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TABLE OF CONTENTS General Information......................................................................... 2 Common Specifications................................................................... 2 Unique Specifications ...................................................................... 5 Features........................................................................................... 6 Manual Addenda .............................................................................
GENERAL INFORMATION This manual provides operating instructions and maintenance information for five temperature instruments. These instruments are high performance calibrator-thermometers capable of simulating and measuring a wide-variety of sensors. In addition, features such as data storage and ramping further enhance their versatility. It is recommended that you read this manual thoroughly, especially the sections on safety, prior to operating these instruments.
RTD; ±0.2°F (rdg ≥ – 50°F) RTD; ±0.5°F (rdg < – 50°F) RTD; ±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 RESOLUTION: OHMS; 0.01Ω/0.1Ω/1Ω REPEATABILITY (1 week at constant ambient temperature): K, J, T, E, N; ±0.2°F typ. B, R, S, G, C, D; ±1.0°F typ. RTD, THERMISTOR; ±0.1°F typ. OHMS; ±0.01% rng typ. TEMPERATURE COEFFICIENT: From 18°C to 28°C, included in accuracy specifications.
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.
BATTERY LIFE, CONTINUOUS: 10 hrs. typical, alkaline; 3 hrs typical, Ni-Cd (rechargeable). BATTERY INDICATOR: Display indicates BAT when less than 10% of life remains. DIMENSIONS, WEIGHT: 7.0" × 2.9 × 1.1". Net weight 12 oz. UNIQUE SPECIFICATIONS NOTE: The specifications below are specific to the model(s) as identified by model number. The difference specifications are in addition to the OVERALL SERIES SPECIFICATIONS found on pages 2-5.
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; ±(0.006% rdg + 0.03°C)/°C RTD, THERMISTOR, OHMS; ±(0.006% rdg +0.012% rng)/°C RAMP FUNCTION: Not Included.
UNPACKING YOUR UNIT Remove the Packing List and verify that you have received all equipment. If you have any questions about the shipment, please call the OMEGA Customer Service Department at 1-800-622-2378 or (203) 359-1660. When you receive the shipment, inspect the container and equipment for any signs of damage. Note any evidence of rough handling in transit. Immediately report any damage to the shipping agent.
WARNING Do not touch a temperature probe sheath when measuring excessively high or low temperatures, or toxic substances. WARNING Do not attempt to measure temperatures beyond the range of the probe being used. Probe damage or personal injury could result from exceeding a probe's maximum temperature rating. WARNING The American National Safety Institute (ANSI) states that a shock hazard exists when probes or sensors are exposed to voltage levels greater than 42VDC or 42V peak AC.
CAUTION Keep inputs electrically isolated from outputs. Do not connect an external voltage source between the two connectors, and avoid any external electrical pathways between input and output (T2 & T1). Failure to do so will disturb meter readings and calibrator output levels. Damage to the instrument is also possible. Where the meter and calibrator connectors are simultaneously wired into a system lacking the above isolation, it is necessary to use an "ungrounded" (i.e.
2. Remove the old battery by lifting the battery extractor loop. 3. Place the new battery in the battery compartment. Be sure to observe proper polarity. 4. Re-install the battery cover before resuming use of the instrument. NOTES: • Less than 10% of battery life remains when the BAT annunciator turns on. • When the battery is excessively discharged, the display is blanked.
OPERATING INSTRUCTIONS 1. DIAGNOSTICS AND ERROR MESSAGES Unit self-diagnostics provide fault condition readouts which are described below: PROBLEM: LIKELY CAUSE: Blank display, unit does not power-up. (1) Improper battery installation. (1) Check battery polarity. (2) Dead battery. BAT Annunciator. (1) Low battery voltage, install a new battery. If problem persists, consult factory. Display reads OPEN. (1) No thermocouple, RTD or thermistor is plugged into the meter input.
Figure 2. Keypad Figure 3. Display Test If the unit is turning on for the first time after a new battery is installed, it will automatically default to the METER mode (ie. temperature measurement operation). It also defaults to K-type thermocouples, and °F readings with 0.1° resolution.
METER: (unit functioning as a thermometer) K: (K-type thermocouple) °F: (Fahrenheit readings) OPR: (Instrument is operational) If no input thermocouple is connected to the unit at this time, the numeric segments will indicate "OPEN". Plugging a thermocouple into the meter jack (connector T2, on the top right side) will give actual thermocouple temperature readings. NOTE: To obtain full accuracy, allow 1-2 minutes after connecting a thermocouple plug, for thermal setting.
6. Select display resolution with 0.1°/1° key. NOTE: Set-up is retained during power-off. Hold: Meter readings can be put on hold at any time by depressing the HOLD key. At this time, the HOLD annunciator turns on, the reading is frozen, and all keys (except ON/OFF and HOLD) are locked out. Depress the HOLD key again to return to real-time readings, and re-enable the keypad. 4. METER MODE OPERATION (RTD, Thermistor & Ohms) Set-Up: 1.
WHT BLK GRN RED Figure 6. 4-Wire Resistance Measurement 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 terminals, and are able to distinguish between 2-4 and 3-wire hookups.
To Save Readings: 1. While in the METER OPR mode, depress the STORE key. Note that the OPR annunciator is replaced by STO. 2. Next depress one of the 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 location annunciator indicates that the meter reading at the instant that the location number key was hit, was stored in memory.
eg. eg. eg. eg. RECALL 3 RECALL 5 RECALL 2 etc. 4. To return the meter to the operate 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 (ie, empty) locations will give a zero reading. To Erase Data Locations (Meter Mode): 1. Individual data locations can be erased by recalling the location to be cleared, followed by a CLEAR key input.
6. Select the resolution desired (0.1°/1° key). NOTE: With 1° resolution, one less key stroke will be required to enter calibrator output temperatures via the keypad. 7. The unit accepts numeric inputs by first changing the keypad to its number-entry mode (NUM) by depressing the CHANGE/ENTER key once. The numeric display will flash, the OPR annunciator will turn off, and the NUM annunciator will turn on. Key in desired temperature value, most significant digit first.
mA (current) source Calibrator (out) Thermometer (in) I out V out Figure 8. 2-Wire Resistance Simulation Figure 9. 3-Wire Resistance Simulation GRN RED BLK WHT NOTE: Colors indicated apply to Model 84937 Calibration Cable. Figure 10.
1. The same performance tradeoffs apply to 2, 3 and 4-wire simulations as to 2, 3, and 4-wire measurements. Refer to RTD, Thermistor and Ohms Meter-Mode section above for wiring guidelines. 2. Set instrument to CALIBRATOR mode. 3. Use the sensor-select key to set the instrument to the appropriate function and range. 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).
To Recall Outputs: 1. While in the CALIB OPR mode, set-ups saved earlier in memory can be recalled to program the calibrator output. First depress the RECALL key to recall a set-up. 1. Note that the RCL annunciator turns on, OPR turns off, and all memory locations annunciators are blanked. 2. Next hit the key with the number corresponding to the desired memory location. The corresponding annunciator turns on, and the LCD updates to show the new calibrator setting. eg. RECALL 8 3.
9. STEP FUNCTION When operating in the CALIBRATOR mode, the STEP key will sequentially recall data stored in memory (up to 10 steps). At each step, the calibrator will display and output these parameters. The STEP function is non-functional in METER mode. 10. RAMP FUNCTION: CL25 and CL27 This feature, available only on Models CL25 and CL27, allows the calibrator to automatically ramp up and down a user-defined staircase. Up and down keys allow for manual ramping by the user.
SERVICE INFORMATION WARNING All service information is intended for qualified electronic maintenance personnel only. 1. CALIBRATION PROCEDURES This is a two-part procedure. Products with thermocouple functions only, follow the Thermocouple Calibration procedure below. Products with resistance functions (RTD, thermistor, ohms) follow first the Thermocouple Calibration procedure, then the Resistance Calibration procedure. A. THERMOCOUPLE CALIBRATION Test Equipment Required: 1.
NOTE: For calibrators with the older, single-jumper configuration, refer to calibration procedure beginning on page 39. 14. Install calibration cover in place of bottom-cover. 15. Re-install battery. 16. Hook up test-equipment, calibration cables, and U.U.T. per Figure 10. 17. Turn on DMM and TC simulator for warmup. Allow at least 30 minutes. 18. Set the DMM to 200mV DC range. 19. Set the TC simulator to its COPPER output mode, with a reference temperature of 32.0°F. 10. Turn on U.U.T.
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. 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.
Table 1: Meter-Mode Zero & Gain Adjustments Step Sensor Select U.U.T. Input Adjust U.U.T. Reading* 1 2 K K 0.000 mV 54.856 mV P1 P11 32.0 ±0.1°F 2500.0 ±0.1°F 3 4 5 6 7 8 9 10 11 12 13 Repeat Steps 1 & 2 As Required J T E N B R S **G** C D 0.000 0.000 0.000 0.000 1.439 0.000 0.000 2.238 0.000 0.000 mV mV mV mV mV mV mV mV mV mV P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 32.0 ±0.1°F 32.0 ±0.1°F 32.0 ±0.1°F 32.0 ±0.1°F 1000.0 ±0.5°F 32.0 ±0.5°F 32.0 ±0.5°F 600.0 ±0.2 °F 32.0 ±0.2°F 32.0 ±0.
Figure 11. Calibration Setup, Copper Mode. Figure 12. Calibration Setup, Meter Mode. Figure 13. Calibration Setup, Calibrator Mode.
B. RESISTANCE CALIBRATION NOTE: Thermocouple and resistance calibrations are independent. However, potentiometer P1 is used in both thermocouple and resistance calibrations to set EEPROM constants. Follow calibration procedures carefully to ensure that thermocouple and resistance calibrations do not disturb one another. Test Equipment Required: 1. Resistance Decades (General Resistance RTD-100, RTD-500/1000, and RDS-54, or equivalent). 2. Current Source (Fluke 5101B, or equivalent). 3.
Figure 14.
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. Hit OPR key (Flashing 'RTD' annunciator turns off). 3. Install J1 jumper. 4. Set unit to CALIB mode, RTD-100, °F. 5. Switch current source to OPERATE mode.
Table 4: Calibration of Calibrator-Mode Resistance Functions (RTD-100/1000) Step Sensor Select Unit Output Current Source Input 1 2 RTD-100 RTD-100 1562.0°F 32.0°F 1mA 1mA 3 RTD-100 –328.0°F 1mA 4 5 RTD-1000 RTD-1000 1562.0°F 32.0°F 100µA 100µA 6 1,000Ω 900.00Ω 1mA √ 7 1,000Ω 1.00Ω 1mA √ 8 10,000Ω 9,000.0Ω 100µA √ 9 10,000Ω 10.0Ω 100µA √ DMM Verify Reading* Adjust P38 0.39026v 0.10000 ±0.00003v 0.01849 ±0.00006v 0.39026v 0.10000 ±0.00003v 0.90000 ±0.00010v 0.00100 ±0.
Table 6: Calibration of Calibrator-Mode Resistance Functions (RTD-Thermistor) Step Sensor Select Unit Output Current Source Input 1 2 RTD-100 RTD-100 1562.0°F 32.0°F 1mA 1mA 3 RTD-100 –328.0°F 1mA √ 4 1,000Ω 900.00Ω 1mA √ 5 1,000Ω 1.00Ω 1mA √ 6 7 100,000Ω 100,000Ω 90,000Ω 100Ω 10µA 10µA 8 Thermistor 293.0°F 1mA √ 9 Thermistor 77.0°F 10µA √ 10 Thermistor –40.0°F 10µA √ Adjust P38 P51 DMM Verify Reading* √ √ 0.39026v 0.10000 ±0.00006v 0.01849 ±0.00012v 0.
Model CL23A CL24 CL25 CL26 CL27 Software Revision 6.7 7.7 3.7 5.6 4.16 (Software revision is marked on a label attached to integrated-circuit U1 on the mother-board). "Copper-mode" is a non-compensated mode of operation during which cold-junction compensation of inputs and outputs is disabled. This permits the use of copper-wire interconnections between instruments, while avoiding the time and expense of multiple thermocouple-cable hookups.
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. Select °F (“°F” on display) by pressing the °F °C function button. 7. Press the CHANGE function button. The numerical display should blink. 8. Press 9 9 9 9 9. (“9999.9” should appear blinking on display). 9. Press the ENTER function button.
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. The “T” will disappear from the display and an “E” will appear on the display. The voltmeter should read 0.000 mV. 21. Press the SENSOR SELECT function button. The sensor type will change to type N.
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 appear in the center of the display and both the “T” and “R” will appear along the top row of the display. 33. Press the CHANGE function button. The “600.0 °F” display will blink, and “NUM” will appear on the display. 34. Press 3 2 0 buttons and then press ENTER function button. “NUM” will disappear and “32.0 °F” will appear, not blinking.
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. 6. Select °F (“°F” on display) by pressing the °F °C function button. 7. Attach the Alloy Mode Calibrator Verification Cables per Fig. 12 & 13.
4.
CALIBRATION PROCEDURES Test Equipment Required: 1. Thermocouple simulator (OMEGA CL25, or equivalent). 2. Microvolt null-meter (Keithley 155, or equivalent) 3. Calibration cover (OMEGA 820-307-4). 4. Calibration cables, T.C. types K, J, T & E (as required) per Figure1 below. 5. Low-thermal (eg. copper) shorting-link for null-meter. NOTE: The (2) alloy-copper junctions in the calibration cables can be either solder-joints (cleaned to remove flux), or crimp-connections.
NOTE: • With J1 removed, the digital-filters in the U.U.T. are disabled. This is to speed up U.U.T. response to calibration adjustments. In this mode ±0.1°F of reading noise is normal. NOTE: • Do not deviate from the calibration adjustment sequence that follows. This will ensure that zero adjustments for each TC type will be stored in the appropriate memory locations. 18. Apply 32°F (Type K) to U.U.T. Adjust potentiometer P1 for a reading of 32.0°F (exclusive of noise). 19. Apply 2500°F (Type K) to U.U.T.
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. Hit OPR key to store E-meter zero-adjustment. 29. Select Type-K thermocouple. 30. Select CALIB mode. 31. Turn off U.U.T. 32. Connect U.U.T. to test-equipment per Figure 3 using the K calibrationcable. 33. Turn-on U.U.T.
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 CL24 only. For Model CL23A go next to step 55. 49. Select Type-E thermocouple. 50. Turn off U.U.T. 51. Replace T calibration-cable with E calibration-cable. 52. Turn on U.U.T. Allow 2-3 minutes for thermal stabilization. 53. Set both the U.U.T. and thermocouple-simulator to 32.0°F (Type E).
NOTES 43
NOTES 44
MADE IN USA WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 37 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal three (3) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit should malfunction, it must be returned to the factory for evaluation.
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