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Tegam 841 Instruction Manual

Digital temperature calibrator - thermometer
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Digital Temperature
Calibrator - Thermometer
Instruction Manual
Models 840A, 841, 845, 850, and 855
Publication Date: September 2003
Document Number: 840A-901-01CD Rev F

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Summary of Contents for Tegam 841

  • Page 1 Digital Temperature Calibrator - Thermometer Instruction Manual Models 840A, 841, 845, 850, and 855 Publication Date: September 2003 Document Number: 840A-901-01CD Rev F...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS General Information................2 Common Specifications................. 2 Unique Specifications................5 Features....................6 Manual Addenda..................6 Unpacking and Inspection ..............7 Safety Information ................. 7 Safety Precautions................. 7 Battery Installation/Replacement............9 Memory Backup..................10 Operation with Rechargeable Battery........... 10 Operating Instructions................

  • Page 3: General Information

    GENERAL INFORMATION This manual provides operating instructions and maintenance information for five temperature instruments. These instruments are high performance cali- brator-thermometers capable of simulating and measuring a wide-variety of sensors. In addition, features such as data storage and ramping further enhance their versatility.
  • Page 4 RTD; ±0.2°F (rdg≥ - 50°F) ±0.5°F (rdg < - 50°F) ±0.2°F ±0.04% rdg (meter mode) THERMISTOR; ±0.5F OHMS; ±0.02% range * Exclusive of sensor errors, and lead resistance induced errors. RESOLUTION: TEMPERATURE; 0.1 °/1° F/C OHMS; 0.01Ω/0.1Ω/1Ω REPEATABILITY (1 week at constant ambient temperature): K, J, T, E, N;...
  • Page 5 KEYPAD: 12 momentary switches with tactile feedback select; • On/Off • Change/Enter • Clear/-0 • Sensor Select/1 • °F/°C/2 • Resolution/3 • Operate/4 • Store/5 • Recall/6 • Calibrator/Meter/Up Ramp/7 • Calibrator Step/Down Ramp/8 • Calibrator Ramp/Meter Hold/9 DISPLAY: 5 digit LCD, 0.4" height, and decimal point. Annunciators; •...

  • Page 6: Unique Specifications

    RAMP FUNCTION: Not Included. BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical, Ni-Cd (rechargeable). • MODEL 841: SENSOR SELECTION: K, J, T, E Thermocouples ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5°F (rdg≥ -50°F). ±0.04% rdg (rdg > 1250°F) ±1.0°F (rdg <-50°F)

  • Page 7: Features

    ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5 °F (rdg ≥ -50°F). ±0.04% rdg (rdg > 1250°F) ±1.0°F (rdg <-50°F) OHMS; ±0.04% range TEMPERATURE COEFFICIENT: 18°C to 28°C; included in accuracy specifications. From 0°C to 18°C, and 28°C to 50°C. K, J, T, E;...

  • Page 8: Unpacking And Inspection

    UNPACKING AND INSPECTION Each instrument is inspected both mechanically and electrically before ship- ment. Upon receiving your instrument unpack all items from the shipping con- tainer and check for any obvious damage that may have occurred during transit. Report any damage to the shipping agent. Retain and use the origi- nal packing materials if reshipment is necessary.
  • Page 9 WARNING The American National Standards Institute (ANSI) states that a shock hazard exists when probes or sensors are exposed to voltage levels greater than 42VDC or 42V peak AC. Do not use this instrument where voltages at the measurement sur- face exceed these levels.

  • Page 10: Battery Installation/Replacement

    BATTERY INSTALLATION/REPLACEMENT A 9V alkaline battery is supplied with the instrument but not installed. Read the following installation instructions before attempting to install or remove the battery. Replacement batteries should also be alkaline types. WARNING Turn the unit off and disconnect any input/output connec- tions before replacing the battery.

  • Page 11: Memory Backup

    MEMORY BACKUP During battery replacement, the contents of user-programmed memory (data, operating modes, etc.) can be saved. Prior to removing the old battery, turn off the instrument, and connect a Model 80010 battery charger. Then exchange batteries, and disconnect the battery charger. Do not leave the bat- tery charger connected to instruments with non-rechargeable batteries.
  • Page 12 Display reads E1 momentarily. (1) This indicates that an invalid key- pad entry has been made. Review keystroke sequence, or consult manual for input instructions. Display reads E2 momentarily. (1) Attempt made to activate non- installed ramp function. NOTE: RAMP Function enabled on Models 845 and 855 only.

  • Page 13: Initial Turn On

    Figure 3. Display Test 2. INITIAL TURN ON Turn on the instrument by depressing the ON-OFF keyswitch once (Figure 2). At power-up, the unit first performs a display test. All segments and annunciators of the liquid crystal (LCD) are momentarily turned on for visual confirmation by the user (Figure 3).

  • Page 14: Meter Mode Operation (Thermocouple)

    3. METER MODE OPERATION (Thermocouples) Set-Up: 1. Turn on instrument by depressing the ON/OFF key. 2. Check that the BAT annunciator turns off following the power-up LCD test. If it does not turn off, less than 10% of battery remains. Refer to Battery Installation/Replacement instructions.
  • Page 15 Lead resistance errors are compensated for in 3-wire configurations. However full compensation requires equal resistance in each lead. This configuration is common with 100-ohm RTDs. In 4-wire configurations, accuracy is unaffected by lead resistance, and resistance differences between leads. NOTE: These instruments measure input voltages on all 4 termi- nals, and are able to distinguish between 2-4 and 3-wire hookups.

  • Page 16: Data Logging & Recall

    Figure 6. 4-Wire Resistance Measurement Any of these readouts can be recalled by turning the unit off and back on. 5. DATA LOGGING AND RECALL Operating as a meter, the unit can save and recall up to 10 readings (each with independent parameters: eg.
  • Page 17 2. Next depress the keypad number corresponding to the desired location. Note that the annunciator for this location turns on, and the memory con- tents are displayed. 3. Several stored readings can be randomly recalled by a key sequence such as: eg.RECALL 3 RECALL 5 RECALL 2...

  • Page 18: Calibrator Mode Operation (Thermocouples)

    6. CALIBRATOR MODE OPERATION (Thermocouples) Set-Up: 1. Turn on the instrument by depressing the ON/OFF key. 2. Check that the BAT annunciator turns off after display check. If not, refer to Battery Installation/Replacement instructions. 3. When operating as a calibrator, the display indicates CALIB. Should the instrument be in the METER mode, hit the CALIB key to change to the cal- ibrator function.

  • Page 19: Calibrator Mode Operation (Rtd, Thermistor, Ohms)

    • To correct a numeric entry while in the NUM mode, hit the CHANGE/ENTER key twice. This will return number entry to the beginning of a new number. • To return the calibrator output to 0° while in the OPR mode, hit the CLEAR key.
  • Page 20 Figure 9. 3-Wire Resistance Simulation Figure 10. 4-Wire Resistance Simulation NOTE: To ensure accurate calibrator 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, 100Ω...

  • Page 21: Storage And Recall Of Calibrator Settings

    8. STORAGE AND RECALL OF CALIBRATOR SETTINGS While operating as a calibrator, the unit can store and recall up to 10 output settings (each with independent parameters, eg. °F/°C, sensor type, and res- olution) in random access memory. To Store Outputs: 1.

  • Page 22: Step Function

    4. To return the unit to the CALIB OPR mode after recalling the last set-up, hit the OPR key. NOTES: • Any other key except ON/OFF and CLEAR will also return the OPR mode. • Set-ups recalled from unused locations will display and output 0°.
  • Page 23 cleared like other calibrator settings. (Refer page 16, CALIBRATOR MODE OPERATION). When automatic ramping is in progress, a hit to either the 7 or 8 key activates manual up-ramping or down-ramping respectively. Whenever the battery is replaced (and memory backup is not performed), the ramp parameters default to factory-set values: LOC 1 Step Size =10°F (K TC) 2 Start Point = 500°F...

  • Page 24: Service Information

    SERVICE INFORMATION WARNING All service information is intended for qualified electronic mainte- nance personnel only. 1. CALIBRATION PROCEDURES This is a two-part procedure. Products with thermocouple functions only, fol- low the Thermocouple Calibration procedure below. Products with resistance functions (RTD, thermistor, ohms) follow first the Thermocouple Calibration procedure, then the Resistance Calibration procedure.
  • Page 25 4. Install calibration cover in place of bottom-cover. 5. Re-install battery. 6. Hook up test-equipment, calibration cables, and U.U.T. per Figure 11. 7. Turn on DMM and TC simulator for warmup. Allow at least 30 minutes. 8. Set the DMM to 200mV DC range. 9.
  • Page 26 1. Set meter-mode zero and gain adjustments per Table 1. 2. Hit OPR key (RTD annunciator turns off). 3. Set U.U.T. to CALIB, OPR, K, °F. 4. Turn U.U.T. OFF, then ON, to re-enable RTD & Ω, annunciators. 5. Set calibrator-mode zero and gain adjustments per Table 2. Hit CHANGE and ENTER at the completion of each step in Table 2.
  • Page 27 Table 1: Meter-Mode Zero & Gain Adjustments Sensor U.U.T. U.U.T. Step Adjust Select Input Reading* 0.000mV 32.0±0.1°F 54.856mV 2500.0±0.1°F Repeat Steps 1 & 2 As Required 0.000 mV 32.0±0.1°F 0.000 mV 32.0±0.1°F 0.000 mV 32.0±0.1°F 32.0±0.1°F 0.000 mV 1.439 mV 1000.0±0.5°F 32.0±0.5°F 0.000 mV...
  • Page 28 Figure 11. Calibration Setup, Copper Mode. Figure 12. Calibration Setup, Meter Mode. Figure 13. Calibration Setup, Calibrator Mode.
  • Page 29 B. RESISTANCE CALIBRATION NOTE: Thermocouple and resistance calibrations are indepen- dent. However, potentiometer P1 is used in both thermocouple and resistance calibrations to set EEPROM constants. Follow cal- ibration procedures carefully to ensure that thermocouple and resistance calibrations do not disturb one another. Test Equipment Required: 1.
  • Page 30 Figure 14. Resistance Calibration Setup...
  • Page 31 Calibration Adjustments: NOTE: Do not deviate from the calibration adjustment sequence that follows. This will ensure that adjustments to be stored in EEPROM go to the correct locations. 1. Perform meter-mode adjustments and verifications per Table 3 (use Table 5 for RTD-Thermistor models). 2.
  • Page 32 Table 4: Calibration of Calibrator-Mode Resistance Functions (RTD-100/1000) Current Step Sensor Unit Source Adjust Verify Select Output Input Reading* RTD-100 1562.0°F 0.39048v √ RTD-100 32.0°F 0.10000 ±0.00003v √ RTD-100 -328.0°F 0.01852 ±0.00006v RTD-1000 1562.0°F 100µA 0.39048v √ RTD-1000 32.0°F 100µA 0.10000 ±0.00003v √...

  • Page 33: Calibration Verification

    Table 6: Clibration of Calibrator-Mode Resistance Functions (RTD-Thermistor) Current Step Sensor Unit Source Adjust Verify Select Output Input Reading* RTD-100 1562.0°F 0.39048v √ RTD-100 32.0°F 0.10000 ±0.00006v √ RTD-100 -328.0°F 0.01852 ±0.00012v √ 1,000Ω 900.00Ω 0.90000 ±0.00020v √ 1,000Ω 1.00Ω 0.00100 ±0.00020v 100,000Ω...
  • Page 34 "Alloy-mode" refers to Thermocouple operations; for example, a Type-K thermocouple is made up of Nickel/Chromium and Nickel/Aluminum alloys. Referring to the TEGAM Calibrator(s) in TC operation, "Alloy-mode" means in effect "other than Copper-mode." In order to make accurate measure- ments using a thermocouple device one must eliminate erroneous voltage signals.
  • Page 35 4. Select type K thermocouple ("K" on display) by pressing the SENSOR SELECT function button until type K is reached. 5. Select the tenth degree display (with a digit appearing after the decimal point on the display) by pressing the 0.0.1 function button. 6.
  • Page 36 19. Press the SENSOR SELECT function button. The sensor type will change to type T. The "J" will disappear from the display and a "T" will appear on the display. The voltmeter should read 0.000 mV. 20. Press the SENSOR SELECT function button. The sensor type will change to type E.
  • Page 37 ALLOY MODE VERIFICATION PROCEDURE FOR THERMOCOUPLE FUNCTIONS Equipment Required: 1. TEGAM Model to be verified. 2. Precision temperature simulator / voltage source. 3. Voltmeter accurate to 1 uV resolution. 4. Cable assembly. 1. Start your calibration with a fresh battery.
  • Page 38 3. Select the calibrator mode ("CALIB" on display) by pressing the CALIB/METER function button. 4. Select type K thermocouple ("K" on display) by pressing the SENSOR SELECT function button until type K is reached. 5. Select the tenth degree display with a digit appearing after the decimal point on the display) by pressing the 0.0.1 function button.

  • Page 39: Mechanical Parts Diagram

    4. MECHANICAL PARTS DIAGRAM...
  • Page 40 1. Thermocouple simulator (Ectron 1120, or equivalent). 2. Microvolt null-meter (Keithley 155, or equivalent) 3. Calibration cover (TEGAM 820-307-4). 4. Calibration cables, T.C. types K, J, T & E (as required) per Figure 1 page 43. 5. Low-thermal (eg. copper) shorting-link for null-meter.
  • Page 41 21. Apply 32°F (Type T). Adjust P1 for a reading of 32.0°F (exclusive of noise). 22. Hit OPR key to store T-meter zero-adjustment. NOTE: Steps 23 thru 28 apply to Model 841 only. For Model 840A, go to step 29 next.
  • Page 42 23. Select Type-E thermocouple. 24. Turn off U.U.T. 25. Replace T calibration-cable with E calibration-cable. 26. Turn on U.U.T. Allow 2-3 minutes for thermal stabilization. 27. Apply 32°F (Type E). Adjust P1 for a reading of 32.0°F (exclusive of noise). 28.
  • Page 43 47. Set both the U.U.T. and TC-simulator to output 32.0°F (Type T). Adjust P1 for a null-meter reading of 0±3µV. 48. Hit OPR key to store T-calib zero adjustment. NOTE: Steps 49 thru 54 apply to Model 841 only. For Model 840A go next to step 55. 49. Select Type-E thermocouple.

  • Page 45: Warranty

    TEGAM, Inc. warrants the calibration of this product for a period of two years from date of shipment. During this period we will recalibrate any product that does not conform to the published accuracy specification.
  • Page 46 Weinschel, and Pragmatic Instruments. A complete list can be viewed on our Product Service Directory at www.tegam.com. For more information about TEGAM and our products, please visit our website at www.tegam.com; or contact one of our customer service representatives at sales@tegam.com...

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