Oldham OLCT 20 User Manual

1

User manual

OLCT 20

Part Number: NPO20GB
Revision: E.0

The Fixed Gas Detection Experts

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Copyright April 2018 by Oldham S.A.S

All rights reserved. No reproduction of all or part of this document, in any for mis
permitted without the written consent of Oldham S.A.S.

All information provided in this document is accurate to the best of our
knowledge.

As a result of continuous research and development, the specifications of this
product may be changed without prior notice.

Oldham S.A.S
Rue Orfila
Z.I. Est – CS 20417
F – 62027 ARRAS Cedex
Tel: [phone]
Fax: [phone]

Table of Contents

iii

Table of Contents

| Overview.............................................................. 1

Limitation of Liability .........................................................................................1

Ownership clauses ...........................................................................................1

Warnings ...........................................................................................................1

Warranty ...........................................................................................................2

Important Information ........................................................................................2

Destruction of equipment ..................................................................................2

Symbols used ...................................................................................................3

| Description .......................................................... 5

Overview ...........................................................................................................5

Main characteristics of the various versions .....................................................5

Mechanical installation of the various versions ................................................6

| Wiring Arrangements ......................................... 7

3-wire version (OLC 20d, OLCT 20d) ...............................................................7

2-wire version (OLCT 20d) ...............................................................................7

2-wire Intrinsic Safety version (OLCT 20i) ........................................................8

| Installation ........................................................... 9

Regulations and operating conditions ..............................................................9

Equipment required ..........................................................................................9

Positioning the detector ....................................................................................9

Mounting the detector .................................................................................... 10

| Maintenance ...................................................... 11

Maintenance frequency ................................................................................. 11

Detector OLC 20 ............................................................................................ 12

Transmitters OLCT 20 ................................................................................... 12

Replacing a sensor on OLCT 20 ................................................................... 14

| Spare Parts ........................................................ 15

Flameproof approved replacement sensors .................................................. 15

Intrinsically-safe approved replacement sensors .......................................... 16

| Accessories ...................................................... 17

| Technical Specifications .................................. 19

Common ........................................................................................................ 19

OLC 20d ........................................................................................................ 19

OLCT 20d ...................................................................................................... 19

OLCT 20i ....................................................................................................... 19

Sensors .......................................................................................................... 20

Cross gas factors for combustible gases ....................................................... 21

Table of Contents

iv

| EU Declaration of Conformity .......................... 25

| Special instructions for use in explosive

atmospheres and fonctional safety.......................................... 27

General comments ........................................................................................ 27

Warnings ........................................................................................................ 27

Requirements for use in dust explosive atmospheres ................................... 27

Cable entries .................................................................................................. 27

Threaded joints .............................................................................................. 28

Limitations of use ........................................................................................... 28

Transfer curve for OLCT20 gas detectors ..................................................... 29

Marking .......................................................................................................... 29

1 – Overwiew 1

| Overview

Thank you for choosing this OLDHAM instrument.
All necessary actions have been taken to ensure your complete satisfaction

with this equipment.
It is important that you read this entire manual carefully and thoroughly.

Limitation of Liability

■ OLDHAM shall not be held responsible for any damage to the equipment or for any

physical injury or death resulting in whole or in part from the inappropriate use or
installation of the equipment, non-compliance with any and all instructions, warnings,
standards and/or regulations in force.

■ No business, person or legal entity may assume responsibility on behalf of OLDHAM,

even though they may be involved in the sale of OLDHAM products.

■ OLDHAM shall not be responsible for any direct or indirect damage, or any direct or

indirect consequence, resulting from the sale and use of any of its products UNLESS
SUCH PRODUCTS HAVE BEEN SELECTED BY OLDHAM ACCORDING TO THE
APPLICATION.

Ownership clauses

■ The drawings, specifications, and information herein contain confidential information

that is the property of OLDHAM.

■ This information shall not, either in whole or in part, by physical, electronic, or any

other means whatsoever, be reproduced, copied, divulged, translated, or used as the
basis for the manufacture or sale of OLDHAM equipment, or for any other reason

without the prior written consent of OLDHAM.

Warnings

■ This is not a contractual document. OLDHAM reserves the right to alter the technical

features of its equipment at any time and for any reason without prior notice.

■ READ THESE INSTRUCTIONS CAREFULLY BEFORE USING FOR THE FIRST

TIME: these instructions should be read by all persons who have or will have
responsibility for the use, maintenance, or repair of the instrument.

■ This instrument shall only be deemed to be in conformance with the published

performance if used, maintained, and repaired in accordance with the instructions of
OLDHAM, by OLDHAM personnel, or by personnel authorized by OLDHAM.

1 – Overwiew 2

Warranty

Under normal conditions of use and on return to the factory, parts and workmanship are
guaranteed for 2 years, excluding consumables such as sensors, filters, etc.

Important Information

The modification of the material and the use of parts of an unspecified origin
shall entail the cancellation of any form of warranty.

The use of the unit has been projected for the applications specified in the
technical characteristics. Exceeding the indicated values cannot in any case
be authorized.

Catalytic sensors are susceptible to poisoning by traces of several
substances. This leads to an inhibition which can be permanent or temporary
depending on the contaminant, the concentration of the contaminant, the
duration of exposure to the contaminant.

Poisoning may result from exposure to substances as:

• silicones (e.g. waterproofing, adhesives, release agents, special oils

and greases, certain medical products, commercial cleaning agents)

• tetraethyl lead (e.g. leaded petrol, particularly aviation petrol ‘Avgas’)

• sulfur compounds (sulfur dioxide, hydrogen sulfide)

• halogenated compounds (R134a, HFO, etc.)

• organo-phosphorus compounds (e.g. herbicides, insectic ides, and

phosphate esters in fireproof hydraulic fluids)

Oldham recommends regular testing of fixed gas detection installations (read

0).

Destruction of equipment

European Union only. This symbol indicates that, in conformity with

directive DEEE (2002/96/CE) and in accordance with local regulations,
this product must not be discarded with household waste.

It must be disposed of in a collection area that is designated for this
purpose, for example at a site that is officially designated for recycling of
electrical and electronic equipment (EEE) or a point of exchange for
authorized products in the event of the acquisition of a new product of the
same type.

The OLCT80 transmitter contains a lithium ion battery intended to supply
power to certain parts of the electronic circuit. The battery will be removed
prior to the destruction of the transmitter and deposited in a collection
center for used batteries.

1 – Overwiew 3

Symbols used

Icon

Signification

This symbol indicates:
useful additional information.

This symbol indicates:
This equipment must be connected to ground.

This symbol denotes:
Protective earth terminal. A cable of the adequate diameter

must be connected to ground and to the terminal having this
symbol

This symbol denotes:

Attention! In the present mode of use, failure to adhere to
the instructions preceded by this symbol can result in a
risk of electric shock and/or death.

This symbol indicates:
You must refer to the instructions.

1 – Overwiew 4

2 – Description 5

| Description

Overview

OLC 20 gas detectors are catalytic type detectors intended for the detection of
combustible gases. They are flameproof certified (OLC 20d).

OLCT 20 gas detectors are 4-20 mA transmitters and are intended for the
measurement of combustible and toxic gases and oxygen. They are either
flameproof certified (OLCT 20d) or intrinsically safe certified (OLCT 20i).

OLC 20s and OLCT 20s are available in ¾ NPT or M25 screw fittings and are
designed to be attached on a junction box or any compatible generic
transmitters.

Main characteristics of the various versions

OLC 20

OLCT 20

LEL

LEL

TOX/O2

Flameproof design

Intrinsic safety design

3-wire cable / Wheatstone bridge

3-wire cable / 4-20 mA output

2-wire cable / 4-20 mA output

Catalytic sensor

Electrochemical sensor

Replacement catalytic sensor

Replacement pre-calibrated
sensor

2 – Description 6

Mechanical installation of the various versions

Please ensure you read the paragraph: Special Specifications for use in
Potentially Explosive Atmospheres in Accordance with European Directive
ATEX 2014/34/EU.

See Appendix 1 for general installation instructions.

Figure 1 : Dimensions

A Dimensions OLC/OLCT 20

Cable length 0.2 m

5 – Maintenance 7

| Wiring Arrangements

Please ensure you read the paragraph: Special Specifications for use in
Explosive Atmospheres in Accordance with European Directive ATEX
2014/34/EU.

3-wire version (OLC 20d, OLCT 20d)

Figure 2

A

B

C D E

OLDHAM controller

OLC or OLCT 20

Grounding

Power supply

Signal (I)

2-wire version (OLCT 20d)

Figure 3

A

B C D

E

OLDHAM controller

OLCT 20

Grounding

Power supply

Signal (I)