/cm

Instrumentversion

Range

100 — 1 mS/cm0 — 2 mS/cm0 — 5 mS/cm

110 — 10 mS/cm0 — 20 mS/cm0 — 50 mS/cm

120 — 100 mS/cm0 — 200 mS/cm0 — 500 mS/cm

Selectable ranges and type of temperatureoutput are marked on the field.

( 1 ) = TC potentiometer( 2 ) = rotary switch

11


Examples forsettings Example 2:

202754/05-691/000Range switching isnot possible.

Range:0—20 mS/cm

Temperature output

Example 3:202754/11-607/262Temperature output 0—10 V DC

Ranges:0—50 mS/cm0—20 mS/cm0—10 mS/cm


12

3.2 Temperature compensation (TC)

General The measuring cell incorporates a Pt100 temperature sensor for temperaturemeasurement and compensation. The conductivity of a liquid depends on itscomposition and on the temperature. Even if the composition remains the sa-me, the actual conductivity changes with temperature. Temperature compen-sation (referred to as TC below) corrects the actual conductivity that is presentto the internationally recognized 25°C reference temperature. Because thetemperature coefficient is medium-specific, the correct temperature coeffie-cient has to be set on the instrument during commissioning. This temperaturecoefficient applies to the composition of a liquid. On instruments with extracode /263 or without temperature compensation, temperature compensationis not possible. In this case, it has to be carried out by the indicator connectedto it.

Preparation Electrical connection:

h Connect supply voltage24 V DC

h Connect indicator ormultimeter with a range4 — 20 mA

h Check range(exception: process connection /691)

v Chapter 3.1 “Defining the range”

Medium:

h Immerse cell in a vessel filled withthe liquid, or,with process connection /691, leavethe cell in the tee and fill the teewith the liquid.

H The distance to the walls of thevessel must not be less than5 mm, otherwise the measure-ment will be inaccurate. An eventemperature distribution isequally important.Keep the cell steady whilemeasuring.

13


3.2.1 Adjusting the TC

Adjustment

h Set the TC potentiometer ( 1 ) to 0 (left stop)

h Warm the liquid to 25°C

h Note down the display value (indicator or multimeter)

h Warm (cool down) the liquid to the future operating temperature

h Set the value that was noted previously, using the TC potentiometer

H The temperature coefficient has been set correctly.

HWith extra code /262, temperature compensation is onlypossible externally, in a suitable indicator unit.

( 1 )

14

4 Installation

4.1 Location

Basics The location must be readily accessible and largely free from vibration. Thepermissible ambient temperature must be observed (note possible heat radia-tion).v Chapter 7.1 “Technical data”

Celltee DN32

On units with process connection /691, the tee included in the delivery has tobe integrated into the piping.

Cell in PVDF or PEEK

The unit can be fitted in a DN65 pipe or larger, by means of a tee.

Operatingposition

The operating position is generally unrestricted. However, it is essential thatthere is a continuous exchange of the liquid in the flow-through channel ( 3 ).The probe body ( 1 ) must be completely enveloped by the liquid. The distanceto the walls ( 2 ) should not be less than 5 mm, to avoid measurement errors.

Vertical mountingWherever possible, the inductive conductivity transmitter should be installed invertical pipelines, to avoid measurement errors caused by gas bubbles. Theflow-through direction must be from the bottom to the top. The housingshould be rotated so that the electrical connections point downwards.

VThe installation has to be de-pressurized before assembly ordisassembly!Depending on the application, any leakage may be corrosive!The instrument is not suitable for installation in areas with anexplosion hazard!

(1)

(2)

(3)

Example: Version “Milk cone, DN50“

15

4 Installation

Horizontal mounting

If the inductive conductivity transmitter has to be installed in horizontal pipe-lines, it should be mounted from below, to avoid measurement errors causedby gas bubbles.

Corner mounting

For this type of mounting, the orientation of the flow-through channel is unim-portant. It is recommended that the housing is rotated so that the electricalconnections point downwards.

preferredflow direction

16

5.1 Connection diagrams

Valid for allinstrumentversions

standard with extra code /262 with extra code /263

Supply Option Terminal Option TerminalSupply24 V DC (+ ) (-)

12

12

Conductivity output (+ )4 — 20 mA (-)

34

34

Temperature output (+ )0 — 10 V (-)

/262 56

/263Pt100

56

Note:Terminals 2, 4 and 6 are internally linked

Note:Terminals 2 and 4 are internally linked

5 Electrical connection

17

6 What to do if?

6.1 Trouble-shooting

Possiblefaults

t

6.2 Testing the instrument

General The instrument is factory-calibrated and does not require any maintenance. If,however, there are measurement deviations whose cause is unknown, then thetransmitter can be tested as follows.

Problem Possible cause Measure

nocurrent /voltage output

no supply voltage check supply voltage,check terminals

current output 4 mA sensor not immersed in medium;container leveltoo low

fill container

through-flow fittingblocked

clean through-flow fitting

sensor faulty v Chapter 6.2 “Testing the instrument”

wrong orfluctuatingcurrent output

sensor not sufficiently immersed

fill container

not mixed thoroughly ensure thoroughmixing;make sure that sensoris completely surrounded by at least 5 mm of liquid in all directions

gas bubbles check installation site,v Chapter 4.1

“Location”

A Do not make adjustments to potentiometers (factory setting)!The only adjustment permitted is the TC setting.


6 What to do if?

18

6.2.1 Testing with ohmic resistance (resistance loop)

Position ofresistance loop

h Guide the wire through the cell (see diagram)

h Connect resistor R to wire

Calculation ofresistance

Formula for calculating the resistance of the resistance loop:

Note: 1 mS/cm = 1·10-3 S/cm

To obtain a display of 10 mS/cm, the resistance loop must have a resistance of545 Ohm.

A Touching the sensitive portion of the cell or bringing it into contactwith anything during calibration will lead to measurement errors.

R

Form of cell Cell constant K

T-shaped 5.45 1/cm

Process connection /691tee DN32

6.70 1/cm

R =K R = resistance of resistance loop

Lf K = cell constant

Lf = desired display in S/cm

Example =T-shaped cell

desired display 10mS/cm

R =5.45 1/cm

= 545 Ω10·10-3 S/cm

19

6 What to do if?

Carrying outthe test

h Calculate the test resistances according to the formula above.

h Connect up the instrument,

v Chapter 5 “Electrical connection”.

h Select range according to the test resistances,

v Chapter 3.1 “Defining the range”.

h Set TC to 0%/°C


h Attach the resistance loop according to diagram.

The output and, if applicable, the display of the instrument, or of theindicator connected to it, must correspond to the calculated value.The actual conductivity at the cell can be calculated from the current valueof the measurement output as follows:

Conductivity at the cell =Meas. output [mA] — 4 mA

• Range end16 mA

6 What to do if?

20

6.2.2 Testing with a reference liquid

Immersion intest solution


h Prepare the conductivity test solution in a vessel of appropriate sizeor, with process connection /691, leave cell in tee and fill tee with the liquid.

v Chapter 3.1 “Defining the range”,

e.g. conductivity test solution with a conductivity of 1.44 mS/cm,12.88 mS/cm or 111.8 mS/cm.



h Select range according to conductivity test solution


h Set TC to 0%/°C

v Chapter 3.2.1 “Adjusting the TC”.

h Immerse cell in vessel and keep it still during measurement.

h The output and, if applicable, the instrument display, or the display of theindicator connected to it, must correspond to the value of the test solution(observe temperature of conductivity test solution).

h The actual conductivity at the cell can be calculated from the current valueof the measurement output as follows:


• Range end16 mA

21

6 What to do if?

6.2.3 Testing with a reference device

Immersion intest solution


h Prepare the conductivity test solution in a vessel of appropriate size,or, with process connection /691, leave the cell in tee and fill tee with theliquid.




h Select range according to test solution


h Set TC to 0%/°C,

v Chapter 3.2.1 “Adjusting the TC”.

h Set TC to 0%/°C, also on the reference device (see operating instructionsfor reference device). If this is not possible, the test liquid has to be tempe-red to the reference temperature of the reference device.

h Immerse the cell to be tested and the cell of the reference device in the ves-sel and keep them still during measurement.

h The output and the display of the instrument to be tested, or the display ofthe indicator connected to it and that of the reference device, must corre-spond to each other, taking into account the permissible instrument errors.

h The actual conductivity at the cell can be calculated from the current valueof the measurement output as follows:


• Range end16 mA

6 What to do if?

22

6.2.4 Testing the temperature transmitter

Calculatingthetemperature atthe sensor

with extra code /262:Only the measurement output of the transmitter can be checked here. Thetemperature probe is integrated in the cell.

h The temperature at the temperature probe can be calculated from thevoltage value of the measurement output as follows:

If, during the check according to 6.2, errors occur that are more significantthan specified in the data sheet, please contact the manufacturer.(Note temperature compensation processes, such as lag, for example.)

with extra code /263:The electrical resistance of the built-in Pt100 temperature probe can be mea-sured here.The basic values can be taken from the IEC 751 standard.Some example values are given below:

Temperature at the probe =Meas. output [ V ]

• 150°C10 V

Temperature [ °C ] Resistance [ Ω ]

0 100.00

25 109.735

50 119.397

100 138.397

150 157.325

H Look out for lead and contact resistances. These will lead to theindication of a resistance value that is too high.

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7 Appendix

7.1 Technical data

Ranges 0 — 1 mS/cm up to 0 — 500 mS/cm depending on the instrument version(basic type extension)

Conductivitytransmitter

v Chapter 2.2 “Type designation”ranges, basic type extension (type code)

Temperaturetransmitter(extra code /262)

Temperatureoutput(extra code /263)

Temperaturecompensation(except forinstruments with extra code /263)

Current output 3-wire circuit, 4—20 mACurrent drawn 100 mA max.Characteristic linearAccuracy ≤ 2% of rangeMax. permissible burden RBmax = 500Ω

Range 0 — 150°CVoltage output 0—10 VCharacteristic linearAccuracy ≤ 2% of rangeMin. permissible burden RBmin ≥ 10 kOhm

Range 0 — 150°CCharacteristic Pt100 as per IEC 751, Class B

Reference temperature 25°CTemperature coefficient 0—3%/°C adjustableCompensation range 0 — 100°C

7 Appendix

24

Measuring cell

Electricaldata

Housing

Material PVC, PVDF, PEEK.Note:

temperature, pressure and medium influence the lifeof the cell

Temperatureof medium

120°C max.,briefly 140°C (sterilization)

with process connection -691 tee DN32:55°C max.

Pressure 10 bar max.

Supply 19 — 30V DCnominally 24V DC

Electrical connection spring-loaded terminal

Housing type glass fiber reinforced polyamidenormally one compression gland (Pg11)

Dimensions in mm Chapter 7.2 “Dimensions”Permisssibleambient temperature

-5 to +70°C

Permissiblestorage temperature

-10 to +85°C

Climatic conditions rel. humidity ≤ 85%, no condensationOperating position anyProtection IP67Weight 2 kg approx.

25

7 Appendix

7.2 Dimensions

Screwed pipe joint DIN 11851

607 screwed pipe joint DN50

Male thread Ø D

108 male thread 1½" pipe 68

Pg11ring nut F DN

Process connection

691 tee DN32

screwed jointDN32

tee DN32

thread

7 Appendix

26

Process connection

617 clamp connection 2½"

Available accessory

for process connection -607Weld-on threaded pipe adaptor DN50DIN 11851

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7 Appendix

7.3 Instrument combination

Wiring example - CTI-JuniorType: 202754/10-607/000

- Switched-mode power supplyType: PS5R-A-24

- Indicator/controller

1817 19

2120

2322

L1(L+) TE

N(L-)

1213

1011

1516

142

1

3

89 7

6 45

CTI-JuniorType: 202754/10-607/000

Indicator/controllerSwitched-mode power supplyType: PS5R-A-24

Inductive conductivity transmitter CTI-Junior B 20

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