OMEGA CL541-Plus Manual

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User’s Guide

CL541-PLUS

Automated

Thermocouple Calibrator

®

MADE IN

Shop online at

Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

ISO 9001 Certified

Stamford, CT 06907-0047
Toll-Free: 1-800-826-6342 Tel: [phone]
FAX: [phone] e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec), H7L 5A1 Canada
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA

®

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

®

Engineering Service: 1-800-872-9436/1-800-USA-WHEN

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Mexico En Español: 001 [phone] FAX: [phone]
Latin America [e-mail] e-mail: [e-mail]

Servicing Europe:

Benelux: Managed by the United Kingdom Office

Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Czech Republic: Frystatska 184

733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

France: Managed by the United Kingdom Office

Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26

D-75392 Deckenpfronn, Germany
Toll-Free: 0800 6397678 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified

One Omega Drive, River Bend Technology Centre, Northbank
Irlam, Manchester M44 5BD United Kingdom
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

OMEGAnet®Online Service Internet e-mail

omega.com [e-mail]

It is the policy of OMEGA Engineering, Inc. 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 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, human applications.

Product Description

• Easy to use

With the CL541-PLUS you can check & calibrate all
your thermocouple instruments and measure
thermocouple Sensors. Automatic indication of
connections on the display for simple hookups.

• Take it without into the shop, plant or field

Carry it without worry - it comes protected with a
rubber boot and rugged, low profile switch. Easy to
operate even in the dark areas of the plant with the
backlit display.

• Calibrate directly in temperature (°C & °F)

Stop carrying around a millivolt source and
thermocouple tables. The CL541-PLUS works with
the T/Cs you use including tyes J, K, T & E. Easily set
any value quickly to within 0.1° with the adjustable
digital potentiometer “DIAL” plus store any three
temperatures for instant recall with the Omega
switch.

• Calibrate quickly with automatic output stepping

Choose between 2, 3, 5, 11 and 21 steps to
automatically increment the output in 100%, 50%,
25%, 10% or 5% of span. Select the step time to
match your system from 5, 6, 7, 8, 10, 15, 20, 25, 30
and 60 seconds.

• Compatible with all process instruments

Connect directly to the thermocouple inputs of smart
transmitters, PLCs, DCS and multichannel recorders
and verify their outputs or displays.

NEW

PICTURE

• Measure Thermocouple Sensors

Trouble shoot sensor connections and find broken wires or high resistance junctions. Connect
your sensor and the CL541-PLUS automatically measures the thermocouple in degrees C or F.

Page 1

Basic Operation

CL541-PLUS

HI

322.1

TYPE K °C

AUTOMATED THERMOCOUPLE

CAL IBRATOR

J, T, E, K, mV

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

OVERLOAD

1 OMEGA SWITCH

SOURCE: Instantly output two preset thermocouple

te m per a ture s by mov i ng t he O M EGA swit ch t o
the “LO” position or “HI” position.
point checks select the “DIAL” position. The
CL5 41-PLUS will rememb er the last “DIAL”
value, even with the power off.
These values can easily be changed to suit the
calibration requirements. The temperatures stored in
the HI and LO positions are also used for Auto
Stepping.

READ: Slide the switch to the DIAL position. The
CL541-

PLU S
from the thermocouple sensor. Slide the switch to HI
and the highest temperature measured since turn-on
or reset will be displayed; slide the switch to LO and
the lowest temperature measured since turn-on or
reset will be displayed.

will display the current temperature

READ

Push & Turn

for
Fast Dialing
Push & Hold

to

Store/Ramp

Double Click

for Options

For fast three

2 SOURCE/OFF/READ Switch

Select “SOURCE .stlovillim ro ,F° ,C° ni tuptuo ot ”
Select “READ” to read a thermocouple sensor
or millivolts.

3 PUSH-BUTTON KNOB

SOURCE: Turn
level. Turn clockwise to increase the output,

steps at a time. Push down and turn the
PUSH-BUTTON knob for faster dialing.
Press and hold the knob for two seconds to store
de sire d OM EGA HI/ L O p oint s in SO U RCE
mode. Continue to press and hold the knob for
two more seconds to start the automatic
ramping.

READ: Press and hold to transfer the current
temperature into the Omega switch HI/LO points.
This resets the HI/LO temperature readings
which will update as the temperature changes.

Double click the knob to get into the CL541-

PLU S Configuration Mode. Use configuration to
select °C or °F, T/C Type, Backlight On/Off, Step
Size, Step Time and Auto Off On/Off.

CHANGING BATTERIES

Low battery is indic
Approximately one to four hours of typical
operation remain before the CL541-PLUS will
automatically turn off. To change the batteries;
remove the rubber boot, remove the battery door
from the back of the unit by sliding the door
downward. This allows access to the battery
compartment. Replace with four (4) “AA” 1.5V
batteries being careful to check the polarity.
Replace the battery door and replace the boot. All
stored configuration options (T/C Type,
OMEGA switch Memories, etc., are reset to factory
settings when the batteries are removed.

the knob to adjust the output

ated by “BAT” on the display.

°1.0 ni tuptuo eht esaerced ot esiwkcolc retnuoc

Page 2

N

ote: Alkaline batteries are supplied and

recommended for maximum battery life and
performance.

Configure the Calibrator

Move

2 POWER SWITCH to “SOURCE” or

“READ”.

MODEL CL541-PLUS

DOUBLE CLICK

PUSH-BUTTON KNOB

FOR CONFIGURATION

Configuration

EXIT MENU - exits this menu immediately and
saves any changes. Menu will automatically exit
after 15 seconds of inactivity (countdown timer is
displayed).

TEMP UNITS - pressing the knob will toggle
between °C and °F.

T/C - pressing the knob will cycle through T/C
types J, K, T, E and mV.

Setup

Double click the

3 PUSH-BUTTON knob at any

time the unit is on and the following displays
will appear for 15 seconds:

> EXIT 15
TEMP UNITS °C
T/C K
BACKLIGHT ON

> EXIT 15
STEPS 3
STEP TIME 8
AUTO OFF ON

Turn the

3 PUSH-BUTTON knob to move

through the menu. Press the 3 PUSH-BUTTON
knob to toggle between OFF and ON or to scroll
through the settings.

Basic Operation

Connecting the Calibrator

Thermocouple

Sourcing or reading thermocouples requires the
use of thermocouple or extension grade
thermocouple wire between the CL541-PLUS and
the device being calibrated.
The CL541-PLUS has a female miniature

of the housing for fast, easy connection of wires.

Millivolt
The CL541-PLUS has two banana jacks mounted
in the top end of the housing. These jacks are not
temperature compensated and are to be used
only for generating and measuring millivolt signals.

BACKLIGHT - If BACKLIGHT is ON the
backlight will light all the time the unit is powered
up. For maximum battery life turn the backlight
off when using the calibrator in areas with
enough ambient light to read the display.

STEPS - pressing the knob will cycle through 2,
3, 5, 11 and 21 steps. The endpoints of the steps
are based on the values stored in the HI and LO
OMEGA outputs.

STEP TIME - pressing the knob will cycle
through 5, 6, 7, 8,

9, 10, 15, 20, 25, 30 and 60

seconds.

AUTO OFF - If AUTO OFF is ON, the unit will
turn off after 30 minutes of inactivity to save
battery life. If AUTO OFF is OFF the unit will stay
on until the POWER SWITCH is moved to the off
position.

Note: All settings are remembered even with the
power off. Removing the batteries resets the
values to factory defaults.

Thermocouple Wire

CL541-PLUS

HI

322.1

TYPE K °C

dne pot eht ni detnuom rotcennoc elpuocomreht

AUTOMATED THERMOCOUPLE

CALI BRATOR

J, T, E, K, mV

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

OVERLOAD

Push & Turn

Fast Dialing
Push & Hold

Store/Ramp
Double Click
for Options

READ

for

to

Device

Requiring

Calibration

Page 3

Sourcing Thermocouple

SOURCE

Choose this function to provide a simulated thermocouple signal into controllers, temperature
transmitters, indicators or any input devices that measure thermocouple sensors..

1) Disconnect the thermocouple sensor from the
device to be calibrated.

2) Select “SOURCE” with slide switch

3) Connect a thermocouple wire (matching the type
of wire to sensor being simulated) with miniature
male T/C connector to the inputs of the device
being calibrated, making sure to check polarity.
Millivolt outputs (without cold junction compen­sation) may be connected with a copper (white)
miniature thermocouple connector or through
the banana jacks with cooper wire.

The output is adjusted in 0.1° (or 0.001 mV)
increments by turning the knob
OMEGA swit ch

1 is i n th e “HI”, “LO” or “ SET”

position. Press and turn the knob for faster dialing
with 10°

(or 0.100) increments.

2.

3 while the

CL541-PLUS

HI

322.1

TYPE K °C

AUTOMATED THERMOCOUPLE

CAL IBRATOR

J, T, E, K, mV

SOURCE

MAX

HI

READ

SET

OVERLOAD

OFF

MIN

LO

READ

Push & Turn

Fast Dialing
Push & Hold

Store/Ramp
Double Click

for Options

for

to

The OVERLOAD indicator will light if excessive
voltage or current is detected by the calibrator.

Reading Thermocouple Sensors

READ

Choose this function to measure temperatures with a thermocouple probe or sensor.

1) Disconnect the thermocouple sensor from any other device.

2) Select “READ” with slide switch 2.

3) Place the OMEGA switch into the READ position.

4) Connect a thermocouple probe (matching the type of wire to sensor being measured) with min­iature male T/C connector to the sensor, making sure to check polarity. Millivolt outputs (without
cold junction compensation) may be connected with a copper (white) miniature thermocouple
connector or through the banana jacks with cooper wire.

The CL541-PLUS measures the temperature signal and constantly updates the display with the
current temperature reading. Move the OMEGA switch to MAX to see the highest temperature
reading and to MIN to see the lowest temperature reading. Press and hold the knob

3 to clear the

MAX and MIN readings.

The OVERLOAD indicator will light if excessive voltage or current is detected by the calibrator.

Page 4

Storing OMEGA Switch Outputs

STORING HI and LO OMEGA Switch Outputs

Choose this function to provide a simulated thermocouple signal into controllers, temperature
transmitters, indicators or any other input device that measure thermocouple sensors.

1) Store your high (SPAN) output temperature by moving the OMEGA switch to the HI position and

turn the 3 PUSH-BUTTON knob until the desired temperature is on the display. Press and hold the
PUSH-BUTTON knob until STORED appears to store the value. Release the PUSH-BUTTON knob.

2) Store your low (ZERO) output temperature by moving the OMEGA switch to the LO position.
and turn the
the PUSH-BUTTON knob until STORED appears to store the value. Release the PUSH-BUTTON knob.

3) Instantly output your SPAN and ZERO temperature outputs by moving the OMEGA switch
between HI and LO. You may also select any third temperature output (such as mid-range) using
the SET position on the OMEGA switch.

3 PUSH-BUTTON knob until the desired temperature is on the display. Press and hold

Automatic Stepping

To change the Automatic Stepping settings

Double click the 3 PUSH-BUTTON at any time the unit is on and the following display will appear for
30 seconds:
Turn the
Push-Button to toggle between OFF and ON or to change the
STEPS and the STEP TIME settings. These settings are
remembered even with the power off.

EXIT MENU - exits this menu immediately and saves any
changes. Menu will automatically exit after 30 seconds of
inactivity.

3 PUSH-BUTTON to move through the menu. Press the 3

EXIT 15
> STEPS 3
STEP TIME 8
AUTO OFF ON

STEPS - pressing the knob will cycle through 2, 3, 5, 11 and 21 steps then reverse dircetion. The
endpoints of the steps are based on the values stored in the HI and LO OMEGA switch outputs.

2 steps will automatically switch between the values stored in the HI & LO OMEGA switch

(0 & 100%).

3 steps between the HI, Midpoint and LO OMEGA switch (0, 50 & 100%).

5 steps between the HI and LO OMEGA switch in 25% increments (0, 25, 50, 75 & 100%).

11 steps between the HI and LO OMEGA switch in 10% increments (0, 10, 20...80, 90 &100%).

21 steps

STEP TIME - pressing the knob will cycle through 5, 6, 7, 8, 9, 10, 15, 20, 25, 30 and 60 seconds.

To start Automatic Stepping

Start automatic stepping or ramping by placing the OMEGA Switch into the HI or LO position
then press and hold the
th e d isp lay aft er 3 s eco nds - cont inu e t o p res s the P USH -BU TTO N k nob) un til th e w ord
STEPPING appears on the display. The word STEPPING will appear on the display anytime the
selected automatic function is running. Stop the stepping by again pressing and holding the
PUSH-BUTTON knob for 3 seconds.

between the HI and LO OMEGA switch in 5% increments (0, 5, 10... 90, 95 & 100%).

3 PUSH-BUTTON knob for 6 seconds (the word STORE will appear on

3

Page 5

Ranges & Accuracies

T/C

Type

Degrees C

Range

J -200.0 to -180.0 ±0.3° -346.0 to -292.0 ±0.5 +Iron White

-180.0 to -50.0 ±0.2° -292.0 to -58.0 ±0.4 -Connstantan Red

-50.0 to 500.0 ±0.1° -58.0 to 932.0 ±0.2 Jacket Black

500.0 to 1200,0 ±0.2° 932.0 to 2192.0 ±0.4°

K -230.0 to -100.0 ±0.6° -382.0 to -148.0 ±1.1° + Chromel© Yellow

-100.0 to 1050.0 ±0.2° -148.0 to 1922.0 ±0.4° -Alumel© Red

1050.0 to 1371.1 ±0.3° 1922.0 to 2500.0 ±0.5° Jacket Yellow

T -260.0 to -200.0 ±1.0° -436.0 to -328.0 ±1.8° +Copper Blue

-200.0 to -50.0 ±0.5° -328.0 to -58.0 ±0.9° -Constantan Red

-50.0 to 0.0 ±0.2° -58.0 to 32.0 ±0.4° Jacket Blue

0.0 to 400.0 ±0.1° 32.0 to 752.0 ±0.2°

E -240.0 to -200.0 ±0.4° -400.0 to -328.0 ±0.7° +Chromel Purple

-200.0 to -100.0 ±0.2° -328.0 to -148.0 ±0.4° -Constantan Red

-100.0 to 850.0 ±0.1° -148.0 to 1562.0 ±0.2° Jacket Purple

850.0 to 1000.0 ±0.2° 1562.0 to 1832.0 ±0.4°

Accuracy Degrees F

Range

Accuracy T/C

Material

ISA/ANSI

Color

Page 6

CL541-PLUS Specifications

(Unless otherwise indicated all specifications are rated from a nominal 23 °C,

70% RH for 1 year from calibration)

General

Accuracy ±(0.008% of Reading + 0.006 mV)

Cold Junction Compensation ± 0.1°F (±0.06°C)

Operating Temperature Range -25 to 60°C (-10 to 140°F)

Relative Humidity Range 10% ≤RH ≤90% (0 to 35°C), Non-condensing

10% ≤RH ≤70% (35 to 60°C), Non-condensing

Size L=5.63 x W=3.00 x H=1.60 inches

Weight 12.1 ounces (including boot & batteries)

Batteries Four “AA” Alkaline 1.5V (LR6)

Battery Life 50 Hours

Optional NiMh

Low Battery Low battery indication with nominal 1 hour of operation

Protection against misconnection Over-voltage protection to 60 Vdc (rated for 30 seconds)

Display High contrast graphic liquid crystal display. LED backlighting

Read

Input Impedance

Open Thermocouple

Threshold
Pulse

Normal Mode Rejection 50/60 Hz, 50 dB

Common Mode Rejection 50/60 Hz, 120 dB

Rechargeable battery kit

120 VAC for North America Only; charger, four
batteries, AC & DC cords [Part # 020-0103]

left

for use in low lit areas.

>10 Megohms

10,000 Ohms nominal
<10 microamp pulse for 300 milliseconds

NiMh

Source

Output Impedance <0.3 Ohms

Source Current >20 mA (drives 80 mV into 10 Ohms)

Noise ≤4 microvolts p-p for frequencies of 10 Hz or below

Additional Information

This product is calibrated on equipment traceable to NIST and includes a Certificate of Calibration.

Test Data is available for an additional charge.

Page 7

Notes:

Page 8

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) year 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.

RETURN REQUESTS/INQUIRIES

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

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 theproduct, 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 2010 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.

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Shop online at omega.com

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