Omega 24 User Manual

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CL23A, 24, 25, 26, 27

Digital Calibrator/Thermometer

Servicing North America

USA: One Omega Drive, Box 4047

ISO 9001 Certified
Tel: [phone] FAX: [phone]
e-mail: [e-mail]
Canada: 976 Bergar
Laval (Quebec) H7L5A1
Tel: [phone] FAX: [phone]
e-mail: [e-mail]

USA and Canada: Sales Service: 1-800-826-6342 / 1-800- TC-OMEGA
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico and
Latin America: Tel: (95) 800-TC-OMEGA

En Español: [phone] ext: 2203 email: [e-mail]

Benelux: Postbus 8034 , 1180 LA Amstelveen, The Netherlands
Tel: [phone] FAX: [phone]
Toll Free in Benelux: 06 0993344
e-mail: [e-mail]

Czech Republic: Ostravska 767,733 01 Karvina
Tel: [phone] FAX: [phone]
e-mail: [e-mail]

France: 9, rue Denis Papin, 78190 Trappes
Tel: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342
e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Tel: [phone] FAX: [phone]
Toll Free in Germany: 0130 11 21 66
e-mail: [e-mail]

United Kingdom: 25 Swannington Road, P.O. Box 7, Omega Drive,
ISO 9002 Certified
LE9 6TU, England M44 5EX, England
Tel: [phone] Tel: [phone]
FAX: [phone] FAX: [phone]

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.

Stamford, CT 06907-0047

For immediate technical or application assistance:

SM

Customer Service: 1-800-622-2378 / 1-800-622-BESTSM

MS

FAX: [phone]

Servicing Europe

Broughton Astely, Leicestershire, Irlam, Manchester,

Toll Free in England: 0800-488-488

e-mail: [e-mail]

SM

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

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

2. Initial Turn On............................................................................... 11

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

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

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

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

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

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

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

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

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

1. Calibration Procedures.................................................................... 23

2. Calibration Verification ................................................................... 32

3. Mechanical Parts Diagram............................................................... 38

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

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

1

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.

It is recommended that you read this manual thoroughly, especially the sec­ tions 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: 100Ω platinum (α = 0.00385)

1000Ω platinum (α= 0.00385

)

THERMISTOR TYPE: 2252Ω (YSI Series 400).

RANGES: K; -200°C to 1372°C, -328°F to 2502°F
J; -210°C to 760°C, -346°F to 1400°F
T; -200°C to 400°C, -328°F to 752°F
E; -230°C to 1000°C, -382°F to 1832°F
N; -200°C to 1300°C, -328°F to 2372°F
B; 500°C to 1820°C, 932°F to 3308°F
R; 0°C to 1768°C, 32°F to 3214°F
S; 0°C to 1768°C, 32°F to 3214°F
G; 300°C to 2316°C, 572°F to 4201°F
C; 0°C to 2316°C, 32°F to 4201°F
D; 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
0-9,999.9Ω
0-99,999Ω
ACCURACY (18°C to 28°C ambient, 2 years)*:
K, J, T, E, N; ± 0.5°F (rdg ³ -50°F)
±1.0°F (rdg < -50°F)
B, R, S, G, C, D; ±1.7°F

2

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; ±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; <2μA
1000Ω RTD;<200μA

999.99Ω; <2μA

9999.9Ω; <200μA
99999Ω; <50μA
THERMISTOR; T <
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 t yp.)

999.99Ω; Same as 100Ω RTD

9999.9Ω; Same as 1000Ω RTD
99999Ω; 10 - 20μA (1 - 20μA typ.)
THERMISTOR; T <
T>113°F, 0.5- 1mA

MAXIMUM COMMON MODE VOLTAGE: 42V peak to earth.

113°F <50μA

113°F, 10 - 20μA

3

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

• 'H

• '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).

I': Temperature Reading or Keypad Entry Exceeds Rating

4

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" x 2.9 x 1.1". Net weight 12 oz.

UNIQUE SPECIFICATIONS

NOTE: The specifications below are spe cific 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 Thermocouples
ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5°F (rdg >

±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 (re chargeable).

• MODEL CL24:

SENSOR SELECTION: K, J, T, E Thermocouples
ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5°F (rdg >
±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 Thermocouples
RAMP FUNCTION: Included.
BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical, Ni-Cd (re chargeable)

• MODEL CL26:
SENSOR SELECTION: K, J, T, E Thermocouples

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

-50°F).

-50°F).

5

ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5 °F (rdg >
±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 Thermocouples
100Ω/1000Ω Platinum RTD
1,000Ω/10,000Ω Resistance
RAMP FUNCTION: Included.

-50°F).

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 & RTD 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 AND INSPECTION

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 1-800­622-2378 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

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 .

operating instructions.

SAFETY PRECAUTIONS

WARNING

These instruments are intended for use by qualified person­ nel trained in the safe operation of electronic testing equip­ ment. 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 ofthe probe being used.
Probe damage or personal injury could result from exceeding a probe's maximum
temperature rating.

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 v oltages 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 con­ nect 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 simultane­ ously 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 connec­ tions before replacing the batter y. 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.

Figure 1. Battery Installation

9

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 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 seconds 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. 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.

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

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. The corresponding LCD
annunciators are enabled:

12

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 connect­ ing a thermocouple plug, for thermal setting.

If the instrument is to be used as a thermometer or ohmmeter, refer to the
Meter Mode Operation section for detailed instructions. For use as a tem­ perature-calibrator or ohms simulator, refer to Calibrator Mode Operation

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.

3. If the meter is already in the METER mode, the METER annunciator will
be on. Otherwise the calibrator mode is enabled and the CALIB annunciator is on. Depress
the METER key to return to meter mode.

4. Connect an input thermocouple (TC) to connector T2. Select the appropriate TC Type with
the select-key. A display annunciator will indicate the selected TC-type.

NOTE: Space and legibility constraints on the display preclude the use of dedicated
annunciators for the less common Tungsten-Rhenium thermocouple types (G, C & D).
Instead, these types are annunciated momentarily on the alpha-numeric 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 readout.

5. Select temperature scale with °F/°C key. The corresponding annunciator is enabled.

13