OMEGA CL940A User guide

TM

User’s Guide

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SM

CL940A, CL945A

Digital Temperature

Calibrator–Thermometer

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for Process Measurement and Control?

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TEMPERATURE

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Wire: Thermocouple, RTD & Thermistor

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Rotameters, Gas Mass Flowmeters & Flow Computers

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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. INSTRUMENT DESCRIPTION

Source/Measure

R

0.01°C

999.99°C

0.1°C ≥ 1000°C

R

-15MV

V

C

±0.15°C

5-D

(0.1/0.01)

A

28°C (64.4

82.4°F) | CJC error included

ITS-90

Types B,E,J,K,N,R,S,T

DIN 43710

Types L and U

ASTM E1751 5.1.2

Type P

Temperature Ranges

°C Range

°C

-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

-200 to -160

±0.7 to ±0.5

-160 to -110

±0.4

-110 to 10

±0.3

10 to 1200

±0.2

-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

Specifications

Accuracy

ESOLUTION

ANGE

OLD JUNCTION ERROR

DISPLAY

CCURACY1 OVER RANGE OF 18 TO

±0.003% * [READ ING] ± 5µV 18° TO 28°C

FUNCTION

EN 60584-1 2013 Type C

UP TO

TO 85M

IGIT AUTO-RESOLUTION

ANNUNCIATORS

TO

AND

1

WITH BACKLIGHT AND

Conformity

K

-230°C - 1372°C

-382°F - 2502°F

J

-200°C - 1200°C

-328°F – 2192°F

T

-260°C – 400°C

-436°F – 752°F

ASTM E988 Table 3 Type D

ASTM E1751 5.1.1 Type G

1

See Graphs in Appendix B for Expanded Uncertainties

1-1

Instrument Description

E

-240 to -150

±1.2 to ±0.4

-150 to -100

±0.4

-100 to 20

±0.3

20 to 1000

±0.2

310 to 595

±1.8 to ±1.0

595 to 830

±0.9

830 to 965

±0.7

965 to 1820

±0.6

-230 to -150

±1.6 to ±0.7

-150 to -50

±0.5

-50 to 215

±0.3

215 to 1300

±0.2

-15 to 100

±1.2 to ±0.8

100 to 240

±0.7

240 to 495

±0.6

495 to 1768

±0.5

-20 to 75

±1.2 to ±0.9

75 to 150

±0.8

150 to 285

±0.7

285 to 1768

±0.6

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 to 60

±0.5

60 to 2200

±0.4

D2

0 to 100

±0.6 to ±0.5

100 to 230

±0.4

-240°C – 1000°C

-400°F – 1832°F

2

B

310°C – 1820°C
590°F – 3308°F

N2

-230°C – 1300°C

-382°F – 2372°F

R2

-15°C – 1768°C
5°F – 3214°F

S2

-20°C – 1768°C

-4°F – 3214°F

G2

100°C - 2315°C
212°F – 4199°F

0°C – 2315°C
32°F – 4199°F

2200 to 2315 ±0.5

0°C – 2315°C
32°F – 4199°F

230 to 2315 ±0.3

2

Thermocouple types B, N, R, S, C, D, G, P, L and U are model CL945A only.

1-2

Instrument Description

P2

0°C to 1395°C

-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

-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

Two (2) rows of Five (5) digit LCD with separate minus

Minimum Reading, Maximum Reading, Average Reading,

Display Backlight

Four (4) LED Backlight with 30-second timeout

Display Resolution

0.01° <1000 °

.1° ≥ 1000 °

20 minute no key pressed Auto Off. Feature can be

Twelve (12) momentary switches with audible and tactile

Power Cycle

Instrument retains: Sensor Type, Temperature Unit

Internal Preset Storage

20 Preset user-determined storage registers, 0-19

32°F to 2543°F

L2

J-DIN

-200°C - 900°C

-328°F – 1652°F

0 to 1395 ±0.3

U2

T-DIN

-200°C – 600°C

-328°F – 1112°F

Display

Statistics

Auto Off

-200 to -75

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

Reading Range, Standard Deviation

disabled

±0.8 to ±0.5

Keypad

Configuration
Retention

feedback

Offset Values, Presets, Statistics, Open Lead detection
status, 0%/100% span settings, and operating mode

1-3

Instrument Description

Input Current

±50 nA maximum

Maximum Common

Mode Voltage

Low Resistance Load

Less than 5µV change in output with a 100KΩ resistance

Operating

Operating Temp

-20 to 55 °C

-4 to 131 °F

Storage Temp

-51 to 71 °C

-59.8 to 159.8 °F

<10 °C (50 °F): Non-condensing

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,
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

For specification variances due to ambient operating temperature,

3 AA Batteries, Quick Start Guide, Tilt Stand/Magnetic,

P

Dimensions

193 x 84 x 28 mm

7.6 x 3.3 x 1.1 in

Weight including

Environment

42 V peak to earth 1 V p-p between T1 and T2

Humidity

Substances

Temperature
Coefficient

Included Accessories

HYSICAL

CHARACTERISTICS:

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

RoHS 2 Directive, 2011/65/EU Compliant, REACH

see the Expanded Instrument Uncertainty charts in Appendix B of
this manual. For ambient operating temperatures not shown in
Appendix B, accuracies shall be interpolated linearly.

Calibration Report

Batteries

362.9g 12.8 oz.

1-4

Instrument Description

OMEGA Family of Thermometers

Thermocouple Thermometer, Single Input

Thermocouple Thermometer, Dual Input

Data Thermometer, Single Input

Data Thermometer, Dual Input

Thermocouple

Thermometers

Data

Thermometers

HH911T

HH912T

HH931T

HH932T

1-5

Preparation for Use

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 calibrator­thermometers 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 life

• 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

3

3

Typical 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.

2-1

Preparation for Use

SO.

could expose users to elevated potentials.

Never use this instrument or any temperature probe or sensor inside a microwave oven.

damage or personal injury could result from exceeding a probe’s maximum temperature rating.

Safety Notices and Information

Read this Operation Manual thoroughly before using the instrument to become familiar with its

Visually inspect instrument before using. Do not use if unit appears damaged or with any part of the

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

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

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.

operations and capabilities.

case removed.

WARNING

SHOCK HAZARD

EXPLOSION HAZARD

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

Safety Notices and Information continued on next page . . . .

2-2

Preparation for Use

RISK OF INSTRUMENT DAMAGE

care to avoid static discharge when handling the instrument or connected probes.

Do not use when AC or DC voltages in excess of 1V exist between thermocouple channels (on
instruments with more than one channel). Excessive voltage could result in an incorrect reading,

or in more extreme cases, a blown fuse that will result in incorrect readings and need for repair.

Only replace batteries with size AA (IEC LR6, ANSI 15). Observe proper polarity when installing
batteries. Do not mix old and new batteries.

Do not apply voltages across thermocouple leads in excess of normal thermocouple voltage
for the selected range. Excessive input voltage could result in blown fuse, component damage, or

fire. Application of excessive voltage is not covered by the warranty.

Avoid making sharp bends in probe or sensor lead wires. Bending lead wires at sharp angles can
damage the wire and cause probe failure.

When using both thermometer inputs and a voltage differential exists between the two
measurement points, at least one probe should be electrically insulated. If not, a ground-loop

current can flow through the thermocouple leads causing measurement error or instrument damage.

Static discharge through a connected temperature probe may cause instrument damage. Use

RISK OF INCORRECT READING

CAUTION

2-3

Preparation for Use

Always turn the instrument off and disconnect any input connections before replacing

instrument.

to the instrument.

Unpacking and Inspection

Each instrument is electrically and mechanically inspected before shipment. Upon receiving
your new OMEGA Data Thermometer, unpack all items from the shipping container and
check for any obvious damage that may have occurred during transit. Use the original
packing materials if reshipment is necessary.

If any dents, broken, or loose parts are seen, do not use the equipment. Notify OMEGA
immediately.

Check that all items are present. If any items are missing, notify OMEGA immediately.

The following items are included with every new instrument:

• One (1) Calibrator Thermometer;

• One (1) Quick Start Guide;

• Calibration Report;

• Three (3) AA, 1.5 V batteries; and

• Optional accessories (if purchased).

Battery Installation and Replacement

Three (3) AA 1.5 V batteries are supplied with the instrument, but not installed. Read the
following battery replacement instructions before attempting to install or remove the
batteries.

CAUTION

CAUTION

CAUTION

the batteries. Re-install the battery compartment cover before resuming use of the

The battery compartment is sealed with a rubber gasket. Use care to not damage the
gasket when removing or installing the battery compartment cover.

Remove the batteries when storing the instrument for an extended period of time or
in a high temperature environment to prevent battery leakage and possible damage

All measurement parameters may be reset to factory default if batteries are removed while
the instrument is powered on. Always turn the instrument off before changing batteries.

To install or replace batteries:

Required Tools: Phillips Head Screwdriver

1. Identify the battery compartment located on the back of the instrument (see
Figure 1 below);

2. Remove the two (2) battery compartment retaining screws;

3. Remove the battery compartment cover;

4. If present, carefully remove old batteries being careful to not damage the battery
contacts;

2-4

Preparation for Use

Retaining
Screws

Battery

Gasket

5. Observing proper polarity, install three (3) new, AA alkaline (IEC LR6, ANSI 15)
batteries;

6. Re-install the battery cover and two (2) retaining screws;

7. At initial power on after battery replacement, allow approximately 30 seconds for
instrument to stabilize.

Compartment

Figure 1: Battery Installation

Initial Power ON

OMEGA’s 900 Series Calibrator Thermometers are designed for easy operation, while still
providing a feature-rich experience via the intuitive user interface.

To get started follow these steps:

1. Perform Section 2.5, Battery Installation and Replacement;

2. The instrument will initially display every segment on the LCD for 2 seconds as a
test. An internal hardware, memory and battery self-test is performed during this
time.

3. Upon completing the internal tests, the instrument will immediately display the
Source and Read mode last user settings and battery indicator.

4. Set the desired measurement parameters as follows:

a. Enter the Setup Menu by pressing , hold the key down for

approximately 1.5 seconds, and then release it;

b. The active thermocouple type is flashing on the display. Use or

to select the desired thermocouple type. You are setting the

thermocouple type of the Read Channel.;

2-5

Preparation for Use

desired digit or changing the mode.

The arrows always change a value. The arrows position
the cursor or will act to select only when changing Thermocouple type,

c. Momentarily (do not hold) press to save your selection and move to

the next parameter;

d. The active temperature unit is flashing on the display. Use to

select the desired temperature unit (°C, °F, or mV);

e. Momentarily press to save your selection and move to the next

parameter;

f. Read Channel 2 offset value is flashing on the display. If the

temperature probe’s offset value is known, press to set the
Channel 2 probe offset to the probe’s offset value. See Section 3.10,
Probe Offset, for more information.

g. Momentarily press to save your selection and move to Open Lead

Detection, press to toggle on/off;

h. Momentarily press to save your selection and move to Source on/off;

See Section 3.3, Set Up, figure 4 for more information.

i. To save the current parameter value and exit the Setup Menu, press ;

j. To disregard changes made to the current parameter value and exit the

Setup Menu, press .

2-6

Operating Instructions

Power instrument ON or OFF and exits Key
Lock mode.

While in Setup Menu, save current value and
step to next parameter

While in Setup Menu, discard all unsaved
changes and exit menu

Delete all saved measurement data and

memory, MIN/MIX/AVG/RNG/STDEV

While in PRST selection mode with PRST flashing, erases current preset
number contents

Displays in order: Current Source Channel reading, MIN, MAX, AVG, RNG,
STDEV

While displaying Cold Junction Compensation (CJC) reading, toggles between
CJC 1 and CJC 2

The 10%/90% key toggles between 10% and 90% of span. The first press
of the key goes to 10%.

The 0%/+25% key manually increments the output by 25% of the defined

the key will wrap around to 0%.

Once in Preset, single press saves and exits leaving the selected preset
number active

Left and Right Buttons: Move active Source digit indicator by 1 place left or
right.

Figure 2 Keypad Button Functional Description

3. OPERATING INSTRUCTIONS

Keypad Functions

The instrument keypad is a twelve (12) key, sealed membrane keypad. Each key provides
audible and tactile user feedback when pressed. Key functions are described in Figure 2
below.

Disable auto-power OFF

(1.5s)

Enter instrument Setup Menu

(1.5s)

Toggle display backlight

Disable backlight 30-second timeout

(1.5s)

(1.5s)

(1.5s)

(1.5s)

The , , , and keys have multiple functions which can be accessed by
momentarily pressing the key, or alternatively, by pressing and holding the key for

While in Setup Menu, save changes and exit menu

Displays Cold Junction Compensation (CJC) readings.

span for the selected TC. Once the output reaches 100% the next press of

Enters the Preset selection mode

Up and Down Buttons: Increment/Decrement currently selected Source digit
by 1.

reset all statistics currently stored in

(1.5s)

3-1

Operating Instructions

OFFSET is

Line 2

Source

digit display

The active

type

Remaining
battery life

Temperature
units

Active Digit
Indicator

milliVolt
designation

population formula) over the last 1000 measurement cycles.

Transfer is active. TRANSFER mode reads the input TC and outputs an offset

reading using the same user settings.

approximately 1.5 seconds. Throughout this Operation Manual, the press and hold sequence

(1.5s)

is indicated by the key designator followed by the subscript (1.5s). For instance,

indicates that the key should be pressed and held for 1.5 seconds, then released to
access the desired function.

LCD Display

The display is a large, easy to read, dual LCD display, with an LED backlight for clear
viewing in low-light conditions. It simultaneously displays Source channel and Read channel
values, current thermocouple type and temperature unit, Source and Read channel labels,
trend indicators for the Read Channel and a battery voltage indicator.

In Statistics View, the initial value displayed is a mirror of the Source channel. Each press
of the View key after that displays the active statistic result and its corresponding label
below. See Figure 3 below for further description of each display indicator.

applicable to

1

Reading in

2

Channel 5

3

thermocouple

4

5

9 Value displayed in Read Channel display is a percentage

Value displayed in the Read Channel is the Standard Deviation (using total

10

Flashing: Broadcasting to pair with a device

4

11

Solid On: Bluetooth connection has paired

12

corrected mV signal to an upstream TC input. Source output is matched to the

4

Bluetooth symbol on LCD reserved for future models.

3-2

6

7

Read

8

Channel 5
digit display

Operating Instructions

MAX statistic. Displays the maximum reading over the last 1,000 measurement
cycles.

0°C. The ramp rate is 5°C per second.

MIN statistic. Displays the minimum reading over the last 1,000 measurement

Fast Ramp: Source Channel continuously cycles from 0°C to Span and then back to
0°C. The ramp rate is 50°C per second.

type if in mV), Units, Mode, Span (0% and 100%), and preset number.

Over Range: The applied temperature is greater than the maximum
temperature for the selected thermocouple type

Under Range: The applied temperature is less than the minimum
temperature for the selected thermocouple type

13 Range is currently displayed, the MAX minus MIN value.

Instrument is displaying the Average reading over the last 1000 measurement

14

cycles.

Step Function: There are 10 equal steps between 0°C and Span. Source

15

continuously steps up and down. There is a 5 second dwell time on each step.

16

Slow Ramp: Source Channel continuously cycles from 0°C to Span and then back to

17

18

cycles.

19

20 Displays the number of the current 20 possible presets, (0-19).

PRST: Preset is active. Each preset value includes Source Value, TC Type, (no TC

21

22 Trend Indicators, Read channel.

23 Minus sign, Read channel.

24 Read channel Label.

25 Minus sign, Source channel.

26 Source channel Label.

Figure 3: LCD Display Description

The LCD can display error information about the current measurement, as shown in Figure

4.

D

ISPLAY DESCRIPTION

OPEn No thermocouple probe is connected

O rnG

U rnG

Figure 4: LCD Error Indications

3-3

Operating Instructions

Setup Menu

Key designators followed by (1.5s), e.g.
pressed and held for 1.5 seconds, then released to access the desired function.

Measurement settings are configured in the Setup Menu. Press

Menu. From within the Setup Menu, press to step through the user-definable parameters

and the keys to increment/decrement or
Setup Menu. The active parameter value will flash on the display or the active digit indicator
will flash beneath the digit.

Press to save a setting and exit the Setup Menu. Press to disregard unsaved changes
and exit the Setup Menu. If no key is pressed for 10 seconds, the current configuration is
saved and the instrument will exit the Setup Menu.

Figure 5 lists the user-definable parameters and the available values for each parameter.

To set a parameter value:

or ;

(1.5s)

;

(1.5s)

to enter the Setup Menu;

1. Press

2. Press to cycle through parameters as shown in Figure 6 until the desired
parameter is reached;

3. To change the value of the current parameter, press

4. To save the current parameter value and cycle to the next parameter, press

5. To save the current parameter value and exit the Setup Menu, press ;

6. To disregard changes made to the current parameter value and exit the Setup

Menu, press .

7. If parameter 2, “Temperature and Voltage Units” are set as either “°C” or “°F”, the
remaining parameter choices available are in Figure 5 below under “Setup Choices
for °C and °F”. If parameter 2 is set to “mV”, the remaining parameter choices
available are in Figure 5 below under “Setup Choices for mV”.

(1.5s)

, indicate that the key should be

(1.5s)

to access the Setup

keys to move left/right while in the

STATS

are not active in mV mode.

3-4

Operating Instructions

Temperature and
voltage Units

(old)

blinking

voltage Units

(old)

SETUP MENU CHOIC ES FOR °C AND °F

PARAMETER AVAILABLE VALUES

Thermocouple Type5 K, J, T, E

°C, °F, mV

Probe Offset ±0.1 ° increments

Open Lead detection

On / Off

Source (SourC) On / Off

If on – Set Span

If on – Set Mode

SETUP MENU CHOIC ES FOR MV

PARAMETER

Thermocouple Type

Temperature and

Probe Offset

Open Lead detection

Source (SourC)

If on – Set Span

Set 100% Level

Set 0% Level

Manual

Fast Ramp

Slow Ramp

Step

Transfer

AVAILABLE VALUES

6

K, J, T, E

°C, °F, mV

±0.1mV increments

On / Off

On / Off

Set 100% Level

5

“__ __ __ __ ”

5

The CL945A includes K,J,T,E,B,N,R,S,G,C,D,P,L,U

6

All though still selectable, TC type is not visible on LCD while mV is the active unit

3-5

Operating Instructions

Range Hi mV (default)
[-15mV to +85mV]

Range Lo mV7
[-15mV to +35mV]

blinking

D
INDICATOR

Minimum temperature recorded during current
session

Maximum temperature recorded during current
session

Average of all temperatures recorded during
current session

Standard deviation of all temperatures recorded
during the current session1.

Set 0% Level

Range (rAnGE)

Manual

(mV flashing)

“__ __ __ __”

Fast Ramp

If on – Set Mode

Slow Ramp

Step

Transfer

7

Low range is for calibration verification only.

Figure 5

If no key is pressed for 10 seconds, the instrument will save the current configuration
and exit the Setup Menu.

View Modes and Statistics

The instrument features multiple view modes including a variety of real-time statistics, all
available at the touch of a button. Figure 6 below describes each view mode.

VIEW MODE

Minimum MIN

Maximum MAX

ISPLAY

DESCRIPTION

Average AVG

Range RNG Maximum minus Minimum

Standard Deviation STDEV

1

Standard Deviation is calculated using the population formula:  =

Figure 6: View Modes and Statistics

3-6

2

∑

(−µ)

�



Operating Instructions

results and initiate a new statistics session.

M

S

S

Value from

channel

Press to change view modes. For each mode, the active measurement or statistic result
is displayed on the second line of the display.

When viewing statistics, the active statistic is indicated directly below the result.

Statistics are calculated continuously, beginning when the instrument is powered on or when

(1.5s)

is pressed.

It is important to note that changing parameter values or temperature probes will invalidate

(1.5s)

the current statistics session. When using statistics, always begin by pressing
delete existing statistics data and initiate a new statistics session.

Press to step through the available statistics. Statistics are displayed in the order shown
in Figure 7 below.

to

When using statistics, always begin by pressing

(1.5s)

to clear existing statistics

The first line of the display indicates the current Source Channel value, regardless of
which view mode statistic is currently displayed.

ODEL

OURCE

TATISTIC VIEW SEQUENCE

CHANNEL

CL940A/
CL945A

source

MIN MAX AVG RNG STDEV

Figure 7: Statistics Sequence

If the instrument records invalid measurement data during the statistics session such as an
over-range, under-range, or open input value, ————— will be displayed for each affected
statistic result.

To return to the active measurement mode, press repeatedly to step through the
remaining view modes, or cycle power.

Auto-Power Off

Key designators followed by (1.5s), e.g.
pressed and held for 1.5 seconds, then released to access the desired function.

To conserve battery life, the instrument automatically turns off if no key is pressed for 20

minutes. To disable this feature, press

(1.5s)

once, indicating auto-power off is disabled.

Auto-power off will remain disabled until instrument power is cycled. At next power on,
auto-power off returns to the default enabled condition.

(1.5s)

, indicate that the key should be

. The remaining battery life indicator will flash

3-7

Operating Instructions

D
INDICATOR

Instrument operates by outputting a voltage that

millivoltage.

Instrument Ramps the output temperature or

millivoltage) and clear the fast ramp setting.

Instrument Ramps the output temperature or

millivoltage) and clear the slow ramp setting.

Instrument Ramps the output temperature or

millivoltage) and clear the Step ramp setting.

Instrument sets the source output (temperature

“Transfer” icon will blink and illuminate if selected.

Backlight and Backlight Timeout

The instrument includes an LED backlight feature to ensure measurement data can be easily

read in low-light conditions. To activate the backlight, press .

Once the backlight is activated, it will automatically turn off after 30 seconds if no key is

(1.5s)

pressed to preserve battery life. To disable the backlight timeout feature, press
backlight will flash to indicate the timeout feature has been disabled. To re-enable the

backlight timeout feature, turn the backlight off then on by pressing twice.

. The

Operating Modes

The instrument has five (5) operating modes for channel one, “Source” including manual
operation explained in Figure 8 below. The operating modes are Manual, Fast ramp, slow
ramp, step and transfer.

OPERATING MODE

Manual

Fast Ramp

Slow Ramp

Step

Transfer

ISPLAY

blinking

“__ __ __ __”

DESCRIPTION

corresponds to the set temperature or

millivoltage from 0% of span to 100% of span and
back to 0% of span in 20 seconds. This repeats
until stopped. Any other key press will stop the
output at the existing value (temperature or

millivoltage from 0% of span to 100% of span and
back to 0% of span in 120 seconds. This repeats
until stopped. Any other key press will stop the
output at the existing value (temperature or

millivoltage from 0% of span to 100% of span and
back to 0% of span stepping at 10% increments,
dwelling 5 seconds at each step. This repeats
until stopped. Any other key press will stop the
output at the existing value (temperature or

or millivoltage) equal to the value on the “Read”
channel, (channel 2). This is an offset corrected
value. SOURCE output = READ voltage + CJC
voltage. This mode would be used for
troubleshooting systems and readouts. The

Figure 8: Operating Modes

3-8

Operating Instructions

While in any of the Operating Modes above, unless Auto Power Off was disable, the
instrument will automatically turn off if no key is pressed for 20 minutes.

Trend Indicators

Trend indicators provide a visual representation of the measurement’s stability, and are
provided for the Read channel. An up arrow indicates that the current measurement is
trending upwards, while a down arrow indicates the measurement is trending downwards.
The trend indicators code looks for a greater than, plus or minus 0.1 degree change in 5
seconds. It will then light the up or down arrow based on which way the temperature is
moving. If the temperature change for the last 5 seconds is less than 0.1 degrees, the
indicators will go off. Neither arrow is visible when the measurement is stable. For best
accuracy, always allow the measurement to stabilize before evaluating or recording the
measured temperature.

Battery Indicator

Battery depletion or battery replacement will reset all measurement parameters to
their default values and deletes all existing statistics data. After battery replacement,
set measurement parameters as required.

The battery voltage indicator provides a visual representation of approximate remaining
battery life. It is located at the top-right of the
display.

The battery voltage indicator uses three bars
to represent remaining battery life. Figure 9
shows the approximate battery life for each
bar.

At zero (0) bars, the instrument will display
“Chang Bttry” for 30 seconds and then
initiate a shutdown sequence. To prevent
disruption of the measurement process and
statistics and data collection, the batteries
should be replaced before the battery voltage
indicator reaches zero (0) bars. See Section 2.5, Battery Installation and Replacement.

BARS APPROX. BATTERY LIFE

3 100% - 50%

2 50% - 20%

1 20% - 5%

0 0% - Shutdown Initiated

Figure 9: Battery Voltage Indicator

Probe Offset

The probe offset feature compensates for temperature probe errors, significantly improving
overall measurement uncertainty. Probe offset can be set for the Source Channel. Once set,
the probe offset is automatically applied to all subsequent measurements and statistics on
the offset channel.

Current statistics will be invalidated after changing settings such as probe offset. Press

(1.5s)

to delete existing statistics data and initiate a new statistics session.

3-9

Operating Instructions

Probe offset rounding errors may occur if temperature units are changed while a

programmed probe offset after changing temperature units.

Neither trend indicator is

has stabilized.

probe offset is active. When using a probe offset, verify and if necessary correct the

To set the probe offset when using an un-calibrated temperature probe:

1. Connect the temperature probe to the Read Channel of the instrument;

2. Place the probe into a known temperature reference such as a thermowell or ice

3. Allow the temperature probe to stabilize in the ice bath or thermowell by observing

4. Press

5. Press two (2) times to cycle to the

6. Observe the current offset displayed on the top segments of the display, and

7. Press to increment/decrement the currently selected digit until the

8. Press to save the offset value and proceed to Open lead detection or press

9. OFFSET is displayed at the top-left of the LCD display.

To set the probe offset when using a calibrated temperature probe with a known offset:

8

;

bath

the instrument trend indicators for the
Read channel;

(1.5s)

to enter the Setup Menu;

Offset parameter;

current Read value displayed on the second line of the display;

displayed temperature equals the known temperature reference value. Press

to change the digit place;

to save the offset value and exit the Setup Menu.

a. Alternatively, to disregard the new offset value and exit the Setup Menu,

press .

displayed when the
temperature measurement

1. Press

2. Press two (2) times to cycle to the Offset parameter;

3. Observe the current offset value displayed on the first line of the display;

4. Press to increment/decrement the currently selected digit until the

displayed temperature equals the known temperature reference value. Press

8

Probe offset measurement using an ice bath or thermowell should only be performed by personnel trained

and qualified in the use of such instruments and related metrology methods.

(1.5s)

to enter the Setup Menu;

to change the digit place;

3-10

Operating Instructions

5. Press to save the offset value and proceed to Open lead detection or press
to save the offset value and exit the Setup Menu.

a. Alternatively, to disregard the new offset value and exit the Setup Menu,

press .

6. OFFSET is displayed at the top-left of the LCD display.

Open Lead Detection Enable/Disable

Open Lead Detection allows the unit to detect if a thermocouple probe is connected to the
thermometer. This feature is not compatible with some thermocouple calibrators and can
result in measurement instability.

Disabling Open Lead Detection in these situations can significantly improve reading stability.
Once disabled, Open Lead Detection will remain disabled until changed by following
the below steps, or the instrument is powered off.

If no thermocouple probe is connected and Open Lead Detection is disabled, the unit

will not indicate OPEn and may display erratic readings.

To change the Open Lead Detection setting:

1. Press

2. Press three (3) times to cycle to the Open Lead Detection parameter;

3. Press to change the Open Lead Detection setting;

4. Press or to save the Open Lead Detection setting and exit the Setup
Menu.

(1.5s)

to enter the Setup Menu;

a. OLd is displayed on Line 1 of the LCD, and the current Open Lead

Detection status is displayed on Line 2, On/OFF.

a. ON indicates that Open Lead Detection is enabled;

b. OFF indicates that Open Lead Detection is disabled;

a. Alternatively, to disregard the Open Lead Detection setting and exit the

Setup Menu, press .

Clear Function

From active measurement mode, press
new statistics session. The LCD display will indicate CLEAr to confirm the action and return
to active measurement mode.

(1.5s)

to clear the statistics registers and begin a

3-11

Operating Instructions

Pressing
internal memory except for Presets.

From the Setup Menu, press to disregard changes to the current parameter value and
exit the Setup Menu.

(1.5s)

deletes all measurement data currently saved in the instrument’s

Presets: Save, Recall and Erase

There are 20 presets in the instrument numbered 0 – 19. The presets allow the user to save
the parameters chosen during setup. There are 3 preset actions. The user can save, recall
or erase.

When a preset is saved, the current operating options are stored in one of the 20 selected
presets. The operating options include:

• Thermocouple Type

• Units

• Offset

• Open Lead Detection Status

• 100% and 0% Span Settings

• Operating Mode: Fast Ramp, Slow Ramp, Step or Transfer

To save a preset

(1.5s)

Press the
preset number location you want to use to store the current operating options. Press the

. The preset number will start flashing. Use the to move to the

. The current operating options are now saved in the chosen preset location and the

flashing stops.

To recall a preset

Press the button. “PRST” will begin to flash. Use the to move to the desired
saved preset, 0-19. When the desired preset is reached, press the preset button again to
exit. The instrument will only display the numbers where presets are stored. For example:

If there are presets stored in 3 and 10 and all others are empty, in this case the would
only toggle between and display 3 and 10.

To erase a preset

To erase a preset it must first be recalled by following the “To recall a preset” steps above.

(1.5s)

Once the desired preset is recalled, press the

flashing. While the preset number is flashing, press

3-12

. The preset number should now be

(1.5s)

. “CLEAr” will appear on the LCD

Operating Instructions

The current measurement or statistic is over-range for the selected

display.

The current measurement or statistic is under-range for the
selected thermocouple type

A thermocouple, shorted transducer, or other short circuit is
plugged into the Source Channel during startup.

momentarily. The location is now empty and will not appear with any of the saved presets
when trying to recall a preset.

The preset number just erased will still appear on the LCD until moved from that
preset number. Once moved to a different preset, it will no longer appear when
trying to recall a preset.

Invalid Measurement Indications

The LCD display indicates when a measurement or statistic is invalid, as shown in Figure 10
below.

I

NDICATION DESCRIPTION

O rnG

U rnG

OPEn No probe is connected or the probe sensor is faulty

————— Cannot compute a valid statistical result

Short ChAn1

thermocouple type. Also, Instrument is in mV mode, “old” is off
and “Source” is off. Those settings can lead to an Over range

Figure 10: Invalid Measurement Indications

3-13

Service Information

4. SERVICE INFORMATION

Inspection and Cleaning

To extend the life of the instrument, inspect and clean the instrument regularly. Inspect the
instrument for any significant abrasions, cuts, cracks, dents, or other signs of damage on
the case, keypad, and display lens. Inspect the connectors for breaks, dirt, or corrosion.
Ensure all screws are securely fastened, and if equipped, that the tilt stand/magnet/hanger
is in good condition and locks into position properly.

With all screws securely fastened and the battery compartment cover in place, use a damp
cloth or towel to wipe down the instrument. Use care to avoid scratching the display lens.
Mild, non-abrasive detergents may be used providing the instrument is then wiped down
with a clean damp cloth or towel.

Calibration

4.2.1 Verification Procedure

The voltage calibration of the instrument can be verified by checking the mV points noted in
Figure 12 below. A Digital Multi-Meter with suitable accuracy
Copper mini-TC male connectors, with good quality, low-thermals wire. The wire cannot be
tinned.

1. This procedure shall be performed within environmental conditions of 23 ±1 °C
and 5% to 95% RH.

2. The unit under test (“UUT”) shall be acclimated to the Controlled Environment for
a minimum of four (4) hours.

9

is needed along with a set of

3. Disable the auto-power off feature by pressing
indicator will flash once, indicating auto-power off is disabled.

4. Connect a copper daisy-chain from Source Channel 1 to Read Channel 2 and to a
DMM of suitable accuracy

9

Suitable accuracy means a metrology-grade DMM. To achieve mV limits shown in Appendix C, the DMM must

have accuracy equivalent to 30 ppm of reading and 9 ppm of range on the 100mV range.

9

.

4-14

(1.5s)

. The remaining battery life

Service Information

Figure 11

High range: (in mV)

[-15mV to +85mV]

Low range: (in mV)

[-15mV to +35mV]

-13.000

-13.000

-10.000

-10.000

0.000

0.000

5.000

10.000

20.000

30.000

80.000

33.000

83.000

n/a

Figure 12

5. Use the Instrument Verification Data Sheet, Appendix C to verify the
measurements in Figure 12 above.

6. Enter setup mode,
“mV” and rAnGE = “Hi”.

7. Connect the Positive of the Source and Read channels to the positive input of the
DMM. Connect the negative of the Source and Read channels to the negative
input of the DMM.

8. By using the and/or
each value in Figure 12 in the “High range”, notating the result from the DMM on
the “Instrument Verification Data Sheet”, Appendix C in “Source DC Volts Channel
1” “Measurement Result” and “Measure DC Volts Channel 2” “Standard” column.

9. Pass/Fail Criteria:

a) For “Source DC Volts Channel 1”, a PASS result is any “Measurement Result”

value that is equal to or in between the Lower Limit and Upper Limit error
numbers.

(1.5s)

and ensure the following parameters are set: units =

keys, adjust the instrument Source to match

4-15

Service Information

b) For “Measure DC Volts Channel 2”, Calculate the limits of error by

adding/subtracting the value noted in the “Tolerance” column to the value of
the “Standard” column for each setpoint. A PASS result is any “Measurement
Result” value that is equal to or in between the Lower Limit and Upper Limit
error numbers.

10. Enter setup mode,

(1.5s)

and ensure the following parameters are set: units =

“mV” and rAnGE = “Lo”.

11. By using the and/or

keys, adjust the instrument Source to match
each value in Figure 12 in the “Low range”, notating the result from the DMM on
the “Instrument Verification Data Sheet”, Appendix C in “Source DC Volts Channel
1” “Measurement Result” and “Measure DC Volts Channel 2” “Standard” column.

12. Pass/Fail Criteria:

c) For “Source DC Volts Channel 1”, a PASS result is any “Measurement Result”

value that is equal to or in between the Lower Limit and Upper Limit error
numbers.

d) For “Measure DC Volts Channel 2”, Calculate the limits of error by

adding/subtracting the value noted in the “Tolerance” column to the value of
the “Standard” column for each setpoint. A PASS result is any “Measurement
Result” value that is equal to or in between the Lower Limit and Upper Limit
error numbers.

13. To verify the Cold Junction Compensation, (CJC) of the Source, (Channel 1) and
Read, (Channel 2).

14. Place the CL940A in a Controlled Environment
thermometer

11

for one hour to stabilize. Compare CJC readings with the reference

thermometer reading. Display the CJC temperature by pressing

10

along with an accurate

(1.5s)

. The

screen will display “CJC 1” and the current temperature of CJC 1 in °C. Pressing

the key again will display “CJC 2” and the current temperature of CJC 2 in °C.
Notate the results in the “Cold Junction Compensation” section on the Instrument
Verification Data Sheet, placing the Thermometer reading in the “Standard”

column, and the CJC readings in the “Measurement Result” column. Select to
exit.

10

An insulated box inside a calibration lab environment, see Appendix A.

11

An accurate thermometer specification is 2 Sigma uncertainty ≤ .04°C (40mK) at the verification

temperature.

4-16

Service Information

Insulated container with lid for controlled

Position accurate thermometer sensor in

Figure 13

For best results, the instrument keypad is the only part of the instrument that should

environment

15. Calculate the Lower and Upper limits: First add a factory determined offset of

0.06°C to the “Standard” value, then add/subtract 0.11°C from the result. For example:

the thermometer reading stabilized at 23.82°C; add .06°C offset to get 23.88°C, then

determine the upper limit as 23.99°C (23.88 + 0.11), and the lower limit as 23.77°C (23.88

minus 0.11). The CJC values should be no greater than these limits. (NOTE: The 0.11°C
value is derived from the 0.15°C specification minus the .04°C uncertainty of the

temperature measurement device.)

middle of MTC 1 and 2 as shown above

4.2.2 Alignment Procedure

Published temperature uncertainty values can only be achieved if the temperature of
UUT is known within 40mK. Customers performing CJC adjustments in their facility
will need to calculate their own uncertainty.

be touched after the acclimation period inside the controlled environment. The
temperature sensor should not be touched.

1. This procedure shall be performed within environmental conditions of 23 ±1 °C
and 5% to 95% RH.

2. The unit under test (“UUT”) shall be acclimated to the Controlled Environment for
a minimum of four (4) hours. The customer supplied calibrated temperature
measurement device used for CAL 11 and CAL 12 below shall also be acclimated in
the same Controlled Environment simultaneously with the UUT.

3. The equipment listed in Appendix A is required to align the UUT to operate within
the expanded instrument uncertainties for mV values specified in Appendix B.
Customers performing CJC adjustments in their facility will need to calculate their
own CJC uncertainty.

4. Remove the UUT battery door housing to expose the alignment access hole.

4-17

Service Information

Figure 14: Alignment Access Hole
Location

CAL 1

-10.000 mV

CAL 2

80.000 mV

CAL 3

-10.000 mV

CAL 4

80.000 mV

CAL 5

-10.000 mV

CAL 6

30.000 mV

CAL 7

-10.000 mV

CAL 8

80.000 mV

CAL 9

-10.000 mV

CAL 10

30.000 mV

External measured
temperature in °C

External measured
temperature in °C

Figure 15

5. Connect the Positive of the Source and Read channels to the positive input of the
DMM. Connect the negative of the Source and Read channels to the negative
input of the DMM.

6. Press UUT to turn the UUT on. Disable the Auto-Power Off press

CAUTION

Do not apply voltages greater than 83 mV DC to the UUT inputs. Voltages
greater than 83 mV may damage the instrument.

7.

Insert the Straightened Paper Clip through
the alignment access hole and gently press
the calibration enable switch located on the
circuit board to enter CAL mode. See Figure
14 for location.

Temporary calibration values are set to a
gain of 1 and offset of 0 every time
calibration is entered. If the calibration is
accepted and saved without entering new
values, the temporary values are copied to
the system values for use.

Voltage Gain and Offset Alignment

8. The UUT display will indicate as follows:

a. Line 1: “-10.000”

b. Line 2: “CAL 1”

The instrument is now sourcing

-10.000 mV.

9. By using the and/or

keys,
adjust the instrument to match as close as
possible the DMM display voltage. Use the

key to save the settings and advance to
“CAL 2”. Repeat this step to and including
CAL 10.

CAL 11

CAL 12

10. CAL 11 and CAL 12 are used to set the Cold
Junction Compensation, (CJC) of the
Source, (Channel 1) and Read, (Channel 2). These steps require the use of a
customer supplied calibrated temperature measurement device. With the probe as
close as reasonable to the channel 1 CJC, and temperature stabilized, enter the
externally measured temperature in Celsius for channel 1. Repeat this step for
Channel 2, CAL 12. See figure 13 above.

(1.5s)

4-18

Service Information

Statistics)

Unexpected or

Measurement

Set probe offset to correct value

(see Section 3.10, Probe Offset)

11. The device now displays for a 2-digit month. By using the

and/or

calibration being conducted. Press to save and advance to day.

12. The device now displays for a 2-digit day. By using the and/or

keys, adjust the instrument to the 2-digit day for the calibration being

conducted. Press to save and advance to year.

13. The device now displays for a 4-digit year. By using the

and/or

calibration being conducted. Press to save and advance to Tech ID.

14. The device now displays for a technician ID. By using the

and/or keys, adjust the instrument to the calibration technician ID. Select a

value from 0 – 99999 for the calibration technician ID and press to save and
exit.

keys, adjust the instrument to the 2-digit month for the

keys, adjust the instrument to the 4-digit year for the

Troubleshooting

OMEGA’s digital handheld thermometers are designed and built to provide years of
uninterrupted use. In the event the instrument malfunctions or does not perform as
expected, helpful troubleshooting tips are provided below. Figure 14 below lists some of the
more common issues and their resolutions.

S

YMPTOM DESCRIPTION RESOLUTION

Unexpected
reading on
Line 2 of
Display

Erroneous

Statistics View Mode is active

Probe offset is active

4-19

Press to cycle through
statistics views until active
measurement is displayed (see

Section 3.4

for connected temperature probe

View Modes and

Service Information

Observe display trend indicators

(see Section 3.8 Trend Indicators)

Set the thermocouple type as

Menu)

When sourcing from a

Lead Detection is enabled.

See Section 3.11, Open Lead

disable.

power

Shuts down

power on

Replace batteries (see Section

A thermocouple, shorted

Channel during startup.

Remove the shorting device. Be

SYMPTOM DESCRIPTION RESOLUTION

Unresponsive

unexpectedly
or will not

Display shows
“Short ChAn1”
on power up.

Temperature probe has not
stabilized

Instrument is set to the wrong
thermocouple type for the
attached probe

thermocouple simulator, Open

Static discharge through
connected probes

Batteries are low or depleted

transducer, or other short circuit
is plugged into the Source

Figure 16: Common Troubleshooting Issues

and wait for stable measurement

appropriate for the attached
probe (see Section

Detection Enable/Disable to

Press to cycle instrument

2.5, Battery Installation and
Replacement)

sure thermocouple is plugged into
the Read Channel, not Source.

3.3, Setup

Diagnostic Routines and Error Codes

The instrument momentarily activates all display annunciators and segments during startup
to allow for visual inspection of the LCD. Observe the LCD and verify all segments activate.

Internal diagnostic routines are also executed during startup. If any diagnostic routine
detects a malfunction, an error will be displayed as shown in Figure 17 below.

E

RROR CODE DESCRIPTION

Err ADC Analog to digital converter error

Err InP Stuck key or other keypad error

Figure 17: Diagnostic Routine Error Codes

Memory Sterilization

To erase all locally stored measurement data and reset accumulated statistics,

press

Instrument parameters will be retained. Refer to Section 3.3, Setup Menu to set instrument
parameters as desired.

(1.5s)

. See Section 3.12, Clear Function for instructions.

4-20

Service Information

Statement of Calibration

This instrument has been inspected and tested in accordance with
specifications published by OMEGA, Inc.

OMEGA, Inc. certifies the above listed instrument has been inspected and
calibrated and meets or exceeds all published specifications and has been
calibrated using standards whose accuracies are traceable to the
International System of Units (SI) through the National Institute of
Standards and Technology (NIST) or other recognized National Metrology
Institutes.

4-21

Appendices

EQUIPMENT

FUNCTION

RANGE

SPECIFICATION (2-SIGMA)

DC Voltage
Measurement

Measure

junction test.

NOTE: This process requires a set of COPPER mini-TC connectors, with good quality,

Straightened
Paper Clip

Required to access the calibration enable switch. Any rigid wire, approximately 0.8
mm in diameter, may be used.

A. REQUIRED EQUIPMENT

DMM

Calibrated
temperature
measurement
device

Controlled
Environment

Copper Mini­TC Cable

-13mV to 83 mV

ambient
temperature
during cold

Insulated box to create a Controlled Environment; a very stable, low gradient air
bath.

low-thermals wire. These cannot be tinned.

(2) Copper Mini-TC Cables required for Voltage Gain and Offset alignment only. This
cable does not require calibration. See Figure 11 above.

One end shall be terminated with a male miniature copper thermocouple connector for
connection to the UUT. The opposite end shall be terminated with copper connections
appropriate for the DMM.

18°C to 28°C ±40 mK (.04°C)

± (30 ppm of reading + 9 ppm of range)

A-i

Appendices

B. EXPANDED INSTRUMENT UNCERTAINTIES

All uncertainty specifications for all charts are K = 2 unless otherwise noted.

B-i

Appendices

Following graphs show total uncertainty in degrees C (k=2), with operating condition between
18-28 °C unless otherwise noted.

B-ii

Appendices

Thermocouple Type K

B-iii

Appendices

B-iv

Appendices

Thermocouple Type J

B-v

Appendices

B-vi

Appendices

Thermocouple Type T

B-vii

Appendices

B-viii

Appendices

Thermocouple Type E

B-ix

Appendices

B-x

Appendices

Thermocouple Type B

1.6000

1.4000

1.2000

1.0000

0.8000

0.6000

0.4000

0.2000

0.0000

400

436

472

508

544

580

18C - 28C -20C Temp Uncertainty (C), k=2 +55C Temp Uncertainty (C), k=2

616

652

688

724

760

796

832

868

904

940

976

1012

1048

1084

1120

1156

1192

1228

1264

1300

1336

1372

1408

1444

1480

1516

1552

1588

1624

1660

1696

1732

1768

1804

B-xi

Appendices

B-xii

Appendices

Thermocouple Type N

2.0000

1.8000

1.6000

1.4000

1.2000

1.0000

0.8000

0.6000

0.4000

0.2000

0.0000

-270

-229

-188

-147

-106

-65

175899

-24

140

181

222

263

304

345

386

427

468

509

550

591

632

673

714

755

796

837

878

919

960

1001

1042

1083

1124

1165

1206

1247

1288

18C - 28C -20 Temp Uncertainty (C), k=2 +55 Temp Uncertainty (C), k=2

B-xiii

Appendices

B-xiv

Appendices

Thermocouple Type R

B-xv

Appendices

B-xvi

Appendices

Thermocouple Type S

B-xvii

Appendices

B-xviii

Appendices

Thermocouple Type G

B-xix

Appendices

B-xx

Appendices

Thermocouple Type C

B-xxi

Appendices

B-xxii

Appendices

Thermocouple Type D

B-xxiii

Appendices

B-xxiv

Appendices

Thermocouple Type P

B-xxv

Appendices

B-xxvi

Appendices

Thermocouple Type L

B-xxvii

Appendices

B-xxviii

Appendices

Thermocouple Type U

B-xxix

Appendices

PARAMETER

SETPOINT

MEASUREMENT RESULT

LIMITS OF ERROR

UNCERTAINTY

PASS/FAIL

L

LIMIT

U

LIMIT

Source DC Volts Channel 1

High Range -13mV to 83 mV

-13 mV

-13 mV

-13.00498 mV

-12.99502 mV

0.00194 mV

-10 mV

-10 mV

-10.00498 mV

-9.99502 mV

0.00192 mV

0 mV

0 mV

-0.0046 mV

0.0046 mV

0.0019 mV

5 mV

5 mV

4.99525 mV

5.00475 mV

0.00191 mV

20 mV

20 mV

19.99482 mV

20.00518 mV

0.00199 mV

80 mV

80 mV

79.99325 mV

80.00675 mV

0.00306 mV

83 mV

83 mV

82.99317 mV

83.00683 mV

0.00313 mV

Low Range -13mV to 33 mV

-13 mV

-13 mV

-13.00498 mV

-12.99502 mV

0.00194 mV

-10 mV

-10 mV

-10.00498 mV

-9.99502 mV

0.00192 mV

0 mV

0 mV

-0.0046 mV

0.0046 mV

0.0019 mV

10 mV

10 mV

9.99511 mV

10.00489 mV

0.00192 mV

30 mV

30 mV

29.99455 mV

10.00545 mV

0.0021 mV

33 mV

33 mV

32.99446 mV

30.00554 mV

0.00214 mV

PARAMETER

STANDARD

EASUREMENT

RESULT

TOLERANCE

LIMITS OF ERROR

UNCERTAINTY

PASS/FAIL

L

LIMIT

U

LIMIT

Measure DC Volts Channel 2 – The values entered in the “Standard” column below are the DMM readings for

each setpoint.

High Range -13mV to 83 mV

-13 mV

0.005 mV

0.00194 mV

-10 mV

0.005 mV

0.00192 mV

0 mV

0.0046 mV

0.0019 mV

5 mV

0.0048 mV

0.00191 mV

20 mV

0.0052 mV

0.00199 mV

80 mV

0.00675 mV

0.00306 mV

83 mV

0.00675 mV

0.00313 mV

C. INSTRUMENT VERIFICATION DATA SHEET

Model:

Serial Number:

OWER

M

each setpoint. Calculate your Limits of Error by adding/subtracting the value noted in the “Tolerance” column for

OWER

PPER

PPER

EXPANDED

EXPANDED

1

1

C-i

Appendices

Low Range -13mV to 33 mV

-13 mV

0.005 mV

0.00194 mV

-10 mV

0.005 mV

0.00192 mV

0 mV

0.0046 mV

0.0019 mV

10 mV

0.0049 mV

0.00192 mV

30 mV

0.00545 mV

0.0021 mV

33 mV

0.00545 mV

0.00214 mV

CHANNEL

STANDARD

MEASUREMENT RESULT

LIMITS OF ERROR

UNCERTAINTY

PASS/FAIL

L

LIMIT

U

LIMIT

Cold Junction Compensation

°C

°C

°C

°C

1

The estimated expanded uncertainties are based on a standard uncertainty multiplied by a coverage factor K=2,

OWER

Note: The values entered in the “Standard” column below are the Reference Thermometer readings for each
channel. Calculate your Limits of Error by: first add a factory determined offset of 0.06°C to the “Standard” value,
then add/subtract 0.11°C from the result to determine upper/lower limits. See section 4.2.1 paragraph 15 for an
example calculation.

1

2

providing a level of confidence of approximately 95%

2

Published temperature uncertainty values can only be achieved if the temperature of UUT is known within 40mK.

Customers performing CJC adjustments in their facility will need to calculate their own CJC uncertainty.

PPER

EXPANDED

2

C-ii

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’s WARRANTY adds
an additional one (1) month grace period to the normal three (3) years product warranty to
cover handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone
or written request. Upon examination by OMEGA, if the unit is found to be defective, it
will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects
resulting from any action of the purchaser, including but not limited to mishandling, improper
interfacing, operation outside of design limits, improper repair, or unauthorized modification.
This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows
evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture
or vibration; improper specification; misapplication; misuse or other operating conditions
outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes
liability for any damages that result from the use of its products in accordance
with information provided by OMEGA, either verbal or written. OMEGA warrants
only that the parts manufactured by the company will be as specified and free of
defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY
KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL
IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION
OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the
total liability of OMEGA with respect to this order, whether based on contract,
warranty, negligence, indemnification, strict liability or otherwise, shall not exceed
the purchase price of the component upon which liability is based. In no event shall
OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1)
as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or
activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or
with any nuclear installation or activity, medical application, used on humans, or misused in
any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER
language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from
any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.

RETURN REQUESTS/INQUIRIES

BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which
the product was PURCHASED,

2. Model and serial number of the product
under warranty, and

3. Repair instructions and/or specific
problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2019 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
the prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS,

consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the

COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems
relative to the product.

omega.com [email protected]

Servicing North America:

U.S.A. Omega Engineering, Inc.
Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

M5725/0219CL940A Rev. A

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains,
and reserves the right to alter specifications without notice.