Omega CL940A User manual

CL940A, CL945A
Digital Temperature
Calibrator–Thermometer
TM
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M5725/0219CL940A Rev. A

Table of Contents
TABLE OF CONTENTS
1. Instrument Description ............................................................. 1-1
Specifications .................................................................... 1-1
OMEGA Family of Thermometers........................................... 1-5
2. Preparation for Use .................................................................. 2-1
General Information ........................................................... 2-1
Feature Overview ............................................................... 2-1
Safety Notices and Information ............................................ 2-2
Unpacking and Inspection.................................................... 2-4
Battery Installation and Replacement .................................... 2-4
Initial Power ON ................................................................. 2-5
3. Operating Instructions .............................................................. 3-1
Keypad Functions ............................................................... 3-1
LCD Display....................................................................... 3-2
Setup Menu ....................................................................... 3-4
View Modes and Statistics.................................................... 3-6
Auto-Power Off .................................................................. 3-7
Backlight and Backlight Timeout ........................................... 3-8
Operating Modes ................................................................ 3-8
Trend Indicators................................................................. 3-9
Battery Indicator ................................................................ 3-9
Probe Offset ...................................................................... 3-9
Open Lead Detection Enable/Disable ................................... 3-11
Clear Function.................................................................. 3-11
Presets: Save, Recall and Erase.......................................... 3-12
Invalid Measurement Indications ........................................ 3-13
4. Service Information................................................................ 4-14
Inspection and Cleaning .................................................... 4-14
Calibration ...................................................................... 4-14
Troubleshooting ............................................................... 4-19
Diagnostic Routines and Error Codes ................................... 4-20
Memory Sterilization ......................................................... 4-20
Statement of Calibration.................................................... 4-21
A. Required Equipment ..................................................................A-i
B. Expanded Instrument Uncertainties .............................................B-i
C. Instrument Verification Data Sheet..............................................C-i

Instrument Description
1-1
1. INSTRUMENT DESCRIPTION
Specifications
Source/Measure
Accuracy ±0.003% *[READING]±5µV18° TO 28°C1
R
ESOLUTION
0.01°C
UP TO
999.99°C
AND
0.1°C
≥
1000°C
R
ANGE
-15
M
V
TO
85
M
V
C
OLD
J
UNCTION
E
RROR
±0.15°C
DISPLAY
5-D
IGIT
A
UTO
-R
ESOLUTION
(0.1/0.01)
WITH
B
ACKLIGHT AND
FUNCTION ANNUNCIATORS
A
CCURACY
1
OVER RANGE OF
18
TO
28°C
(64.4
TO
82.4°F) | CJC error included
Conformity
ITS-90
Types B,E,J,K,N,R,S,T
EN 60584-1 2013 Type C
ASTM E988 Table 3 Type D
ASTM E1751 5.1.1 Type G
DIN 43710
Types L and U
ASTM E1751 5.1.2
Type P
Temperature Ranges
°C Range
°C
K
-230°C - 1372°C
-382°F - 2502°F
-230 to -160
±1.2 to ±0.6
-160 to -90
±0.5 to ±0.4
-90 to 380
±0.3
380 to 665
±0.2
665 to 1372
±0.3
J
-200°C - 1200°C
-328°F – 2192°F
-200 to -160
±0.7 to ±0.5
-160 to -110
±0.4
-110 to 10
±0.3
10 to 1200
±0.2
T
-260°C – 400°C
-436°F – 752°F
-260 to -190
±2.6 to ±0.7
-190 to -120
±0.6 to ±0.5
-120 to -70
±0.4
-70 to 80
±0.3
80 to 400
±0.2
1See Graphs in Appendix B for Expanded Uncertainties

Instrument Description
1-2
E
-240°C – 1000°C
-400°F – 1832°F
-240 to -150
±1.2 to ±0.4
-150 to -100
±0.4
-100 to 20
±0.3
20 to 1000
±0.2
B2
310°C – 1820°C
590°F – 3308°F
310 to 595
±1.8 to ±1.0
595 to 830
±0.9
830 to 965
±0.7
965 to 1820
±0.6
N2
-230°C – 1300°C
-382°F – 2372°F
-230 to -150
±1.6 to ±0.7
-150 to -50
±0.5
-50 to 215
±0.3
215 to 1300
±0.2
R2
-15°C – 1768°C
5°F – 3214°F
-15 to 100
±1.2 to ±0.8
100 to 240
±0.7
240 to 495
±0.6
495 to 1768
±0.5
S2
-20°C – 1768°C
-4°F – 3214°F
-20 to 75
±1.2 to ±0.9
75 to 150
±0.8
150 to 285
±0.7
285 to 1768
±0.6
G2
100°C - 2315°C
212°F – 4199°F
100 to 240
±1.0 to ±0.6
240 to 310
±0.5
310 to 460
±0.4
460 to 2315
±0.3
C2
0°C – 2315°C
32°F – 4199°F
0 to 60
±0.5
60 to 2200
±0.4
2200 to 2315 ±0.5
D2
0°C – 2315°C
32°F – 4199°F
0 to 100
±0.6 to ±0.5
100 to 230
±0.4
230 to 2315 ±0.3
2Thermocouple types B, N, R, S, C, D, G, P, L and U are model CL945A only.

Instrument Description
1-3
P2
0°C to 1395°C
32°F to 2543°F 0 to 1395 ±0.3
L2
J-DIN
-200°C - 900°C
-328°F – 1652°F
-200 to -90
±0.6 to ±0.4
-100 to -40
±0.4
-40 to 655
±0.3
655 to 665
±0.4
665 to 900
±0.3
U2
T-DIN
-200°C – 600°C
-328°F – 1112°F
-200 to -75 ±0.8 to ±0.5
-75 to 0
±0.4
-0 to 385
±0.3
385 to 600
±0.2
Connector Type
Two (2) Mini-TC Copper
Temperature Units
°C, °F, mV
Probe Zero Function
Resolution 0.1 °C/°F
Reading Rate
3/sec. for Readings and TREND indicators
Battery Type
3 AA (IEC LR6, ANSI 15) Alkaline
Battery Life
500 Hours Typical
Battery Indicator
Four (4) Stage Battery Charge Indicator
Display
Two (2) rows of Five (5) digit LCD with separate minus
sign, decimal indicators, with offset, thermocouple types
KJTEBNRSGCDPLU, battery, source, read, temperature
units, voltage units, percent, trend, PRST (0-19), MIN,
MAX, AVG, RNG, STDEV, Transfer, symbols: Fast Ramp,
Slow Ramp, Step, Bluetooth
Statistics
Minimum Reading, Maximum Reading, Average Reading,
Reading Range, Standard Deviation
Display Backlight
Four (4) LED Backlight with 30-second timeout
Display Resolution
0.01° <1000 °
.1° ≥ 1000 °
Auto Off
20 minute no key pressed Auto Off. Feature can be
disabled
Keypad
Twelve (12) momentary switches with audible and tactile
feedback
Power Cycle
Configuration
Retention
Instrument retains: Sensor Type, Temperature Unit
Offset Values, Presets, Statistics, Open Lead detection
status, 0%/100% span settings, and operating mode
Internal Preset Storage
20 Preset user-determined storage registers, 0-19

Instrument Description
1-4
Input Current
±50 nA maximum
Maximum Common
Mode Voltage 42 V peak to earth 1 V p-p between T1 and T2
Low Resistance Load
Less than 5µV change in output with a 100KΩ resistance
Operating
Environment
Operating Temp
-20 to 55 °C
-4 to 131 °F
Storage Temp
-51 to 71 °C
-59.8 to 159.8 °F
Humidity
<10 °C (50 °F): Non-condensing
10 to 30 °C (50 to 86 °F): 5 to 95% RH
30 to 40 °C (86 to 104 °F): 5 to 85% RH
40°C to 55°C (104 to 131 °F): 5 to 60% RH
Altitude
0 to 4600 m
0 to 15,092 ft
Vibration
Random 10 – 500 Hz, 0.03 g2/Hz
Shock
30g Half Sine
Drop
4 Drops from 1 m to Concrete
Compliance, Electrical
CE, MIL-PRF-28800F Class 2
Compliance,
Substances RoHS 2 Directive, 2011/65/EU Compliant, REACH
Electrical Safety
IEC-61010
EMC
EN 61326, MIL-PRF-28800F, Class 2
ESD
IEC 61326 Criterion B
Sanitation
NSF/ANSI/3-1 14159-2
Standards
MIL-PRF-28800F, Class 2
Temperature
Coefficient
For specification variances due to ambient operating temperature,
see the Expanded Instrument Uncertainty charts in Appendix Bof
this manual. For ambient operating temperatures not shown in
Appendix B, accuracies shall be interpolated linearly.
Included Accessories
3 AA Batteries, Quick Start Guide, Tilt Stand/Magnetic,
Calibration Report
P
HYSICAL
CHARACTERISTICS:
Dimensions
193 x 84 x 28 mm
7.6 x 3.3 x 1.1 in
Weight including
Batteries 362.9g 12.8 oz.

Instrument Description
1-5
OMEGA Family of Thermometers
Thermocouple
Thermometers
HH911T
Thermocouple Thermometer, Single Input
HH912T
Thermocouple Thermometer, Dual Input
Data
Thermometers
HH931T
Data Thermometer, Single Input
HH932T
Data Thermometer, Dual Input

Preparation for Use
2-1
2. PREPARATION FOR USE
General Information
This manual provides operating instructions and maintenance information for two calibrator
instruments, CL940A and CL945A. These instruments are high performance calibrator-
thermometers capable of simulating and measuring a wide-variety of sensors. In addition,
features such as high accuracies, preset storage, ramp, step and transfer modes further
enhance their versatility.
It is recommended that you read this manual thoroughly, especially the sections on safety,
prior to operating these instruments.
Feature Overview
•0.01° / 0.1 ° display resolution
•Internal storage for 20 presets
•500-hour battery life3
•Five (5) digit dual LCD with LED Backlight
•Simultaneous Source/Measure
•Comprehensive real-time statistics: MIN, MAX, AVG, RNG, and STDEV
•Easy to clean
•Probe offset function to minimize probe error
•°F, °C, and mV temperature and voltage units
•Durable: Meets MIL-PRF-28800F, Class 2 requirements
•Tilt Stand/Magnet/Hanger
3Typical battery life under normal use conditions in laboratory environment. Continuous or repeated use of
features such as the backlight or use or storage at high or low temperature extremes may reduce battery life.

Preparation for Use
2-2
Safety Notices and Information
Read this Operation Manual thoroughly before using the instrument to become familiar with its
operations and capabilities.
Visually inspect instrument before using. Do not use if unit appears damaged or with any part of the
case removed.
WARNING
MAINTENANCE INSTRUCTIONS WITHIN THIS MANUAL ARE FOR USE BY QUALIFIED SERVICE
PERSONNEL ONLY. DO NOT ATTEMPT TO SERVICE THIS UNIT UNLESS YOU ARE QUALIFIED TO DO
SO.
SHOCK HAZARD
Disconnect all temperature probes and turn the unit off before removing the battery cover.
Never connect thermocouple leads to any source where more than 42 Volts (peak) could exist
between the lead and ground. If it is necessary to make measurements of an object at elevated
electrical potential, the user is responsible for obtaining and properly using a probe that provides
adequate insulation between the surface with elevated potential and the thermocouple wiring.
Always disconnect probe leads before opening the battery door or the instrument housing.
Internal circuits can present a shock hazard if leads are connected to a source of elevated potential.
Do not use this instrument if the housing, probe wiring, probe, or probe handle are damaged
or distorted. Housings and wire insulation are part of the personnel protection system, and if damaged
could expose users to elevated potentials.
EXPLOSION HAZARD
Never use or store this product with batteries installed, or change batteries, in an
environment where explosive or flammable vapors or dust suspensions may exist. For
thermocouple thermometers suitable for use in explosive environments, see Error! Reference source
not found.’s 921A or 922A Intrinsically Safe Thermometers.
Do not attempt to recharge alkaline batteries.
Do not put batteries into bags designed to protect parts from electrostatic discharge (ESD).
These bags are specially designed with metal shielding which can short circuit a battery.
Do not expose batteries to extreme heat or fire. Observe all regional laws and regulations when
disposing batteries.
Never use this instrument or any temperature probe or sensor inside a microwave oven.
BURN HAZARD
Do not touch a temperature probe sheath that has been exposed to toxic substances or
extremely high or low temperatures.
Do not attempt to measure temperatures beyond the range of the temperature probe. Probe
damage or personal injury could result from exceeding a probe’s maximum temperature rating.
Safety Notices and Information continued on next page . . . .