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Linear RecordersModel 1201/Model 1202

Operating Instructions

0115-0094 • 2/15/96

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Table of Contents

Safety Information .............................................................................................................................................. 3Warnings ......................................................................................................................................................... 3

Introduction ........................................................................................................................................................ 4Warranty Card................................................................................................................................................. 4Initial Inspection .............................................................................................................................................. 4Return Requests/Inquiries .............................................................................................................................. 4Description ...................................................................................................................................................... 5General ........................................................................................................................................................... 6Servo System ................................................................................................................................................. 6

Specifications ..................................................................................................................................................... 6Chart Drive System ......................................................................................................................................... 7Options............................................................................................................................................................ 7

Setup Procedure ................................................................................................................................................ 8Power Requirements ...................................................................................................................................... 8Chart Paper Installation .................................................................................................................................. 8Pen Installation ............................................................................................................................................. 10Grounding ..................................................................................................................................................... 10Input Signal Connections .............................................................................................................................. 11

Recording Procedure ....................................................................................................................................... 13Manual Paper Advance/Rewind ................................................................................................................... 14

Special Features .............................................................................................................................................. 15Separate Pen Event Marker - Standard ........................................................................................................ 15Remote Chart On/Off - Standard .................................................................................................................. 15Electric Pen Lift - Standard ........................................................................................................................... 15Override Event Marker - Standard ................................................................................................................ 15Remote Chart Programming/TTL - Standard ................................................................................................ 16

Pulse Train Specifications: ........................................................................................................................ 16Paper Tear Off Bar - Standard ...................................................................................................................... 17Forward/Reverse Chart Drive - Standard ..................................................................................................... 17

General Theory ................................................................................................................................................ 18Pen Drive System ......................................................................................................................................... 18Chart Drive System ....................................................................................................................................... 18Dc Power Supply .......................................................................................................................................... 19

Calibration ........................................................................................................................................................ 20Power Supply ................................................................................................................................................ 20Chart Drive System ....................................................................................................................................... 20Pen Drive System ......................................................................................................................................... 20

Operational Tips And Maintenance .................................................................................................................. 26Troubleshooting ............................................................................................................................................... 27

Chart Drive Section ....................................................................................................................................... 27Analog Section .............................................................................................................................................. 28Accessories................................................................................................................................................... 29Replacement Parts ....................................................................................................................................... 29

Parts and Accessories ..................................................................................................................................... 29Ordering Procedures ........................................................................................................................................ 30Wiring Diagram ................................................................................................................................................ 31One Year Limited Warranty.............................................................................................................................. 32

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Safety Information

Your Linear Recorder has been designed withfunction, reliability and safety in mind. It is yourresponsibility to install it in conformance withlocal electrical codes. For safe operation, pleasepay attention to the alert signals throughout themanual.

Warnings

To avoid electrical shock, always:1. Use a properly grounded electrical

outlet of correct voltage and currenthandling capacity.

2. Disconnect from the power supplybefore servicing.

To avoid personal injury:

1. Do not use in the presence offlammable or combustible materials; fireor explosion may result. This devicecontains components which may ignitesuch materials.

2. Refer servicing to qualified personnel.

WarningWarnings alert you to a possibility ofpersonal injury.

CautionCautions alert you to a possibility ofdamage to the equipment.

NoteNotes alert you to pertinent facts andconditions.

Alert Signals

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Introduction

Warranty Card

Please fill in and return the Warranty Registrationcard so we may validate the beginning date ofthe warranty period.

Initial Inspection

The recorder should be inspected for shippingdamage immediately after unpacking. If anydamage is found, please notify the carrier and theBarnstead|Thermolyne Customer ServiceDepartment.

If the recorder fails to operate properly, checkall connections and switch settings and insurethat the plug-in connector is firmly seated inplace. Also check the setup Procedure containedin the manual before calling theBarnstead|Thermolyne Customer ServiceDepartment.

Do not return recorder for warranty servicewithout specific authorization from theBarnstead|Thermolyne Customer ServiceDepartment.

Return Requests/Inquiries

Return requests, service or other inquiries shouldbe made directly to the Barnstead|ThermolyneCustomer Service Department.

To avoid lengthy delays in processing orders orcorrespondence regarding your recorder, pleaseinclude the Model Number, Serial Number,Options and Place of Purchase.

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Description

The Model 1200 Recorder is a multi-rangepotentiometric, null balance servo recorder whichwill provide an accurate, permanent, graphicrecord of the input signal.

This graphic recorder may be used in manydifferent applications in the medical, teaching andindustrial fields where a precision instrument is ofutmost importance.

Measurement of DC voltage, current,temperature and a variety of other variables ismade possible with the use of this recorder.

INTRODUCTION

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Specifications

General

1. Number of Channels: ....... Model 1201 - One; Model 1202 - Two.2. Chart Width: ..................... 200mm Writing Width3. Writing Method: ................ Disposable fiber tipped pen with self contained ink supply4. Accuracy: .......................... Deadband: less than ± 0.1%.

Linearity: less than ± 0.5%.Repeatability: less than ± 0.1%.

5. Zero Adjust: ...................... Continuous + 100% to - 100%6. Power Requirements: ....... 115/230 VAC ± 10%, 50/60 Hz, Single Phase7. Wattage: ........................... Model 1201 - 17.5 watts max

Model 1202 - 22.5 watts max8. Fuse: ................................ 115 VAC - 3AG Slo-Blo 0.3a (2)

230 VAC - 3AG Slo-Blo 0.15a (2)9. Line Filter: ......................... Grounded electrostatically shielded power transformer10. Weight: ............................. Model 1201 - 9 lbs (4.1 Kg)

Model 1202 - 11 lbs (5 Kg)11. Dimensions: ...................... 15" (38.1cm) W (incl. knob) x 4.38" (11.13cm) H x 10.5"

(26.7cm) D12. Accessories Furnished: .... Pen(s); One roll chart paper; Operators Manual; Paper

Feed Spool; Two 0.15a Fuses (230 VAC operation)

Servo System

1. Pen Drive: ......................... Patented (U.S. Patent No. 4,146,828) Pulse ModulatedSystem

2. Input Type: ....................... Single Ended, Floating3. Input Impedance: .............. 2.5 megohms, fixed4. Input Filtering: ................... Filters noise above 3 Hz5. Full Scale Response: ....... Less than 0.25 seconds6. Full Scale Spans: ............. 12, switch selectable:

Ranges ............................. 1mV, 10mV, 100mV, 1V2mV, 20mV, 200mV, 2V5mV, 50mV, 500mV, 5V

7. Overshoot: ........................ None. System critically damped8. Zero Shift Tempco: ........... Less than 0.1% per degree C9. Calibration: ....................... Front panel all ranges (with external reference)10. Overrange Protection: ...... Shutdown approximately 6 seconds after + or - overrange

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11. Event Marker: ................... Electronic override - Approximately ± 4% spike andseparate pen, electric solenoid actuated

12. Pen Lift: ............................ Manual external lever and electric solenoid actuated

Chart Drive System

1. Chart Drive: ...................... Four phase stepper motor.2. Chart Speeds: .................. 16 switch selectable metric:

1, 2, 3, 6, 10, 15, 20 and 30 cm/min and cm/hr.NOTE: Chart speeds are whole number reciprocals to facilitate use in sec/cm and min/cm

ranges.

3. Chart Speed Accuracy: .... Less than ±0.03% error.4. Chart Programming: ......... Contact closure or TTL/CMOS.5. Paper Reverse: ................ External knob and electrical

Options

See “Special Features”, Page 15.

SPECIFICATIONS

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Power Requirements

Recorders are shipped ready to operate on anominal AC voltage of 115VAC. Conversion canbe made to 230VAC by moving a slide switch(inside the instrument) to the proper position andinstalling the correct fuses (0.15a). See Figure 4for access.

Chart Paper Installation

See Figures 1, 2 and 31. Place the REC/STBY switch(es) in the

STBY position.

2. Place the Cm/Min-OFF-Cm/Hr switch inthe OFF position.

3. Turn the power ON and place the pen(s)in the LOAD position using the ZEROcontrol (fully clockwise) and lift thepen(s) with the pen lift lever.

Setup Procedure

The recorder must bedisconnected from the ACpower source and caution mustbe used in removing andreplacing the bottom cover toprevent damage to internalwiring and electroniccomponents.

Note

WarningUse a properly groundedelectrical outlet of correctvoltage and current handlingcapacity.

Disconnect from the powersupply before servicing.

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4. Remove the masking tape from a newroll of paper and make an 8 inch long“V” in the beginning of the paper.

5. Load the chart paper into the rear of therecorder after installing the Paper FeedSpool. (Taped in place on the rear of therecorder).

6. Feed the “V” through the space betweenthe paper hold down and the chassis,and under the Tear-Off bar, using thepaper advance/rewind knob to assistloading.

7. Check for proper hole and slotengagement with the sprockets to insurethat the paper is not cocked. The chartgrids should be parallel with the paperTear-Off bar and the paper should movesmoothly and freely.

SETUP PROCEDURE

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Pen Installation

1. With the pen holder(s) in the LOAD orUP position, remove the cap from theshort nib pen and slide the pen into theholder as far as possible.

2. On two pen models, insert the long nibpen into the upper pen holder in thesame manner. There should be nointerference between the pens.

GroundingFor best performance, the green (or green andyellow) ground wire in the power cord for therecorder and the signal source should share acommon “water pipe” ground. The green (greenand yellow) wire in the power cord is connectedto the recorder ground (chassis), but not to thesignal input. If the signal input does not have athird wire in its power cord, or if the instrument is

Do not connect the PowerGround (PWR GND) terminal(1TB1 or 2TB1) to either theSignal Ground (SIG GND) (-)or the Chassis Ground terminalas damage to the recorder mayoccur.

Caution

SETUP PROCEDURE

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not grounded, connect a wire between therecorder ground terminal and the chassis of thesignal source.

In case of large normal mode signals,particularly 120 Hz, connect the recorder groundterminal to the source of the normal-mode signal,or to the negative (-) recorder input terminal.

Input Signal Connections

See Figure 3.

This instrument requires a DC voltage input.Signal sources with current outputs will require ashunt resistor across the + and - input terminals.Ohms Law may be used to compute the propervalue for a given input range. The formula is:

R = E I

Where: E is the recorder span (range) selectedin Volts, I is the maximum current signal to berecorded in Amps, and R is the resistance of theshunt resistor in Ohms.

1. Electrical connections are made asfollows:Signal source Positive to recorder (+)terminalSignal source Negative to recorder (-)terminal

2. Right hand zero is standard on thisrecorder. However, either right or lefthand zero may be used. (Zero can beswitched electronically at the factory.)

A. Positive going input signals:

SETUP PROCEDURE

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1.For RIGHT hand zero, adjustpen(s) to the right side of the chartwith the zero control(s). The pen(s)will now drive to the left.

2.For LEFT hand zero, adjustpen(s) to the left side of the chartwith the zero control(s). Reversethe input signal connections on therear of the recorder (POSITIVEinput to (-) terminal and NEGATIVEinput to (+) terminal). The pen(s)will now drive to the right. (May benoisy).

B. Negative going input signals:

1.For RIGHT hand zero, adjustpen(s) to the right side of the chartwith the zero control(s). Reversethe input signal connections on therear of the recorder (POSITIVEinput to (-) terminal and NEGATIVEinput to (+) terminal). The pen(s)will now drive to the left. (May benoisy).

2.For LEFT hand zero, adjustpen(s) to the left side of the chartwith the zero control(s). Connectthe signal input with the POSITIVEto (+) and the NEGATIVE to (-).The pen(s) will now drive to theright.

SETUP PROCEDURE

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See Figures 1, 2 and 4.

With chart paper and pen(s) installed and therecorder plugged into the proper AC source(corresponding to the voltage conversion slideswitch inside the recorder), perform the followingsteps for routine recording:

1. Check that the REC/STBY switch(es)are in the STBY position, the power isON, and the input signal is properlyconnected.

2. Set the INPUT RANGE and mV/Vswitch(es) to the desired input range(span).

3. Set the CHART SPEED and CM/MIN-OFF-CM/HR switch to the desiredchart speed.

4. Adjust pen(s) to the proper zero positionusing the ZERO control(s).

5. Set the REC/STBY switch(es) to RECand proceed with your recording.

When switching from one inputrange (span) to another, thepen zero should be checkedand adjusted if necessary.

“OSC OUT” and “CHARTPROG” terminals of Terminalboard 1TB1 (on bottom ofrecorder) must be jumperedtogether, unless remote chartcontrol is used, or the chartdrive will NOT function.

Note

Recording Procedure

Do not use in the presence offlammable or combustiblematerials; fire or explosion mayresult. This device containscomponents which may ignitesuch materials.

Warning

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Manual Paper Advance/Rewind

The paper may be manually positioned asdesired at any time using the advance/rewindknob on the right side of the recorder. Forelectrically reversing the chart see page 17.

RECORDING PROCEDURE

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Separate Pen Event Marker -StandardUses a separate pen assembly to provide a stepmark at the left edge of the chart when a contactclosure is made between “EVENT MARKER” and“SIG GND” of 1TB1 on the bottom panel.

Remote Chart On/Off - Standard

Provides the ability to turn the chart on and offfrom a remote location when a contact closure ismade or broken between “OSC OUT” and“CHART PROG” of 1TB1 on the bottom panel.

Electric Pen Lift - Standard

Raises the pen(s) off the chart when a contactclosure is made between “PEN LIFT” and “SIGGND” of 1TB1 on the bottom panel.

Override Event Marker -StandardProduces approximately a ± 4% “glitch” in theanalog pen trace when a contact closure is madebetween “OVERRIDE EVENT” and “SIG GND” of1TB1 (Lower Pen) and of 2TB1 (Upper Pen).

Special Features

The jumper between “OSCOUT” and “CHART PROG”must be removed for remoteoperation and reinstalled fornormal operation.

Note

Do not connect to “PWR GND”terminal as damage may occur.

Note

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The jumper between “CHARTPROG” and “OSC OUT” mustbe removed for remoteprogramming.

Note

Change of external frequencyaffects all selector speeds bythe same factor.

Note

If the pulse train ground(common) is the same as theanalog (signal) ground(common), contact FactoryCustomer Service.

Note

SPECIAL FEATURES

Remote Chart Programming/TTL- StandardThe recorder chart drive system is designed tooperate from an external frequency source,including TTL levels. The chart can be run at timerates other than those built into the recorder. Thismode can be obtained by applying a pulse train(see below) to the “CHART PROG” and “PWRGND” terminals of 1TB1 on the bottom of therecorder.

Pulse Train Specifications:0 (low) state voltage is +0.5 Volts or less1 (high) state voltage is +5 to +15 Volts maximumMinimum pulse width is 100 microseconds

Chart Speed Formula:Chart Speed = F 250HzF = External frequency in HzS = Selected chart speedWhen the external frequency is set to 250 Hz,

the chart drive will run at speeds marked on thefront panel selector switch.

If the external frequency is decreased by 10%of the standard 250 Hz rate, the actual chartspeed will be 10% slower than the setting on thefront panel selector switch.EXAMPLE :

The selector is set at 30 Cm/Min and theexternal frequency is changed to 225 Hz(a 10% decrease). The chart will nowrun at 27 Cm/Min.

The recommended maximum chart speed forstart-stop operation is 30 Cm/Min. If thefrequency is “swept” (no start-up), it is possible to

X S

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run faster than 30 Cm/Min; however, sweep ratesmust be gradual enough to assure accuratemechanical tracking.

Paper Tear Off Bar - Standard

Removable clear plastic tear-off bar.To Remove: Pull UP snap-lock at each end of

bar and remove.To Install: Insert tabs in holes in platen and

press snap-locks DOWN.

Forward/Reverse Chart Drive -StandardAllows remote forward and reverse chart drive

Forward: Pin 8 of 1A1-TB1 openReverse: Pin 8 jumpered to Pin 1 (PWR GND)

of 1A1-TB1

SPECIAL FEATURES

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The DC input signal to the recorder is firstfiltered, then amplified by the preamplifier to alevel which is less susceptible to noise andinterference. This conditioned signal is thenapplied to the pulse servo amplifier whichcontinuously compares it to the feedback signaldeveloped by the servo potentiometer.

The difference between these two signals is apositive or negative error signal that is amplifiedand used to drive the servo motor, which iscoupled to the servo potentiometer, in a directionas to reduce the error signal to zero. Since therecorder pen is mechanically coupled to theservo motor and servo potentiometer, its positionon the chart represents an accurate andcontinuous record of the input signal (See Figure5).

Pen Drive System

A DC servo motor is used to control the servopotentiometer and recorder pen by means of agear driven servo drum assembly. The pen isattached to a drive cable which is wrappedaround and secured to the drum. As the drumrotates, the pen is moved across the chartproportionately to the amount of drum rotation.

This recorder uses Linear’s patented pulsemodulated servo to achieve greater accuracy,linearity and less deadband than conventionallydriven recorders. (U.S. Patent No. 4,146,828).

Chart Drive System

In this simple, reliable system, an internal crystaloscillator generates pulses which are divided byintegrated circuit logic. The chart speed switch

General Theory

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merely selects the appropriate pulse rate to drivethe stepper motor at the desired speed. (Thecrystal frequency is not a function of linefrequency, and chart speeds are thereforecompletely independent.)

Dc Power Supply

AC line voltage is reduced by stepdowntransformers and converted to DC by solid staterectifiers and regulators. A stable DC voltage,generated by a voltage reference IC, is used as areference for the servo potentiometer.

GENERAL THEORY

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This recorder is designed to be simple, reliable,easy to maintain and repair. Therefore, theprocedure presented here will be as simple, clearand brief as possible. For special problems, werecommend that you contact your localrepresentative or the factory service department.

Power Supply

There are no calibration adjustments in the powersupply.

Chart Drive System

The chart drive system has no calibrationadjustments.

Pen Drive System

The calibration covered in this section must beperformed by a qualified technician. Thetechnician must be aware of voltages which maycause an electrical shock.

1. Preliminary setup (See Figures 1, 2, 3, 4And 6)

A. POWER switch to OFF.

B. REC/STBY switch to STBY.

C. mV/V switch to V.

D. INPUT RANGE (Span) switch to 5.

E. Chart MIN/OFF/HR switch to OFF.

Calibration

Procedure given is for a singlepen recorder. Calibration ofdual channel models isidentical except proceduremust be duplicated for secondchannel.

Note

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F. CHART SPEED switch to 10.

G. Remove bottom cover retainingscrews (4), to allow access to thecalibration adjustments. (SeeFigure 4)

H. Check that the jumper is installedbetween CHART PROG and OSCOUT terminals on 1TB1 on bottomcover.

2. Warm-up Procedure

A. Step 1, Preliminary setup, shouldbe completed prior to beginning thewarm-up procedure.

B. Install paper and pen(s) if notpreviously done.

C. Connect power cord to suitablepower source and turn recorderON.

CALIBRATION

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D. Allow a minimum warm-up time of30 minutes before proceeding withcalibration.

E. Set pen to DOWN with pen lever.

F. Adjust pen to approximatelymid-scale using the ZERO control.

G. Set chart MIN/OFF/HR switch toMIN.

3. Gain (See Figure 4) The gainadjustment controls the servo loop gain,or “deadband”, of the recorder. If set toohigh, the pen will “buzz”. If set too low,the pen will be sluggish.

A. Adjust the GAIN control (R-14) onthe servo PCB clockwise until thepen Buzzes”, then back offcounterclockwise until the “buzzing”just stops plus 1/8 turn.

B. Recheck the adjustment by movingthe pen over the full scale using theZERO control. If the pen “buzzes”at any point, turn the GAIN controlcounterclockwise until the “buzzing”stops.

4. Offset (See Figure 6) This adjustmentreduces the zero shift between inputranges (spans) to a minimum value.

A. Perform Steps 1, 2 and 3 of theCalibration Procedure beforemaking the Offset adjustments.

B. Set the REC/STBY switch to STBY.

C. Set the mV/V switch to mV.

CALIBRATION

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D. Set the pen to 50% on the chartusing the ZERO control.

E. Set the INPUT RANGE switch to 1MV.

F. Return the pen to the setting in step“E” (50%) with the Eo (R-15) pot onthe Control Panel PCB.

G. Set the mV/V switch to V.

H. Reset the pen to the setting in step“G” (50%) with the Io (R-6) pot onthe Control Panel PCB.

I. Set the INPUT RANGE switch to 5V.

J. Repeat steps “D” through “J” untilminimum (±0.5% maximum) penmovement is achieved.

K Set the mV/V switch to mV.

L Set the INPUT RANGE switch to 1MV.

M. Set the pen to zero on the chartwith the ZERO control.

5. Span (Range) Calibration (See Figures1, 2, 3, 4 and 6.)

This procedure provides adjustment ofthe recorder so that a calibrated fullscale input signal will move the pen thefull width of the chart.

CALIBRATION

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A. Steps 1 through 4 of the CalibrationProcedure must be performedbefore range calibration can beaccomplished.

B. Connect a 0.1% accuracy DCmillivolt source to the (+) and (-)signal input terminals on the rearpanel.

C. Set the DC millivolt source to 0millivolts ±0.1%.

D. Set the REC/STBY switch to REC.

E. Reset the pen to zero ±0.1% withthe ZERO control.

F. Input a 1 mV ±0.1% signal.

G. Adjust the CAL pot (R-26) on theFront Panel for a pen setting of100% ±0.1% on the chart.

H. Set the mV/V switch to V.

I. Set the INPUT RANGE switch to.1V.

J. Set the DC millivolt source to 0millivolts ±0.1%.

K. Reset the pen to zero ±0.1% withthe ZERO control.

L Input a 100mV ±0.1% signal andadjust R-4 on the Control Panel for100% ±0.1% on the chart. (SeeFigure 6)

CALIBRATION

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M. Check all other input ranges withthe appropriate inputs to insurerange tracking calibration of ±0.5%

N. Set the REC/STBY switch to STBY.

O. Turn the recorder OFF anddisconnect the power cord from thepower source.

P. Disconnect the DC millivolt sourcefrom the (+) and (-) input terminals.

Q. Carefully reinstall the bottom coveron the recorder.

The recorder is now calibrated and ready fornormal recording.

CALIBRATION

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Operational Tips AndMaintenance

Chart paper and pens have been carefullymatched for optimum writing and minimum“bleed”. Substitutions could cause improperwriting. Keep pen tips covered when not in use toprolong writing life.

Allow recorder to warm-up for about 30minutes if high accuracy/stability recording isdesired.

Firm tension on paper roll and correctalignment of the chart paper holes on thesprocket teeth are required for proper chart feed.

The exterior surfaces of the recorder should becleaned periodically by wiping with a soft dampcloth. Water may be used to remove ink, etc.;however, solvents should NOT be used as theymay damage or destroy the finish.

If the pen is left uncapped forlong periods and dries out, itmay be revitalized by dipping inwater for a few seconds.

Note

WarningDisconnect from the powersupply before servicing.

Refer servicing to qualifiedpersonnel.

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Troubleshooting

The modularity and simplicity of this recorder make it possible to isolate the problem area inmany cases. Once you have done this, a quick call to your local representative or dealeroffice will bring you needed advice or replacement parts.

While it is impossible to think of every problem possibility, the following chart will give yousuggestions on how to solve the most common recorder problems.

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Chart Drive Section

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Analog Section

TROUBLESHOOTING

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Parts and Accessories

Accessories

Description Part No.Chart Paper

Paper, Roll, 200mm Chart x 25 Meter Length 0100-0026-06Pens

Long Nib, Black (1202 Only) 0100-0111-06Long Nib, Red (1202 Only) 0100-0110-06Long Nib, Blue (1202 Only) 0100-0109-06Short Nib, Black 0100-0107-06Short Nib, Red 0100-0106-06Short Nib, Blue 0100-0105-06

Manual, Instruction (Additional Copies) 0115-0094

Replacement Parts

Pulse Servo PCB Assembly (Upper Pen) (1202 Only) 9816-0038Pulse Servo PCB Assembly (Lower Pen) 9816-0060Control Panel PCB Assembly - Model 1202 9814-0039Control Panel PCB Assembly - Model 1201 9814-0038Cable, Pen Drive 6030-0001Fuse, 3AG, 0.3a Slo-Blo (115 VAC) 5120-0006Fuse, 3AG, 0.15a Slo-Blo (230 VAC) 5120-0007Potentiometer, Servo (Rebalance) 4750-0037Motor, Chart Drive Assembly (Without Gear) 9501-3255Motor, Servo Drive Assembly (Without Gear Assembly) 9501-2156

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Ordering Procedures

Please refer to the Specification Plate for the completemodel number, serial number, and series number whenrequesting service, replacement parts or in anycorrespondence concerning this unit.

All parts listed herein may be ordered from theBarnstead|Thermolyne dealer from whom you purchasedthis unit or can be obtained promptly from the factory.When service or replacement parts are needed we askthat you check first with your dealer. If the dealer cannothandle your request, then contact our Customer ServiceDepartment at 319-556-2241 or 800-553-0039.

Prior to returning any materials to Barnstead|ThermolyneCorp., please contact our Customer Service Departmentfor a “Return Goods Authorization” number (RGA).Material Returned without an RGA number will bereturned.

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Wiring Diagram

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Barnstead|Thermolyne Corporation warrants that if a product manufactured by Barnstead|Thermolyne andsold by it within the continental United States or Canada proves to be defective in material or construction, itwill provide you, without charge, for a period of ninety (90) days, the labor, and a period of one (1) year, theparts, necessary to remedy any such defect. Outside the continental United States and Canada, the warrantyprovides, for one (1) year, the parts necessary to remedy any such defect. The warranty period shallcommence either six (6) months following the date the product is sold by Barnstead|Thermolyne or on thedate it is purchased by the original retail consumer, whichever date occurs first.

All warranty inspections and repairs must be performed by and parts obtained from an authorizedBarnstead|Thermolyne dealer or Barnstead|Thermolyne (at its own discretion). Heating elements, however,because of their susceptibility to overheating and contamination, must be returned to our factory, and if, uponinspection, it is concluded that failure is not due to excessive high temperature or contamination, warrantyreplacement will be provided by Barnstead|Thermolyne . The name of the authorized Barnstead|Thermolynedealer nearest you may be obtained by calling 1-800-446-6060 (319-556-2241) or writing to:

Barnstead|ThermolyneP.O. Box 797

2555 Kerper BoulevardDubuque, IA 52004-0797

USAFAX: (319) 589-0516

E-MAIL ADDRESS: mkt@barnstead.com

Barnstead|Thermolyne’s sole obligation with respect to its product shall be to repair or (at its own discretion)replace the product. Under no circumstances shall it be liable for incidental or consequential damage.

THE WARRANTY STATED HEREIN IS THE SOLE WARRANTY APPLICABLE TO Barnstead|ThermolynePRODUCTS. Barnstead|Thermolyne EXPRESSLY DISCLAIMS ANY AND ALL OTHER WARRANTIES,EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR USE.

One Year Limited Warranty