Omega Products CL342 Installation Manual

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CL342

Process Current Calibrato

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976 Bergar
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For immediate technical or application assistance:

Usa and Canada:

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Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA
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Servicing Europe:

Benelux:

Czech Republic:

France:

Germany/Austria:

United Kingdom:

ISO 9002 Certified

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly
pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every
appropriate device upon certification.

The information contained in this document is believed to be corrected but OMEGA Engineering Inc. accepts no liability for any errors it

WARNING: These products are not designed for use in, and should not be used for, patient connected applications.

Postbus 8034, 1180 LA Amstelveen, The Netherlands
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Toll Free in Benelux: 0800 0993344
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ul. Rude armady 1868, 733 01 Karvina-Hranice, Czech Republic
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Toll free: 0800-1-66342
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9, rue Denis Papin, 78190 Trappes
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Toll Free in France: 0800-4-06342
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contains, and reserves the right to alter specifications without notice.

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2

INTRODUCTORY NOTE

This publication contains operating instructions, as well as a description of the principles of operation, of
CL342 portable current calibrator. This information covers all models of the instrument, including the basic
equipment and its options and accessories. This manual is a complete “USER GUIDE”, providing step-by­step instructions to operate the instrument in each of its designed functions.

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.
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 Engineering Inc.

CL342 units use sophisticated analogic and digital technologies. Any maintenance operation must be carried
out by qualified personnel

ONLY. We recommend to contact our technicians for any support requirements.

The instrument is supplied with Ni-Cd rechargeable batteries. An external 115V
is supplied as standard.
.
CL342 is fully tested in conformity with the directive n°89/336/CEE Electromagnetic Compatibility. 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.

±

10% 50/60Hz line charger

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INDEX

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

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

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

2.1 Flexibility .......................................................................................................................................................... 7

2.2 Self calibration.................................................................................................................................................. 7

2.3 Keyboard.......................................................................................................................................................... 7

2.4 Display ............................................................................................................................................................. 7

2.5 Generator mode (Passive external circuit - no power supply on the external loop) .........................................7

2.6 Simulator mode (Active external circuit - power supply on the external loop) .................................................. 7

2.7 Measuring mode - normal ................................................................................................................................ 7

2.8 Measuring mode - power (Passive external circuit)......................................................................................... 7

2.9 Power supply mode......................................................................................................................................... 7

2.10 IN-OUT technical unit mode (%) ......................................................................................................................8

2.11 Scale factor ...................................................................................................................................................... 8

2.12 Square root ......................................................................................................................................................8

2.13 Average mode.................................................................................................................................................. 8

2.14 Hold function ....................................................................................................................................................8

2.15 Digital interface ................................................................................................................................................8

2.16 Case................................................................................................................................................................. 8

3 PHYSICAL DESCRIPTION.................................................................................................................. 9

4 FUNCTIONAL DESCRIPTION........................................................................................................... 10

4.1 Power supply.................................................................................................................................................. 10

4.2 Operative keyboard........................................................................................................................................ 10

4.3 Input circuit..................................................................................................................................................... 11

4.4 Microprocessor............................................................................................................................................... 11

4.5 Firmware ........................................................................................................................................................ 11

4.6 Digital display................................................................................................................................................. 12

4.7 Digital to analog converter ............................................................................................................................. 12

4.8 Serial digital interface..................................................................................................................................... 12

4.9 Battery charger. Operation from line source. ................................................................................................. 12

5 UNPACKING...................................................................................................................................... 13

6 PRE-OPERATIONAL CHECK ........................................................................................................... 14

7 ELECTRICAL CONNECTIONS ......................................................................................................... 15

7.1 Wiring practice ...............................................................................................................................................15

8 OPERATIONS & APPLICATIONS .................................................................................................... 16

8.1 Rechargeable batteries ..................................................................................................................................16

8.2 Battery charger. Power supplied from power line ac...................................................................................... 16

8.3 Power on........................................................................................................................................................ 16

8.4 Battery voltage indication. .............................................................................................................................. 17

8.5 Operating mode set-up .................................................................................................................................. 17

8.5.1 IN / OUT function selection........................................................................................................................ 17

8.5.2 Parameter selection ..................................................................................................................................17

8.5.3 Average readings ...................................................................................................................................... 18

8.5.4 Hold function .............................................................................................................................................18

8.5.5 IN / OUT data memories............................................................................................................................ 18

8.5.6 STEP increment ........................................................................................................................................ 19

8.5.7 "Scale factor" mode................................................................................................................................... 19

8.5.8 mA - % selection .......................................................................................................................................19

8.6 Faulty operating conditions ............................................................................................................................19

8.7 Digital interface .............................................................................................................................................. 20

8.7.1 Digital interface program mode .................................................................................................................20

8.7.2 Digital output wiring practice...................................................................................................................... 21

8.7.3 TTL to RS 232 serial adapter ....................................................................................................................21

8.7.4 Communication protocol from CL342 to a computer ................................................................................ 21

8.7.5 Computer request for CL342 settings........................................................................................................ 22

8.7.6 Communication programs ......................................................................................................................... 23

9 MAINTENANCE ................................................................................................................................. 25

9.1 Safety recommendations ............................................................................................................................... 25

9.2 Storage .......................................................................................................................................................... 25

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1 GENERAL PERFORMANCE

The portable indicator - simulator CL342 is an instrument designed to perform, in a modern and practical way, all the
most popular process current check-outs and calibration, both in laboratory and field work. The current signal levels are
those normally used on instruments, components and systems for industrial process control.
Accurate, compact, rugged, easy to use the CL342 represents the ideal solution for measurement and simulation inside
both passive and active external circuits with five different modes of operation:

- Generator mode

- Simulator mode

- Normal measuring mode

- Loop powered measuring mode

- 24V dc power supply

The microprocessor technology provides high accuracy on extended ranges and carries out mathematical computation
(average, scale factor, square root) to simplify operator use.
The selection of operating mode is made on a polycarbonate membrane keyboard which assures up to one million
operations per key.
The measured or the simulated value is indicated on a high quality LCD dot matrix display which provides good contrast
even in poor light conditions.
A menu-driven set-up allows the generation of a single value, and the storage of three values with manual recall .
A manual repeat measurement is also possible (<STEP> key).
The case, made of shock-resistant and self-extinguishing ABS, is ergonomically designed for easy and practical
operations.
The instrument is powered by four Ni-Cd rechargeable batteries AA (1.25V) with an external battery charger supplied as
a standard accessory.

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1.1 Specifications

• IN / OUT parameters

mA and %

• Ranges:

from 0.00 to 22.00 mA
from 4.00 to 20.00 mA

• Resolution:

0.01 mA or 0.1%

• Limits of error:

±(0.05% of the reading +10µA)
(The limits of error are defined at the ambient temperature of 23°C ±2°C for 30 days without the use of the
autocalibration program)

• mA to % conversion :

linear or square

• Common mode rejection:

>130 dB at 50/60 Hz

• Normal mode rejection:

>60 dB at 50/60 Hz

• Temperature stability:

span: ±0.0125% of the reading/°C zero: ±2 µA /°C

• Internal shunt resistance:

< 50Ω

• Output impedance:

Max 1 kΩ (20 mA with internal feeder 24V dc)

• Power supply for external loop:

24V dc with maximum current of 22 mA

• Display:

high contrast dot matrix alphanumeric LCD display (7x5 dots per character - 16 characters)

• Display contrast:

4 step keyboard setting

• Scale factor:

Zero and span programmable within -10000 and +10000

• Square root:

in combination with scale factor (display limits 0 and+2500)

• Calibration:

automatic procedure

• Input protection:

up to 150V with special fuse + electronic protection

• Power supply:

n. 4 AA alkaline batteries or Ni-Cd rechargeable batteries 1.25V 0.7 A/hour

• Digital interface:

TTL logic levels
An adaptor from TTL to RS232 is available on request

• Battery life:

Ni-Cd 8 hours, Alkaline 16 hours continuous operation

• Battery level indication:

low battery symbol

• Battery charger module:

supplied as a standard accessory

• Recharge time:

8 hours to 90% with instrument switched -OFF-

• Batteries voltage:

5.2 V (nominal)

• Program release identification:

release code on the display

• Operating environment temperature range:

from -5°C to +50°C

• Storage temperature range:

from -20°C to 60°C

• Case:

ABS

• Dimensions and Weights:

210 x 96 x 40 mm
net 0.9 Kg gross with packaging 1.2 Kg

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2 GENERAL FEATURES

2.1 Flexibility

Advanced flexibility of performance has been achieved using microprocessor technology.
The indicator-simulator CL342 is a complete system for check outs, measurements and calibrations built into a single
compact portable instrument.
The simulated or measured values can be directly indicated in electrical units (mA) or technical units (%).

2.2 Self calibration

The hardware-firmware design allows for an automatic calibration of the instrument.
A precise source of 20mA dc is the only required standard reference.
The calibration procedure is protected by a security code.

2.3 Keyboard

A tactile polycarbonate membrane keyboard, with a working life of one million operations per key, seals the internal
electronics from the surrounding environment.
It allows the selection of the operative mode and the setting of simulation value with fast and slow upgrading.
Contact closure of membrane keys is acknowledged, as a coded signal, directly by the microprocessor

2.4 Display

The high quality alphanumeric LCD display (7x5 dot matrix per character - 16 characters) allows easy readings even in
poor light conditions.
The operative mode (measurement or simulation), the technical unit and the signal value are simultaneously indicated.

2.5 Generator mode (Passive external circuit - no power supply on the external
loop)

The instrument generates a current signal (ranging from 0.00 mA to 22.00 mA dc) into a passive circuit to calibrate
recorders, controllers, indicators, actuators, etc.

2.6 Simulator mode (Active external circuit - power supply on the external
loop)

Simulates the output of a 2-wire transmitter (0.00 to 22.00 mA dc) in a loop with external power.

2.7 Measuring mode - normal

Reads dc current directly in milliamperes or in technical units (%)

2.8 Measuring mode - power (Passive external circuit)

The instrument provides 24V dc power for operating a 2-wire transmitter and, simultaneously, reads the loop current in
percent (-25.0 to +100.0%) or milliamperes (0.00 to 20.00 mA).

2.9 Power supply mode

The instrument can be used as a loop power source (24Vdc with a maximum current of 22 mA).

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2.10 IN-OUT technical unit mode (%)

The instrument converts the voltage signal into %, or vice-versa, with the following linear relation:

0 4 12 20

-25.00% 0.00% +50.00% +100.00%

2.11 Scale factor

Easy menu-driven set-up to read or simulate electrical signal value in terms of technical units (i.e. bar, % CO, RH, etc.).

2.12 Square root

Can be programmed during the set up procedure (linear ranges only) e.g. to obtain direct readings of flow from a dP
transmitter signal.
The display limits are 0 to +2500.

2.13 Average mode

For the measurements of unstable input signals by a progressive averaging of a programmable number of conversions
(approximately 10 seconds)

2.14 Hold function

To freeze on the display the last measured value.

2.15 Digital interface

A digital interface, with TTL logic levels, is available as standard for communications with external units.
A 4 wire cable, with a male mini connector, and an auxiliary module for TTL to RS232 conversion is available as an
option.

2.16 Case

The case, made of shock-resistant and self-extinguishing ABS, is ergonomically designed for easy practical operation.
The instrument is supplied in a vinyl protective case with carrying strap for easy transportation.

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3 PHYSICAL DESCRIPTION

The CL342 portable calibrator consists of a rugged and compact case, a mother board with all base functions, a tactile
polycarbonate membrane keyboard, an LCD display and a group of four Ni-Cd rechargeable batteries.
The battery container is located on the back of the case and is accessible by sliding and removing the plastic cover.
The case has been designed and manufactured using modern CAD/CAM techniques giving consideration to the
manufacturing process and ergonomic characteristics for easy operation and transportation.
The two halves of the case are joined together by five metal screws located on the back side.
The vinyl case, with shoulder strap, assures better protection of the instrument against knocks or scratches.

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