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10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • [email protected] 

840A, 845, 850, 855 

 

 

 

Digital Temperature Calibrator - Thermometer

 

MODEL 840A, 845, 850, 855 

 

 

    

 

 

 

 

 

 

This owner’s manual was as current as possible when this product was manufactured. However, 

products are constantly being updated and improved. Because of this, some differences may occur 

between the description in this manual and the product you received. 

 

 

Instruction Manual 

PN# 840A-901-01CD 

Publication Date: November 2019 

REV. M 

Summary of Contents for 840A

Page 1: ...840A 845 850 855 This owner s manual was as current as possible when this product was manufactured However products are constantly being updated and improved Because of this some differences may occu...

Page 2: ...eter Mode Operation RTD Thermistor Ohms 12 5 Data Logging Recall 14 6 Calibrator Mode Operation Thermocouples 16 7 Calibrator Mode Operation RTD Thermistor Ohms 17 8 Storage and Recall of Calibrator S...

Page 3: ...OUTPUTS THERMOCOUPLE Miniature TC jack RTD OHMS THERMISTOR T series instrumentation connector THERMOCOUPLE TYPES K J T E N B R S G C D RTD TYPES 100 platinum 0 00385 1000 platinum 0 00385 THERMISTOR...

Page 4: ...9999 9 200 A 99999 50 A THERMISTOR T 113 F 50 A T 113 F 2mA CALIBRATOR MODE OUTPUT LOAD THERMOCOUPLES 500 min CALIBRATOR MODE EXCITATION CURRENTS 100 RTD 0 5 1mA 0 1 2mA typ 1000 RTD 50 100 A 10 200...

Page 5: ...BAT Low Battery OPEN Open Input Thermocouple RTD or Thermistor E 1 momentary Invalid Keypad Entry E 2 momentary Ramp Function Not Installed HI Temperature Reading or Keypad Entry Exceeds Rating LO Tem...

Page 6: ...E N B R S G C D Thermocouples ACCURACY 18 C to 28 C ambient 2 years K J T E N 0 5 F rdg 50 F 1 0 F rdg 50 F B R S G C D 1 7 F TEMPERATURE COEFFICIENT From 0 C to 18 C and 28 C to 50 C K J T E N 0 002...

Page 7: ...LCD includes annunciators for operating modes Up to 11 thermocouple types 2 RTD types and thermistor 1 or 0 1 resolution over temperature range of each sensor F and C scales Reading hold mode 10 memo...

Page 8: ...dangers that could result in personal injury or death The CAUTION used in this manual explains hazards that could damage the instrument SAFETY PRECAUTIONS WARNING These instruments are intended for us...

Page 9: ...oving the cover WARNING Never use this instrument or any probe or sensor inside a microwave oven CAUTION Avoid making sharp bends in probe or sensor lead wires Bending lead wires at a sharp angle can...

Page 10: ...ttery compartment by sliding it off in the direction of the arrow located on the battery cover 2 Remove the old battery 3 Place the new battery in the battery compartment Be sure to observe proper pol...

Page 11: ...Ni Cd battery and published specifications do not apply to measurements made during recharging Turn off the instrument to recharge the battery Allow 7 hours to recharge the battery fully Then unplug t...

Page 12: ...uctions Display reads E2 momentarily 1 Attempt made to activate non installed ramp function NOTE RAMP Function enabled on Models 845 and 855 only Display reads HI 1 Meter mode input temperature exceed...

Page 13: ...ent operation It also defaults to K type thermocouples and F readings with 0 1 resolution The corresponding LCD annunciators are enabled METER Unit functioning as a thermometer K K type thermocouple F...

Page 14: ...display when first selected Both T and R annunciators remain on to indicate a Tungsten Rhenium selection To recall the actual G C D selection turn the unit off then on again for another momentary read...

Page 15: ...odes is automatic 2 Set instrument to METER mode 3 Use the Sensor Select key to set the instrument to the appropriate function and range NOTE Due to limited display area 100 and 1000 RTD s are indicat...

Page 16: ...he memory location numbers keys 0 1 9 The corresponding memory annunciator turns on and the meter returns momentarily to the OPR mode displaying thermocouple temperature eg STORE 7 NOTES The enabled l...

Page 17: ...mode depress OPR after recalling the last reading All active location annunciators will turn on again together with the OPR annunciator NOTE Recalling data from unused i e empty locations will give a...

Page 18: ...readout 5 Select the desired temperature scale F C key 6 Select the resolution desired 0 0 1 key NOTE With 1 resolution one less key stroke will be required to enter calibrator output temperatures via...

Page 19: ...ransmitters operate with a pulsating current which won t work with the 850 855 These devices are normally provided with a calibration mode which when enabled stops sending pulsating current and suppli...

Page 20: ...ator outputs observe specified limits to excitation currents If in doubt check current levels with a DMM in series with either source lead 1 or 3 NOTE Due to limited display area 100 and 1000 RTD s ar...

Page 21: ...p is stored in a location already in use the new set up replaces the old Saved set ups are retained during power off To store a reading of 0 just press the CLEAR while in the CALIB OPR mode Then depre...

Page 22: ...is feature allows the calibrator to automatically ramp up and down a user defined staircase Up and down keys allow for manual ramping by the user To activate the RAMP function the instrument must firs...

Page 23: ...t procedure Products with thermocouple functions only follow the Thermocouple Calibration procedure below Products with resistance functions RTD thermistor ohms follow first the Thermocouple Calibrati...

Page 24: ...n on U U T and verify that RTD and annunciators are flashing on the display This verifies removal of J1 and J2 respectively NOTE Flashing RTD indicates that zero offset corrections can be stored in EE...

Page 25: ...e TC simulator output to Type T 32 F ALLOY mode 10 Reconfigure calibration set up per Figure 12 Allow 2 3 minutes for thermal stabilization 11 Calculate E1 as follows E1 U U T Reading 32 0 12 Set U U...

Page 26: ...000mV P1 32 0 0 5 F 10 S 0 000mV P1 32 0 0 5 F 11 G 2 238mV P1 600 0 0 2 F 12 C 0 000mV P1 32 0 0 2 F 13 D 0 000mV P1 32 0 0 2 F exclusive of noise Table 2 Calibrator Mode Zero Gain Adjustments STEP...

Page 27: ...Y GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 25 SERVICE INFORMATION Figure 11 Calibration Setup Copper Mode Figure 12 Calibration Setup Meter Mode Figure 13 Calibration Setup Cali...

Page 28: ...d at an ambient temperature of 23 C 1 C with relative humidity less than 80 Preparation for Calibration 1 Turn off unit and remove bottom cover Refer to Disassembly Instructions 2 Secure battery with...

Page 29: ...10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 27 SERVICE INFORMATION Figure 14 Resistance Calibration Setup...

Page 30: ...5 Switch current source to OPERATE mode 6 Perform calibrator mode adjustments and verifications per Table 4 use Table 6 for RTD Thermistor models 7 Turn off unit Remove tape holding battery 8 Re insta...

Page 31: ...2 0 F 100 A 0 10000 0 00003V 6 1 000 900 00 1mA 0 90000 0 00010V 7 1 000 1 00 1mA 0 00100 0 00010V 8 10 000 9000 0 100 A 0 900000 0 00010V 9 10 000 10 0 100 A 0 000100 0 00010V exclusive of noise Tabl...

Page 32: ...40 0 F 10 A 0 75790 0 00500V exclusive of noise 2 CALIBRATION VERIFICATION Calibration is verified with the same instrument hookups as used for calibration ie Figures 12 and 13 for thermocouple funct...

Page 33: ...e s from the ITS 90 table This feature enables the user to make accurate temperature measurements without making manual calculations for error corrections COPPER MODE VERIFICATION PROCEDURE FOR THERMO...

Page 34: ...2500 0 F display will blink and NUM will appear on the display 17 Press 3 2 0 buttons and then press the ENTER function button NUM will disappear and 32 0 F will appear not blinking The voltmeter shou...

Page 35: ...blinking The voltmeter should read 2 238 mV 32 Press the SENSOR SELECT function button The sensor type will change to type C A C will appear momentarily in the center of the display 600 0 will then ap...

Page 36: ...simulator voltage source 3 Voltmeter accurate to 1 uV resolution 4 Cable assembly 1 Start your calibration with a fresh battery 2 Press the ON function button to turn the unit on 3 Select the calibra...

Page 37: ...TER function button on the U U T and ensure the U U T is still set for F and type K thermocouple 13 Set the thermocouple simulator to type K and output an output of 32 0 F The U U T should read 32 0 F...

Page 38: ...10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 36 SERVICE INFORMATION 3 MECHANICAL PARTS DIAGRAM...

Page 39: ...service center is located The customer shall be responsible for paying all shipping duties taxes and additional costs if the product is transported to any other locations Repaired products are warrant...

Page 40: ...and working standards and testing apparatus in accordance with established procedures and documented results Reference ANSI NCSL Z540 1 1994 Final calibration of this instrument was performed with re...

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