Omega 24 User Manual

hhtp://www.omega.com e-mail:[email protected] CL23A, 24, 25, 26, 27Digital Calibrator/Thermometer

WARNING Do not touch a temperature probe sheath when measuring excessively high or low temperatures, or toxic substances. WARNING Do not atte

CAUTION Keep inputs electrically isolated from outputs. Do not con- nect an external voltage source between the two connectors, and a

2. Remove the old battery. 3. Place the new battery in the battery compartment. Be sure to observe proper polarity. 4. Re-install the battery co

OPERATING INSTRUCTIONS 1. DIAGNOSTICS AND ERROR MESSAGES Unit self-diagnostics provide fault condition readouts which are described below: PROBLE

Figure 2. Keypad Figure 3. Display Test If the unit is turning on for the first time after a new battery is installed

METER: (unit functioning as a thermometer) K: (K-type thermocouple) °F: (Fahrenheit readings) OPR: (Instrument is o

6. Select display resolution with 0.0.1 key. NOTE: Set-up is retained during power-off. Hold: Meter readings can be put on hold at any time by d

Figure 6.4-Wire Resistance Measurement Lead resistance errors are compensated for in 3-wire configurations. However full compensation

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

eg.RECALL 3 RECALL 5 RECALL 2 etc. 4. To return the meter to the operate mode, depress OPR after recalling the last reading. A

Servicing North America USA: One Omega Drive, Box 4047 ISO 9001 Certified Stamford, CT 06907-0047 Tel: (203) 359-1660 FAX: (203

6. Select the resolution desired (0.0.1 key). NOTE: With 1° resolution, one less key stroke will be required to enter calibrator ou

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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

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 depres

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 ste

SERVICE INFORMATION WARNING All service information is intended for qualified electronic mainte- nance personnel only. 1. CALIBRATION PROCEDU

NOTE: For calibrators with the older, single-jumper configuration, refer to calibration procedure beginning on page 39. 4. Install calibr

Calibration Adjustments: NOTE: Do not deviate from the calibration adjustment sequence that follows. This will ensure

*exclusive of noise. **on EC models, G replaced by L.Calibrate L per J. 26

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TABLE OF CONTENTS General Information ... 2 Common Specifications.

B. RESISTANCE CALIBRATION NOTE: Thermocouple and resistance calibrations are independent. However, potentiometer P1 is used in both the

Figure 14. Resistance Calibration Setup 29

Calibration Adjustments: NOTE: Do not deviate from the calibration adjustment sequence that follows. This will ensure that adjust

* exclusive of noise 31

Table 6: Calibration of Calibrator-Mode Resistance Functions (RTD-Thermistor) *exclusive of noise 2. CALIBRATION VERIFICATION Calibration i

Model Software Revision CL23A 6.7 CL24 7.7

4. Select type K thermocouple ("K" on display) by pressing the SENSOR SELECT function button until type K is reached. 5. Select the te

19. Press the SENSOR SELECT function button. The sensor type will change to type T. The "J" will disappear from the display and a &qu

32. Press the SENSOR SELECT function button. The sensor type will change to type C. A "C" will appear momentarily in the center of

3. Select the calibrator mode ("CALIB" on display) by pressing the CALIB/METER function button. 4. Select type K thermocouple ("K&q

GENERAL INFORMATION This manual provides operating instructions and maintenance information for five temperature instruments. These instruments a

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CALIBRATION PROCEDURES Test Equipment Required: 1. Thermocouple simulator (OMEGA CL25, or equivalent). 2. Microvolt null-meter (Keithley 155,

• With J1 removed, the digital-filters in the U.U.T. are dis- abled. This is to speed up U.U.T. response to calibra- tion adjus

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 minu

45. Replace J calibration-cable with T calibration-cable. 46. Turn on U.U.T. Allow 2-3 minutes for thermal stabilization. 47. Set both the U.U

NOTES 43

NOTES 44

RTD; ±0.2°F (rdg> 50°F) ±0.5°F (rdg < - 50°F) ±0.2°F ±0.04% rdg (meter mode) THERMISTOR;

KEYPAD: 12 momentary switches with tactile feedback select; • On/Off • Change/Enter • Clear/-0 • Sensor Select/1 • °F/°C/2

BATTERY LIFE, CONTINUOUS: 10 hrs. typical, alkaline; 3 hrs typical, Ni-Cd (rechargeable). BATTERY INDICATOR: Display indicates BAT when less than 10

ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5 °F (rdg > -50°F). ±0.04% rdg (rdg > 1250°F)

UNPACKING AND INSPECTION Remove the Packing List and verify that you have received all equipment. If you have any questions about the shipment, pl