Omega Products CL550 Installation Manual

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CL550

Po

rtable Temperature Calibrator

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2

INTRODUCTORY NOTE

ATTENTION : THIS MANUAL MUST BE REFERRED TO INSTRUMENTS WITH SERIAL N. 006880 ONWARDS.

This publication contains operating instructions, as well as a description of the principles of operation, of the
CL550 portable temperature calibrator. The information covers all models of the instrument, including the
basic equipment and its options and accessories.
The instructions reported in this manual, for the above mentioned equipment, are those relevant to:

• Start-up preparation

• Operation description

• Start-up instructions

• Shut-down instructions

• Typical faults and their remedies

OMEGA has used the best care and efforts in preparing this book and believes the information in this
publication are accurate. The OMEGA Products are subjected to continuous improvement, in order to pursue
the technological leadership; these improvements could require changes to the information of this book.

OMEGA reserves the right to change such information without notice.
OMEGA makes no warranty of any kind, expressed or implied, with regard to the documentation contained in

this book. OMEGA shall not be liable in any event - technical and publishing error or omissions - for any
incidental and consequential damages, in connection with, or arising out of the use of this book.

The instrument uses sophisticated analog and digital technologies. Repair and service require highly
qualified personnel. OMEGA Engineering, inc will supply, on request, all pertinent instructions and
procedures for service and calibration. OMEGA Engineering, inc specialists will be glad to give any
technical support you may require.

No part of this document may be stored in a retrieval system, or transmitted in any form, electronic or
mechanical, without prior written permission of OMEGA.

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TABLE OF CONTENTS

1 GENERAL PERFORMANCE ...............................................................................................................5

1.1 Specifications ................................................................................................................................................... 6

2 GENERAL FEATURES ........................................................................................................................ 7

2.1 Temperature stability........................................................................................................................................ 7

2.2 Application flexibility ........................................................................................................................................7

2.3 Internal digital indicator ....................................................................................................................................7

2.4 External digital indicator ...................................................................................................................................7

2.5 Digital interface.................................................................................................................................................7

3 PHYSICAL DESCRIPTION ..................................................................................................................8

4 FUNCTIONAL DESCRIPTION ............................................................................................................. 9

5 PRE-OPERATIONAL CHECK............................................................................................................ 10

5.1 Unpacking ......................................................................................................................................................10

5.2 Preparation for the start-up ............................................................................................................................10

5.3 Wiring practice................................................................................................................................................10

5.4 Thermocouple wires....................................................................................................................................... 11

6 SAFETY RECOMMENDATIONS ....................................................................................................... 12

7 OPERATION & APPLICATION.......................................................................................................... 13

7.1 Calibration by comparison..............................................................................................................................13

7.1.1 Calibration with the internal Pt100 sensor .................................................................................................13

7.1.2 Calibration with an external standard Pt100 sensor ..................................................................................14

7.2 Power ON....................................................................................................................................................... 15

7.2.1 Display resolution ......................................................................................................................................15

7.2.2 High temperature option ............................................................................................................................ 16

7.2.3 Temperature switch test ............................................................................................................................16

7.3 Set-up procedure - 1st level ...........................................................................................................................17

7.4 Set-up procedure - 2nd level ..........................................................................................................................18

7.5 P.I.D. tuning ...................................................................................................................................................19

8 MAINTENANCE.................................................................................................................................. 20

8.1 Defects and faults...........................................................................................................................................20

8.2 Spare parts..................................................................................................................................................... 20

8.3 Storage...........................................................................................................................................................21

9 COMMUNICATION............................................................................................................................. 22

9.1 Communication Protocol ................................................................................................................................22

9.2 Reading a variable .........................................................................................................................................22

9.3 Setting a variable............................................................................................................................................23

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1 GENERAL PERFORMANCE

A highly accurate and powerful system to test and calibrate temperature sensors built into a single compact instrument.

The temperature parameter represents the most important factor to fulfill quality, operational safety and reliability of
industrial processes.
Thermocouples, resistance thermometers and any other temperature sensor, when installed in an industrial process, are
subjected to mechanical, thermal and chemical stresses which accelerate their aging.
Therefore it is a recommended procedure to inspect, check and calibrate each sensor during the commissioning phase
and at regular and programmed time intervals.

The temperature calibrator OMEGA series CL550 is a transportable unit designed to obtain a controlled temperature
with high stability, high uniformity in a range from ambient temperature within -30°C and +125 °C.

The internal metal block, designed with a self lock feature to avoid dangerous undesired block drop, is interchangeable
and equipped with a six holes insert and with an immersion depth of 125 mm.

The portable temperature calibrator CL550 is a multifunction instrument designed to meet the needs of instrumentation
engineers, both in laboratory and in field work.
Accurate, compact, rugged, easy to use; the ideal solution to test and calibrate:

• thermocouples

• resistance thermometers

• thermostats

• gas filled thermometers

• mercury thermometers

• material thermal test

CL550 has been designed using the most advanced thermal and electronic technologies to provide high stability and
accuracy with easy operations combined with a powerful operating flexibility.

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1.1 Specifications

• Range

from -30 to +125 °C Std
from -20 to +150 °C with 150°C option

• Stability: ± 0.03 °C

• Stabilizing time: typical 6 min.

• Radial uniformity: ±0.1 °C at 100 °C

• Axial uniformity: ±0.2 °C at 80mm

• Heating rate

15 °C/min Std
20 °C/min with 150°C option

• Cooling rate

from 12 °C/min Std
from 15 °C/min with 150°C option

• Switch test function: with 12 Vdc power supply

• Display: Alphanumeric high contrast dot matrix LCD display 2 line of 16 characters backlight device

• Display resolution: 0.1 or 0.01 °C

• Measuring accuracy: ±0.15°C at 100°C

• Real time clock: with internal battery back up

• A/D converter: 15 bit resolution plus polarity

• Display response time: 10 readings a second

• Digital interface: RS232

• Internal cryostat: Peltier Cells

• Internal metal block: standard aluminium with n. 6 holes ø 3.175 / 4.75 / 6.5 / 8 / 9.5 / 19 mm.

• Electronic section: in a separate metal shell

• Internal temperature sensor: Pt100 Class A sensor (control and indication)

• External temperature sensor: An auxiliary input connectors for Pt100 sensor is available on the back panel

• Temperature control: PID with optimized tuning constants

• Heat/cool control: full automatic switch-over

• Protection grid: removable

• Mains line connection: socket for mains line cable equipped with a protection fuse

• Power supply: 110 or 220 Vac (to be specified) 50/60 Hz

• Power: 300 VA

• Chassis: separate shell for thermal and electronic sections with carrying handle

• Size: 370 x 300 x 140mm

• Weights: Net 10 kg Gross 17 kg

• Aluminium case dimensions: 410 x 350 x 250 mm

• Packing dimensions: 450 x 450 x 350 mm

ATTENTION :

THE MINIMUM RELEVANT TEMPERATURE IS RELATED TO AMBIENT TEMPERATURE.

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2 GENERAL FEATURES

2.1 Temperature stability

The internal microcontroller system handles, through the keyboard, the man-machine communications, the internal logic
and grants a stability of the internal thermal equalizing metal block of ±0.05 °C.
The temperature control uses a sophisticated PID algorithm with memory stored optimized tuning constants.
For special tests the operator could, through a security code, load different tuning constants.

2.2 Application flexibility

The operative set-up mode is made simple and easy with a sequence of menu pages that only requires <F> (Function),
<E> (Enter), <s> (Increase) and <t> (Decrease) instructions.

The panel lamp and keys have the following features:

"HEATING" LED indicates power applied to the oven
"COOLING" LED indicates cooling action through the modulated fan
"SWITCH TEST" LED indicates thermostat switch-over
<F> key for function selection
<s> and <t> parameter adjustment
<E> Enter key for new instruction acknowledgement

The instrument will also provide some acoustic signals as it follows:
single "beep" operator instruction acknowledgment when the <E> key is pressed

multiple "beep" (five times) the temperature is stabilized on the set-point value and the instrument is ready for

sensor calibration.

2.3 Internal digital indicator

The internal digital indicator is a dot matrix LCD display with 2 lines of 16 characters equipped with a backlight device for
easy reading also in poor light condition.
The operator could select the required operative function, the set-point value and read the temperature value of the
internal thermal equalizing block.
The temperature is obtained with a class A Pt100 resistance thermometer Pt100. The measurement accuracy is ±

0.15°C at 100°C using the internal Pt100 sensor.
The overall limit of error can be improved using an external high accuracy calibrated resistance thermometer that can be
supplied on request.

2.4 External digital indicator

When an high accuracy is required, the portable temperature calibrator CL550 can be used in combination with a high
accuracy indicator and an external high accuracy calibrated resistance thermometer (ask for the pertinent literature).

2.5 Digital interface

The calibrator is standard equipped with a full bi-directional RS232 digital interface for any communication with a
Personal Computer.
The Portable Temperature Calibrator can be part of an automatic calibration system with a programmable cycle and the
acquisition of all data required to generate a full calibration report.
OMEGA engineers are ready to support you with components, accessories and software that fulfil your application
requirements.

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3 PHYSICAL DESCRIPTION

The CL550 portable temperature calibrator consists of two modules mechanically and electrically interconnected.
The module on the left incorporates the cryostat, the thermal equalizing metal block, the Peltier cells and a modulated air
blower.
The module on the right present the alphanumeric dot matrix LCD display with a backlight device, a microcontroller
mother board with all base functions, an operator keyboard, a power package.

The portable temperature calibrator is supplied in an aluminum case with cover and carrying handle to assure easy
transportation and better protection of the instrument against mechanical knocks or scratches.

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