Omega CL23A, CL24, CL26, CL25, CL27 User Manual

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User’s Guide

CL23A, 24, 25, 26, 27

Digital Calibrator/Thermometer

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is
constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the
CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected applications.

TABLE OF CONTENTS

General Information......................................................................... 2

Common Specifications................................................................... 2

Unique Specifications ...................................................................... 5

Features........................................................................................... 6

Manual Addenda ............................................................................. 6

Unpacking Your Unit........................................................................ 7

Safety Information ........................................................................... 7

Safety Precautions .......................................................................... 7

Battery Installation/Replacement..................................................... 9

Memory Backup.............................................................................. 10

Operation with Rechargeable Battery............................................. 10

Operating Instructions..................................................................... 11

11. Diagnostics and Error Messages...................................... 11

12. Initial Turn On ................................................................... 11

3. Meter Mode Operation (Thermocouple) ........................... 13

14. Meter Mode Operation (RTD, Thermistor, Ohms)............ 14

15. Data Logging & Recall...................................................... 15

16. Calibrator Mode Operation (Thermocouples) ................... 17

17. Calibrator Mode Operation (RTD, Thermistor, Ohms) ..... 18

18. Storage and Recall of Calibrator Settings ........................ 20

9. Step Function.................................................................... 22

10. Ramp Function ................................................................. 22

Service Information......................................................................... 23

11. Calibration Procedures ..................................................... 23

12. Calibration Verification...................................................... 32

13. Mechanical Parts Diagram................................................ 38

Warranty ......................................................................................... 45

Limitation of Warranty..................................................................... 45

Statement of Calibration ................................................................. 45

1

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.

COMMON SPECIFICATIONS

THERMOMETER INPUTS: THERMOCOUPLE; Miniature TC jack. RTD, OHMS,

THERMISTOR; T-series instrumentation connector.

CALIBRATOR 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: 1100Ω platinum (∝ = 0.00385)

1000Ω platinum (∝ = 0.00385)

THERMISTOR TYPE: 2252Ω (YSI Series 400).

RANGES: RTK; –200°C to 1372°C, –328°F to 2502°F

RTJ; –210°C to 760°C, –346°F to 1400°F
RTT; –200°C to 400°C, –328°F to 752°F
RTE; –230°C to 1000°C, –382°F to 1832°F
RTN; –200°C to 1300°C, –328°F to 2372°F
RTB; 500°C to 1820°C, 932°F to 3308°F
RTR; 0°C to 1768°C, 32°F to 3214°F
RTS; 0°C to 1768°C, 32°F to 3214°F
RTG; 300°C to 2316°C, 572°F to 4201°F
RTC; 0°C to 2316°C, 32°F to 4201°F
RTD; 0°C to 2316°C, 32°F to 4201°F

RTD; –200°C to 850°C, –328°F to 1562°F

THERMISTOR; –40°C to 150°C, –40°F to 302°F

OHMS; 0-999.99Ω

OHMS; 0-9,999.9Ω
OHMS; 0-99,999Ω

ACCURACY (18°C to 28°C ambient, 2 years)*:

K, J, T, E, N; ± 0.5°F (rdg ≥ –50°F)

K, J, T, E, N; ±1.0°F (rdg < –50°F)

B, R, S, G, C, D; ±1.7°F

2

3

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.
From 0°C to 18°C, and 28°C to 50°C:

K, J, T, E, N; ±(0.002% rdg + 0.03°C)/°C
B, R, S, G, C, D; ±(0.002% rdg + 0.1°C)/°C

RTD, THERMISTOR, OHMS; ±(0.002% rdg + 0.004% rng)/°C

METER-MODE INPUT-CURRENT (THERMOCOUPLES): 50nA typ.

METER-MODE READING-RATE: 1 reading/second typ.

METER-MODE EXCITATION-CURRENTS:

100Ω RTD; <2mA

1000ΩRTD; <200µA

999.99Ω; <2mA

9999.9Ω; <200µA
99999Ω; <50µA

THERMISTOR; T ≤113°F <50µA

T> 113°F, <2mA

CALIBRATOR MODE OUTPUT LOAD (THERMOCOUPLES): 500Ω min.

CALIBRATOR-MODE EXCITATION-CURRENTS:

100Ω RTD; 0.5 – 1mA (0.1 – 2mA typ.)

1000Ω RTD; 50 – 100µA (10-200µA typ.)

999.99Ω; Same as 100Ω RTD

9999.9Ω; Same as 1000Ω RTD
99999Ω; 10 – 20µA (1 – 20µA typ.)

THERMISTOR; T ≤113°F, 10 – 20µA

T> 113°F, 0.5 – 1mA

MAXIMUM COMMON MODE VOLTAGE: 42V peak to earth.

4

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;

• Loaded Memory Locations (10 for data storage, 4 for ramp parameters)

• Low Battery (BAT)

• Number Change Mode (NUM)

• Calibrator Mode (CALIB)

• Meter Mode (METER)

• Operate Mode (OPR)

• Store Mode (STO)

• Recall Mode (RCL)

• Meter Hold (HOLD)

• Scale (°F/°C)

• Sensor Type

POWER OFF CONFIGURATION RETENTION: Instrument retains last selected;

• Sensor Type

• °F/°C Scale

• 0.1°/1° Resolution

• Calibrator/Meter Mode

• Memory Contents (data storage and ramp parameters).

DIAGNOSTICS: Display codes indicate following conditions;

• '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': Temperature Reading or Keypad Entry Too Low For Accuracy

• LCD Test: During power-up, all segments and annunciators enabled momentarily

ENVIRONMENTAL LIMITS FOR OPERATING: 0°C to 50°C, less than 90% relative
humidity (R.H.) up to 35°C; reduce R.H. limit by 3%/°C from 35°C to 50°C.

ENVIRONMENTAL LIMITS FOR STORAGE: –35°C to 60°C, less than 95% relative
humidity (R.H.) up to 35°C; reduce R.H. limit by 3%/°C from 35°C to 60°C.

POWER: 9 volt alkaline battery (NEDA 1604A).

5

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.

• MODEL CL23A/CL23EC:

SENSOR SELECTION: K, J, T/K, J, T, L 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)

TEMPERATURE COEFFICIENT: 18°C to 28°C; included in accuracy specifications.
From 0°C to 18°C, and 28°C to 50°C; less than ±(0.006% rdg +0.03°C)/°C.

RAMP FUNCTION: Not Included.

BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical, Ni-Cd

(rechargeable).

• MODEL CL24:

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)

TEMPERATURE COEFFICIENT: 18°C to 28°C; included in accuracy specifications.
From 0°C to 18°C, and 28°C to 50°C; less than ±(0.006% rdg +0.03°C)/°C.

RAMP FUNCTION: Not Included.

BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical, Ni-Cd

(rechargeable).

• MODEL CL25/CL25EC:

SENSOR SELECTION: K, J, T, E, N, B, R, S, G, C, D/K, J, T, E, N, B, R, S, L, C,
D Thermocouples

RAMP FUNCTION: Included.

BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical, Ni-Cd

(rechargeable)

• MODEL CL26:

SENSOR SELECTION: K, J, T, E Thermocouples

100Ω Platinum RTD
2252Ω Thermistor
1,000Ω/100,000Ω Resistance

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.

• MODEL CL27/CL27EC:

SENSOR SELECTION: K, J, T, E, N, B, R, S, G, C, D/K, J, T, E, N, B, R, S, L, C,

D Thermocouples

100Ω/1000Ω Platinum RTD
1,000Ω/10,000Ω Resistance

RAMP FUNCTION: Included.

FEATURES

• Combination calibrator, thermometer and datalogger.

• Function selection and numeric data entered via 12 keyswitch color coded
keypad.

• Keyswitches have tactile feedback.

• 5 digit 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 memory locations for saving meter readings and/or calibrator outputs.

• Step mode for quick sequential recall of calibrator outputs from memory.

• Manual/automatic ramping for testing controller setpoints.

• Conforms to ITS-90 thermocouple tables.

• Dust proof, splash proof, drop proof construction.

• Built-in tilt stand/hanger for bench use or hands free field measurements.

• User friendly programming.

• Retains data and programming, even when turned off.

• Performs diagnostic tests and indicates fault conditions.

• Low battery and open sensor indications.

MANUAL ADDENDA

Improvements or changes to this manual will be explained on an addendum
included with the instrument. All change information should be incorporated
immediately into the appropriate places in the manual.

6

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 [phone].

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.

NOTE: The carrier will not honor any claims unless all shipping
material is saved for their examination. After examining and
removing contents, save packing material and carton in the event
reshipment is necessary.

Make sure that you have the following items in the packing box.

• 1 CL20 Series Calibrator and Holster.

• 1 Operator’s Manual

• 1 NIST Certificate

• 1 Accessories Kit

SAFETY INFORMATION

SAFETY SYMBOLS AND TERMS

The symbol on the instrument denotes that the user should refer to the

operating instructions.

The WARNING used in this manual explains 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 use by qualified person­nel trained in the safe operation of electronic testing equip­ment. Read the instruction manual thoroughly before using,
to become familiar with the instrument's operations and
capabilities.

▲

!

7

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. Do not
use this instrument where voltages at the measurement sur­face exceed these levels.

WARNING

Do not substitute a metal part for the nylon screw in the rear
case. Doing so will degrade electrical isolation of the case.

WARNING

The battery is accessible through a cover on the back of the
instrument. To avoid electrical shock hazard, disconnect all
temperature probes and sensors and turn the unit off before
removing 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 damage the wire
causing probe failure.

8

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. electrically isolated)
probe at the thermometer input.

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 connec­tions before replacing the battery. Put the cover back into
place on the battery compartment before resuming use of
the instrument.

1. Remove the cover from the battery compartment by sliding it off in the
direction of the arrow located on the battery cover.

9

Figure 1. Battery Installation

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.

• If the instrument is going to be stored for a long period of time
or in a high temperature environment, remove the battery to
prevent leakage damage.

• After a new battery is installed, allow approximately 5 sec-

onds for display turn-on the first time the unit is turned on.
During this period, microcomputer initialization is per­formed.

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 an HH22-AC battery charger. Then
exchange batteries, and disconnect the battery charger. Do not leave the bat­tery charger connected to instruments with non-rechargeable batteries.

OPERATION WITH RECHARGEABLE

BATTERY

HH22-AC provides a 9-volt Ni-Cd battery and recharger suitable for use with

the unit. This battery provides 3-4 hours of continuous operation. This dura­tion can be extended to several days by operating simultaneously from both
the battery and recharger.

Turn off the instrument to recharge the battery. Allow 7 hours to fully
recharge the battery. Then unplug the recharger to avoid overcharging.

10

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 (1) Improper battery installation.
power-up. (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 thermis-

tor is plugged into the meter input.

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 CL25 and CL27 only.

Display reads HI. (1) Meter-mode input-temperature

exceeds rating of selected sensor.

(2) Calibrator-mode keypad-entry

exceeds rating of sensor type.

Display reads LO. (1) Meter-mode input-temperature too

low for accurate measurement.

(2) Calibrator-mode keypad-entry too

low for accurate simulation.

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).

NOTE: In case of missing or poor-contrast segments, contact

factory.

11

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. The corresponding LCD annunciators are enabled:

12

Figure 3. Display Test

Figure 2. Keypad