ISC/Oldham OLC20 Series, OLCT20 Series, OLCT40D Series, OLC20, OLCT40 Series Installation And Use Manual

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OLC20

Installation and use

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OLCT20 – OLCT 40

Ref.: CD00004 Code: 06_MT_OLC/OLCT 20-40_GB_24_11_06

GAS DETECTION

We are delighted that you have chosen an ISC/OLDHAM instrument and would like to thank you for your choice.

We have taken all the necessary measures to ensure that your instrument provides total satisfaction. Now it is important to read this document carefully.

EEXXTTEENNTT OOFF RREESSPPOONNSSIIBBIILLIITTYY

* ISC/OLDHAM declines its responsibility towards any person for material damage, physical injury or death

resulting wholly or partly from inappropriate use, installation or storage of its equipment resulting from failure to observe instructions and warnings and/or standards and regulations in force.

* ISC/OLDHAM neither supports nor authorises any company, physical or moral person to assume responsibility on

behalf of ISC/OLDHAM , even if it is involved in the sale of ISC/OLDHAM products.

* ISC/OLDHAM cannot be held responsible for direct or indirect damage or be required to pay direct or indirect

compensation resulting from the sa le or use of any of its products IF THESE PRODUCTS HAVE NOT BEEN

DEFINED AND CHOSEN BY ISC/OLDHAM FOR THEIR SPECIFIC USE.

CCLLAAUUSSEESS CCOONNCCEERRNNIINNGG PPRROOPPEERRTTYY

* Drawings, plans, specifications and information included in this document contain confidential information that is

the property of ISC/OLDHAM

* None of this information may be reproduced, copied, divulged or translated, by physical, electronic or any other

means, nor used as the basis for the manufacture or sale of ISC/OLDHAM equipment or for any other reasons

without prior consent from ISC/OLDHAM

WWAARRNNIINNGGSS

* This document is not contractually binding. In the interests of its customers, ISC/OLDHAM reserves to modify the

technical specifications of its equipment without notice, in order to improve its performance.

* READ THIS MANUAL CAREFULLY BEFORE FIRST USE OF THE EQUIPMENT: this manual must be

read by any person who is or will be responsible for using, maintaining or repairing this equipment.

* This equipment will only provide the announced performance levels if it is used, maintained and repaired

according to ISC/OLDHAM directives, by ISC/OLDHAM personnel or by personnel approved by ISC/OLDHAM

GGUUAARRAANNTTEEEE

2 years guarantee in normal conditions of use on parts and technical labour, return in our workshops, excluding consumables (sensors, filters, etc.)

FIG 1

A Dimensions OLC/OLCT 20 Cable length 0.4 m

FIG 2

A Dimensions OLC/OLCT 20D

2 or 3 conductor remote cable Length 5, 10 or 15 m

FIG 3

FIG 4

OLCT40

A B C D

Casing EEx e

Cable gland PG9 for ∅ 6mm to ∅ 12 mm cable

Dimensions and fixing OLCT 40

Junction box approved EEx e

Detector OLCT 20

FIG 5

B C D

FIG 6

A B C D

Casing EEx e

Cable gland PG9 for ∅ 6mm to ∅ 11 mm cable

Shielded cable Length 10 m

Remote detector

3 :

E D

Dangerous area

Safe area

C B

D E

A B C D E F

2 :

FIG 7

ISC/OLDHAM control unit

+ +

- -

Detector or transmitter

Earth shielding

+ power supply - power supply Signal (I)

A B C D E

ISC/OLDHAM

Transmitter Earth shielding + power supply - power supply

control unit

A B C

FIG 8

FIG 9

Control unit Transmitter ZENER Barrier

C O N T E N T S

I. Description of the OLC / OLCT20 family .........................................................................11

1. General..........................................................................................................................11

2. Main characteristics of the various versions .................................................................12

II. Description of the OLCT40 / OLCT40D family .............................................................13

1. General..........................................................................................................................13

2. Main characteristics of the various versions .................................................................13

III. Mechanical installation of the various versions.............................................................14

1. OLC20 and OLCT20.....................................................................................................14

2. OLC20D and OLCT20D (remote version) ...................................................................14

3. OLCT 40 .......................................................................................................................14

4. OLCT 40D (remote version).........................................................................................14

IV. Wiring of the various versions.........................................................................................14

1. 3-Wire versions .............................................................................................................14

2 2-wire versions ..............................................................................................................14

3. 2-wire Intrinsic Safety versions.....................................................................................14

V Maintenance.........................................................................................................................15

1. Detectors OLC20 and OLC20D....................................................................................15

1.1. CALIBRATION....................................................................................................15

1.2. Replacing a cell unit on OLC 20 or OLC 20 D.....................................................16

2. Transmitters OLCT20/20D and OLCT40/40D.............................................................16

2.1 CALIBRATION......................................................................................................16

2.2 . CALIBRATION SPECIFICATIONS...................................................................18

2.3 Replacing a cell unit on OLCT 20/20D or OLCT 40/40 D....................................18

VI. List of spare parts............................................................................................................19

1 Explosion-proof cell units OLCT 20/20 D and OLCT40/40D .......................................19

2 Intrinsic safety cell units OLCT 20/20 D and OLCT40/40D.........................................20

3. Explosion-proof cell units OLC20 and OLC20D (remote cell) .....................................21

VII. List of accessories for detectors OLC20/20D and transmitters OLCT20/20D,

OLCT40/40D..................................................................................................................22

VIII. TECHNICAL CHARACTERISTICS OF OLC20 and OLC20D .............................23

1. Electric power supply....................................................................................................23

2. MISCELLANEOUS......................................................................................................23

IX. Technical characteristics of OLCT20/20D and OLCT40/40D..................................24

1. Electric power supply....................................................................................................24

2. Output signal.................................................................................................................24

3. MISCELLANEOUS......................................................................................................25

X. Special Specifications for use in Potentially Explosive Atmospheres in

accordance with European Directive ATEX 94/9/EC................................................26

1. Specifications for mechanical and electrical installation in Classified Areas. ..............26

1.1. Explosion-proof detectors (d): OLC/OLCT 20 d and enlarged safety (e)

and explosion-proof (d) : OLC/OLCT40 d ..........................................................26

1.2. Explosion-proof detector (d) version HT High Temperature ...............................26

1.3. Intrinsic safety detectors (i) OLCT20 i and OLCT40 i........................................27

2. Metrological specifications for explosive gas and oxygen measurement detectors ......27

2.1. Technical Specifications and Special Instructions for explosive gas detectors....28

2.2. Technical Specifications and Special Instructions for Oxygen detectors.............31

3. MARKINGS..................................................................................................................32

3.1. Explosion-proof safety version : OLC20d and OLCT20 d ...................................32

3.2. Explosion-proof safety version: OLC20d High temperature HT .........................32

3.3. Intrinsic safety version: OLCT20 i......................................................................32

3.4. Explosion-proof and enlarged safety version : OLC 40 d/OLCT40d...................33

3.5. Intrinsic safety version: OLCT40 i.......................................................................33

XI. APPENDICES...................................................................................................................36

II.. DDeessccrriippttiioonn ooff tthhee OOLLCC // OOLLCCTT2200 ffaammiillyy

1. General

The gas detectors in the OLC20 series are catalytic cell type detectors intended for the detection of combustible gases. They are only available in explosion proof protection mode, the approved type is OLC20D. A special OLC20 HT (High Temperature) version provides detection in ambient temperatures up to 200°C.

The OLCT20 type gas detectors are 4-20 mA transmitters (3-wire or 2-wire T signifies Transmitter) and are intended for the measurement of combustible and toxic gases and oxygen. They are available in explosion proof protection mode (The approved type is OLCT20D) or in intrinsic safety protection mode (the approved type is OLCT 20i)

Series OLC20 and OLCT20 consist of two types of detectors or transmitters:

Ø version OLC20 or OLCT20

Ø version OLC20D or OLCT20D (D signifies remote version)

OLC20

− designed to be screwed onto a housing using the equipment's ¾ NPT or M25

screw fitting (standard),

− connected to the measurement data logger inside the ho using equipped with a

cable with a standard length of 40 cm.

− mounted in place by means of a bracket supplied as an accessory,

− supplied with 5, 10 or 15 metre length of shielded cable and which can be

connected to the measurement data logger either directly or via a branch box if the cable length is greater.

OLC20D

2. Main characteristics of the various versions

Explosion-proof safety housing

Intrinsic safety housing

Outlet via packing gland1

3-wire cable / Wheatstone bridge

3-wire cable / 4-20 mA output

2-wire cable / 4-20 mA output

OLC20 OLC20D

EXPLO EXPLO EXPLO TOX/O2 EXPLO TOX/O2

OLCT20 OLCT20D

X X X X X X

X X

X X X X X X

X X

Catalytic cell

Electrochemical cell

Interchangeable unit

Interchangeable and precalibrated unit

Wall mounting bracket

X X X X

X X

X X X X

X X X

On request, the OLCT20 transmitter type in intrinsic safety version can be delivered with a sealed cable.

IIII.. DDeessccrriippttiioonn ooff tthhee OOLLCCTT4400 // OOLLCCTT4400DD ffaammiillyy

1. General

The gas detectors in the OLCT 40 series are 4-20 mA TRANSMITTERS (3-wire or 2-wire) which are intended for the measurement of combustible and toxic gases and oxygen.

The OLCT 40 series comprises two types of TRANSMITTERS:

Ø Version OLCT 40: housing/cell unit assembly

In this case, the transmitter is connected directly to the measurement data logger.

See Figure 04 at the beginning of this manual.

Ø Version OLC 40 D (D signifies remote cell unit)

In this case, the measurement data logger is connected to the main housing. See Figure 06 at the beginning of this ma nual.

2. Main characteristics of the various versions

Explosion-proof safety cell unit Intrinsic safety cell unit Outlet via packing gland 3-wire cable / 4-20 mA output 2-wire cable / 4-20 mA output Catalytic cell Electrochemical cell Interchangeable and precalibrated unit Wall mounting bracket of the cell unit

OLCT40 OLCT40D

EXPLO TOX/O2 EXPLO TOX/O2

X X X X

X X X X X X X X

X X X X

X X X X X X

X X

IIIIII.. MMeecchhaanniiccaall iinnssttaallllaattiioonn ooff tthhee vvaarriioouuss vveerrssiioonnss

Please ensure you read the paragraph: Special Specifications for use in Potentially Explosive Atmospheres in Accordance with European Directive ATEX 94/9/EC

See Appendix 1 for general installation instructions.

1. OLC20 and OLCT20

- See Figure 01 (at the beginning of this manual). Note: The threaded outlet from the body can be used to attach the OLC20 detector or the

OLCT20 transmitter to its mounting (box, case, etc.).

2. OLC20D and OLCT20D (remote version)

- See Figures 02 and 03 (at the beginning of this manual).

3. OLCT 40

See the beginning of this manual:

- Figure 04 for dimensions,

- Figure 05 for attachment of the main housing.

4. OLCT 40D (remote version)

See the beginning of this manual:

- Figure 06 for dimensions,

- Figure 03 for attachment of the remote cell.

IIVV.. W

Wiirriinngg ooff tthhee vvaarriioouuss vveerrssiioonnss

Please ensure you read the paragraph: Special Specifications for use in Potentially Explosive Atmospheres in Accordance with European Directive ATEX 94/9/EC

1. 3-Wire versions

- - See Figure 07 (at the beginning of this manual)

2 2-wire versions

- - See Figure 08 (at the beginning of this manual)

3. 2-wire Intrinsic Safety versions

- See figure 09 (at the beginning of the manual)

VV MMaaiinntteennaannccee

Caution: The operations and adjustments described in this chapter must be performed by

authorized personnel only as they can affect the appliance's reliability in detection.

IMPORTANT: It is prohibited to open the transmitter when energized.

1. Detectors OLC20 and OLC20D

These types of detectors are equipped with a removable cell unit.

Gas detection instruments are potential life-saving devices. Recognizing this fact, Industrial Scientific Corporation recommends that a functional “bump” test be performed on every fixed gas-monitoring instruments as part of a regular maintenance program. A functional test is defined as a brief exposure of the detector to a concentration of gas(es) in excess of the lowest alarm set-point for each sensor for the purpose of verifying sensor and alarm operation and is not intended to be a measure of the accuracy of the instrument. Industrial scientific further recommends that a full instrument calibration be performed using a certified concentration(s) of calibration gas(es) quarterly, every 3 months.* Calibrations may be necessary more or less frequently based, for example, on application, field conditions, exposure to gas, sensor technology, and environmental conditions. The frequency of calibration is best determined by company policy or local regulatory agencies. If an instrument fails to operate properly during any functional “bump” test, a full instrument calibration should be performed successfully prior to use. These recommendations are based on safe work procedures, industry best practises, and regulatory standards to ensure worker safety. Industrial scientific is not responsible for setting safety practices and policies. * For new installations it may be prudent to carry out bump tests frequently at first (perhaps weekly),

increasing the time intervals (to, perhaps, monthly or more) as confidence grows with experience in the installation concerned, on the basis of the maintenance record.

1.1. CALIBRATION Procedure to be followed once the required site authorisations have bee granted

On the data logger On the DETECTOR

Set the measuring channel to the calibration position (alarm relays inhibited)

Make the zero and sensitivity adjustments.

Return the measuring channel to the "normal" position and make sure that it is working properly, after.

Position the gas input pipe and carry out the calibration in accordance with the procedure defined during the training course provided by ISC/OLDHAM or by a person approved by ISC/OLDHAM .

Important note regarding version OLC 20 High Temperature Detector

§ The OLC20 HT sensor is powered by a DC supply fro m the ISC/OLDHAM measuring

device. This current depends on the sensor operating temperature. The higher the temperature, the lower the supply voltage. The device current rating is factory-set to suit the operating temperature.

§ The sensor is zeroed on the device when the sensor is at its stabilised operating temperature.

If the operating temperature falls or rises as a result of the process, the zero signal will vary accordingly. For example, a 100°C variation causes a sensor zero drift of +- 15% LEL CH4.

§ Sensor sensitivity is factory-set. On site, sensor sensitivity can be calibrated on the device

when the sensor is at its stabilised operating temperature.

1.2. Replacing a cell unit on OLC 20 or OLC 20 D

When?

- - When the cell unit is damaged or cannot be calibrated.

- - On a preventive basis.

How? See the following page

- Switch off the relevant measuring channel.

- Remove the cell unit to be replaced.

- Replace it with a new unit.

- Switch the channel back on and check that it operates correctly.

2. Transmitters OLCT20/20D and OLCT40/40D

These types of transmitters are equipped with a precalibrated cell unit and do not require any adjustment on installation.

However, as they constitute safety equipment, it is recommended that these types of TRANSMITTERS should be calibrated at least twice a year (in normal operating conditions).

2.1 CALIBRATION

These types of transmitters equipped with a precalibrated cell unit are designed to allow quick servicing action on site.

- After removing the cell block from the transmitter, calibration is performed using a

calibrating bench provided for that purpose.

Note: To operate this bench, see the operating procedure supplied with it.

Reinstall the same newly calibrated unit or

Calibrating procedure

Procedure to be followed after obtaining all necessary

authorisations to conduct work on site

On the data logger

Switch off the measuring channel

Switch the measuring channel back on and make sure that it is working properly, after stabilizing the measurement.

On the TRANSMITTER

replacement unit and reinstall the whole assembly.

locking screw

1 : Rotate the unit

through ¼ turn

2 : Extract it

- Disconnect the connector linking the cell unit to the transmitter body.

(1)

Loosen the

Reminder: Transmitters OLCT20(D) and OLCT4O(D) use the same cell unit.

2.2 . CALIBRATION SPECIFICATIONS

CAUTION:

Calibration is to be performed outside classified areas and using suitable equipment that is described during the training course provided by ISC/OLDHAM or by a person approved by ISC/OLDHAM

CELL UNIT OLCT20/40 (D) (explo/tox/O2)

2.3 Replacing a cell unit on OLCT 20/20D or OLCT 40/40 D

When?

- When the cell unit is damaged or cannot be calibrated.

- - On a preventive basis.

How?

- Switch off the relevant measuring channel.

- Remove the cell unit to be replaced.

- Replace it with a new, precalibrated unit.

- Switch the channel back on and check that it operates correctly.

3. Scrapping of olct 20 40

Concerning the conservation, of the protection and the improvement of the quality of the environment, as well as for the protection of the health of the persons and the careful and rational use of natural resources, OLCT 20 40 has to be the object of a selective collection for the electronic equipments and cannot be scrapped with the normal domestic waste. The user thus has the obligation to separate the OLCT 20 40 of the other waste so as to guarantee that it is recycled in a sure way at the environmental level. For more details of the existing sites of collection, contact the local administration or the distributor of this product.

item 1

item 2

- Adjustment of 0 in clean air, using potentiometer (item 1).

- Adjustment of sensitivity (with standard gas), using the

potentiometer (item 2).

VVII.. LLiisstt ooff ssppaarree ppaarrttss

CAUTION: It is mandatory that spare parts must be guaranteed original ISC/OLDHAM parts as,

otherwise, the reliability of the equipment could be adversely affected.

1 Explosion-proof cell units OLCT 20/20 D and OLCT40/40D

EXPLOSION-PROOF CELL UNITS (ADF) REFERENCES

CELL UNIT OLCT20 ADF EXPLO C1000

CELL UNIT OLCT20 ADF EXPLO AP CELL UNIT OLCT20 ADF KATHARO C1000

CELL UNIT OLCT20 ADF NH3 5000ppm

CELL UNIT OLCT20 ADF CO – 100 PPM CO – 300 PPM CO – 1000 PPM

CELL UNIT OLCT20 ADF H2S – 30 PPM H2S – 100 PPM H2S – 1000 PPM

CELL UNIT OLCT20 ADF NO – 100 PPM NO – 300 PPM NO – 1000 PPM

CELL UNIT OLCT20 ADF H2 – 2000 PPM

CELL UNIT OLCT20 ADF NH3 – 100 PPM NH3 – 1000PPM

CELL UNIT OLCT20 ADF O2 0–30%vol

6313685

6313686 6313687

6313688

6313690 6313691 6313692

6313695 6313696 6313697

6313698 6313699 6313700

6313706

6313707 6313708

6313710

2 Intrinsic safety cell units OLCT 20/20 D and OLCT40/40D

INTRINSIC SAFETY CELL

UNITS (SI)

CELL UNIT OLCT20 SI CO – 100 PPM CO – 300 PPM CO – 1000 ppm

CELL UNIT OLCT20 SI H2S – 30 PPM H2S – 100 PPM H2S – 1000 ppm

CELL UNIT OLCT20 SI NO – 100 PPM NO – 300 PPM NO – 1000 ppm

CELL UNIT OLCT20 SI NO2 – 10 PPM NO2 – 30 PPM

CELL UNIT OLCT20 SI SO2 – 10 PPM SO2 – 30 PPM SO2 – 100 ppm

CELL UNIT OLCT20 SI H2 – 2000 PPM

CELL UNIT OLCT20 SI NH3 – 100 PPM NH3 – 1000 PPM

CELL UNIT OLCT20 SI HCL – 30 PPM HCL – 100 PPM

CELL UNIT OLCT20 SI HCN – 10 PPM HCN – 30 PPM

CELL UNIT OLCT20 SI CL2 - 10 PPM

CELL UNIT OLCT20 SI O3 - 1 ppm

CELL UNIT OLCT20 SI COCL2 - 1 ppm

CELL UNIT OLCT20 SI PH3 - 1 ppm

CELL UNIT OLCT20 SI ASH3 - 1 ppm

CELL UNIT OLCT20 SI HF - 10 ppm

CELL UNIT OLCT20 SI ClO2 - 3 ppm

CELL UNIT OLCT20 SI ETO - 30 ppm

CELL UNIT OLCT20 SI SiH4 - 50 ppm

CELL UNIT OLCT20 SI O2 – 30% vol

REFERENCES

6313711 6313712 6313713

6313716 6313717 6313718

6313719 6313720 6313721

6313722 6313723

6313724 6313725 6313726

6313727

6313728 6313729

6313730 6313731

6313732 6313733

6313734

6313735

6313736

6313737

6313738

6313739

6313740

6313746

6313747

6313748

3. Explosion-proof cell units OLC20 and OLC20D (remote cell)

Explosion-proof cell unit C1000 6313757

Explosion-proof cell unit AP (antipoison) 6313758

Katharometric cell unit 6313759

High-temperature explo. cell unit 6314571

VVIIII.. LLiisstt ooff aacccceessssoorriieess ffoorr ddeetteeccttoorrss OOLLCC2200//2200DD

aanndd ttrraannssmmiitttteerrss OOLLCCTT2200//2200DD,, OOLLCCTT4400//4400D

TOOL KIT

GAS INPUT DEVICE

6147869

6331141

GAS CIRCULATION HEAD

For explosive gases, CO, H2S, O2

SPLASH GUARD DEVICE

PROTECTIVE FILTER, PTFE

ACTIVE CARBON FILTER

REMOTE GAS INJECTION HEAD

(for explosive gases only)

6327910

6329004

6335975

6335976

6327911

VVIIIIII.. TTEECCHHNNIICCAALL CCHHAARRAACCTTEERRIISSTTIICCSS OOFF OOLLCC2200

OLC20

OLC20D

aanndd OOLLCC2200DD

1. Electric power supply

Power supply: voltage on detector terminals = 2.8 V max Power consumption: 3-wire version = 400 mA max

Mesureament signal: Wheastone bridge

Line length (shielded cable): 3-wire version = 1 km as 3x 1.5 mm2 (32 ohms in loop mode)

2. MISCELLANEOUS

Protection index : IP66

WEIGHT: 800 g

Dimensions :60 X 120 mm

IIXX.. TTeecchhnniiccaall cchhaarraacctteerriissttiiccss ooff OOLLCCTT2200//2200DD aanndd

OOLLCCTT4400//4400DD

1. Electric power supply

A) Explosion-proof version

Power supply: voltage on detector terminals = 15 V to 30 V

Power consumption: 3-wire version = 100 mA

2-wire version = 25 mA

Load resistance : maximum resistance = 250 ohms

Line length (shielded cable): 3-wire version = 1 km as 3x 1.5 mm2 (32 ohms in loop mode)

2-wire version = 4 km as 3x 1.5 mm2 (32 ohms in loop mode)

B) Intrinsic safety version

Characteristics of ZENER barrier: 28 V - 300 ohms

Supply voltage for barrier: 19 V to 26 V Voltage on detector terminals: 10 V to 26 V Power consumption: 25 mA max Load resistance: 47 ohms Line length (shielded cable): 1 km as 3x 1.5 mm2 (32 ohms in loop mode)

2. Output signal

Source mode current = 4-20 mA

Max. current: 25 mA Fault current: <1 mA

3. MISCELLANEOUS

OLCT20/20D OLCT40/40D

Protection index

Weight

Dimensions

IP66 IP66

800grs 1K200

60X120 mm 70X 130 mm

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EExxpplloossiivvee AAttmmoosspphheerreess iinn aaccccoorrddaannccee wwiitthh EEuurrooppeeaann DDiirreeccttiivvee AATTEEXX 9944//99//EECC..

The OLC/OLCT 20 & 40 detection devices comply with the requirements of European

Directive ATEX 94/9/EC on potentially explosive atmospheres.

As a result of its metrological performance, as tested by the research and testing organisation INERIS, the OLC/OLCT 20 & 40 device s, designed to measure explosive gasses and oxygen, are classified as a safety devices and may therefore contribute to limiting the risk of explosion.

The information contained in the following paragraphs should be adopted and complied with by the person responsible for the site on which the equipment is installed. Please refer to the provisions of European Directive ATEX 1999/92/EC on improving health and safety conditions for workers exposed to potentially explosive atmospheres.

1. Specifications for mechanical and electrical installation in Classified Areas.

Installation will comply with all applicable standards, and particularly with EN 60079-14, EN 60079-17 and EN 50281-1-2.

1.1. Explosion-proof detectors (d): OLC/OLCT 20 d and enlarged safety (e) and explosion-proof (d) : OLC/OLCT40 d

- These detectors are intended for use in surface industries II, Category 2, zones 1 and 2

(Gas) and zones 21 and 22 (Dust) in ambient temperature from -25°C to +70°C.

- Cables will be mechanically protected.

- The transmitter casing will be earthed using the external or internal terminal, which

should be corrosion-protected. Users should clean detectors regularly in order to prevent any external accumulation of dust.

- Mechanically, detectors will be installed such that the detection cell points downwards.

Any variance of over 45° from the vertical will result in measurement er rors.

- Where connections are located in a classified zone, they will be enclosed in approved

envelopes.

1.2. Explosion-proof detector (d) version HT High Temperature

- The OLC20 d HT cell block is intended for use in surface industries II, Category 2,

zones 1 and 2 (Gas) in ambient temperature ranges that vary according to the temperature classes applying to the zone concerned:

- Temperature class T4: Ambient temperatures from –25°C to +110°C

- Temperature class T3: Ambient temperatures from –25°C to +180°C

- Temperature class T2: Ambient temperatures from –25°C to +200°C

- The cable will be mechanically protected.

- The transmitter casing will be earthed using the external terminal, which should be

corrosion-protected.

- Where connections are located in a classified zone, they will be enclosed in approved

envelopes.

1.3. Intrinsic safety detectors (i) OLCT20 i and OLCT40 i

- These detectors are intended for use in surface industries II, Category 1, zones 0, 1 and 2

(Gas) and zones 20, 21 and 22 (Dust). They are also intended for coal mines II, Category M1. The ambient operating temperature range is –25°C to +70°C.

- Users should clean detectors regularly in order to prevent any external accumulation of

dust.

- The person responsible for IS installation (the “System Designer”) must draw up a

system document demonstrating that every aspect of the Power Cable Detector system complies with intrinsic safety. Please refer to EN 50039 for group II when drafting this document.

- They must be powered by an intrinsic safety source: 28V - 300 ohms

- Where connections are located in a classified zone, they will be enclosed in approved

envelopes.

- The safety parameters applying to the OLCT20i and OLCT40i detectors are :

Ui (V) Ii (mA) Pi (mW) Ci (nF) Li (H)

28 94 658 40 15µH

2. Metrological specifications for explosive gas and oxygen measurement detectors

The OLC/OLCT 20 & 40 transmitter sensors intended to measure explosive gasses and oxygen are classified as safety devices and may therefore contribute to limiting the risk of explosion. N.B.: the OLC20 d High Temperature detector does not fall within this category.

Detectors comply with the following European standards:

Explosive gas detectors:

- OLC20 explosive gas detectors comply with European standards EN 50054 and EN

50057 for Methane (calibration gas), Propane and Hydrogen (gasses following response curves) where they are used with ISC/OLDHAM detection devices SV4B, MX32, MX42A, MX48 and MX52.

- OLCT20 and OLCT40 explosive gas detectors comply with European standards EN

50054 and EN 50057 for Methane (calibration gas), Propane and Hydrogen (gasses following response curves), where they are used with ISC/OLDHAM detection devices SV4B, MX32, MX42A, MX48 and MX52, or where they are connected to measurement devices with 4-20 mA inputs in accordance with paragraph 1.5 of Appendix II of the ATEX 94/9/EC Directive and are compatible with their characteristics (cf. transfer curve).

Oxygen detectors:

- OLCT20 and OLCT40 oxygen detectors comply with European Standard EN 50104

where they are used with ISC/OLDHAM detection devices MX32, MX42A, MX48 and MX52, or where they are connected to measurement devices with 4-20 mA inputs in accordance with paragraph 1.5 of Appendix II of the ATEX 94/9/EC Directive and are compatible with their characteristics (cf. transfer curve).

Fault

2.1. Technical Specifications and Special Instructions for explosive gas detectors

2.1.1. Transfer curves for OLCT 50 / OLCT50-A detectors

The following curve shows transmitter output current values as a function of gas concentration. Where the user connects the transmitter to a device other than a device manufactured by ISC/OLDHAM, he must check that the transfer curve is fully compatible with its input characteristics to ensure that the information generated by the transmitter is correctly interpreted. Equally, the device must supply a suitable power supply voltage, allowing for cable voltage losses.

Output Current in mA

23.2 mA

20.0 mA

Fault

4.0 mA 1 mA

0 %

Concentration in % LEL

100 % 120%

Please note: Detectors can generate ambiguous measurements at high gas concentrations, i.e. the current output for a > 20% concentration of gas by volume is the same as for a concentration of < 5% by volume (bell curve). It is therefore essential that the measuring device memorises the fact that the value has exceeded the scale and that resetting is manual rather than automatic, and follows the safety regulations specific to the site.

2.1.2. Metrological details

Type

C1000 filaments - +VQ1

Maximum concentration

100% LEL

Principle

Catalytic

Estimated service life

> 36 months

Storage

Away from air -10°C < T < 35°C 10% < RH < 60%. Maximum 6 months

Continuous temperature range

Humidity range

Pressure range

Linearity variance (methane scale)

Measurement reproducibility

-25°C to +55°C

0% RH to 95% RH

1 bar ± 10%

Between 0% and 70% LEL: ≤ 1% LEL Between 70% and 100% LEL: ≤ 7% LEL

± 2% of the value measured, or ± 1 LEL (or ± 0.05% CH4)

Long-term drift in normal operating conditions

Zero point: Sensitivity: Methane Propane/Butane

< 5% methane LEL per year Typical drift values < 20% of the value measured per year < 10% of the value measured per year

Effect of humidity (10% to 90% RH) at

± 5% of relative sensitivity

40°C Maximum recommended interval

6 months

between calibrations (normal operating conditions)

Calibration concentration 30– 80% LEL Response time

(may vary ± 10% between sensors)

gas and

concentration

injected

Methane

(50% LEL)

Hydrogen

(50% LEL)

Pentane

(52% LEL)

Styrene

(45% LEL)

t25 4 sec 3 sec 8 sec 12 sec t50 8 sec 6 sec 12 sec 40 sec t90 15 sec 10 sec 27 sec 60 sec

Coefficient

Acetone

C3H6O 2.15

13.0%

2.1 1.65 1.2 0.95 Acetylene

C2H2

1.5%

100%

0.9 2.35 1.75 1.35 Ammonia

NH3

15.0

30.2%

0.6 0.9 0.65 0.5 Butane

C4H10

1.5%

8.5%

1.75 1.25 1.0 Unleaded petrol 95

1.1%

∼6.0%

3 à 4

1.8 1.35 1.05 Ethane

C2H6

3.0%

15.5%

1.04 1.5 1.1 0.85 Ethanol

C2H6O 3.3%

19.0%

1.6 1.5 1.1 0.85 Ethylene

C2H4

2.7%

34.0%

0.98 1.65 1.2 0.95 Natural gas

CH4

5.0%

15.0%

0.55 1.0 0.75 0.55 L.P.G.

Prop+But

1.65∼9.0%

1.85 1.65 1.2 0.95 Hexane

C6H14

1.2%

7.4%

3.0 2.1 1.7 1.2 Hydrogen

4.0%

75.6%

0.069

1.25 1.0 0.8 Methane

CH4

5.0%

15.0%

0.55 1.0 0.75 0.55 Octane

C8H18

1.0%

6.0%

3.9 2.7 2.0 1.5 Pentane

C5H12

1.4%

8.0%

2.5

2,1 1,7 1,2

Propane

C3H8

2.0%

9.5 1.6 1.5 1.1 0.85 Toluene

C7H8

1.2%

3.14 4.0 2.95 2.3

2.1.3. Special precautions for explosive gas detectors

• Cells are sensitive to certain poisons, which can reduce their sensitivity: emission of

silicone-containing vapours at concentrations > 10 ppm and chlorinated or sulphurous products at concentrations > 100 ppm.

• A lack of oxygen (< 15% O2) or over-oxygenation (> 23% O2) may cause under-

measurement (in the former case) or over-measurement (in the latter case).

• Cells must be located head downwards at installation or during maintenance work.

2.1.4. Response to other explosive gasses

It is recommended that the detector is calibrated using the gas to be measured. Users wishing to calibrate the detector using a gas other that detected and factory-programmed should refer to the following table, and use the recommended gas and corresponding coefficient.

Table 1: CALIBRATION COEFFICIENTS

Gas

Empirical

formula

LEL

UEL1

Vapour

density

Coefficient

CH4

But

Example (first row of table): calibration of an Acetone detector using 1% butane (by volume) as the calibrating gas

Value to be displayed: 1% (butane injected) x 100 x 0.95 (Butane/Acetone coefficient) = 63% LEL

1.5% (butane LEL)

N.B.:

Gas recommended for sensor calibration

- LELs vary depending on the source. Those values shown here are taken from European

Standard EN 50054

- Coefficients are accurate to ± 15%

2.2. Technical Specifications and Special Instructions for Oxygen detectors

Fault

2.2.1. Transfer curves for OLCT 20 / OLCT 40 detectors

The following curve shows the transmitter output current value as a function of gas concentration. Where the user connects the transmitter to a device other than a device manufactured by ISC/OLDHAM, he must check that the transfer curve is fully compatible with its input characteristics to ensure that the information generated by the transmitter is correctly interpreted. Equally, the device must supply a suitable power supply voltage, allowing for cable voltage losses.

Output Current in mA

23.2 mA

20.0 mA

Fault

4.0 mA 1 mA

0 %

% O2 concentratio n by volume

30.0 % 36.0%

2.2.2. Metrological details

Maximum concentration 30% O2 Type and number CT5020 CELL Principle 2-electrode electrochemical

(Measurement of oxygen concentration by volume)

Estimated service life 30 months Storage 4°C < T < 12°C

10% < RH < 60%

Temperature range -20°C to +45°C Humidity range 20% RH to 95% RH Pressure range 1 bar ± 10% Accuracy at 20°C 15 to 21% O2 ± 0.5% vol O2

1 to 14% O2 ± 0.6% vol O2

Repeatability < 2% of signal T90 response time < 15 seconds Effect of tempera ture (0 to 40°C) < 0.5% vol O2 Effect of humidity (10% to 90% RH)

The measurement is lower as a result of the air being diluted by water vapour

Sensitivity drift over time < 2% per month Zero stabilisation time following

30 to 60 minutes

power-up

2.2.3. Characteristics and Special precautions for oxygen detectors

• When the sensor is powered up or the measurement cell is replaced, it takes between 30 and

60 minutes for the measurement to stabilise at 20.9% v/v in pure ambient air.

• The use of an oxygen-rich atmosphere (> 25%) can compromise safety.

3. MARKINGS

3.1. Explosion-proof safety version : OLC20d and OLCT20 d OLDHAM Arras

0080

OLC20d or OLCT20d

II 2GD IP66 EEx dIIC T6 (85°C) INERIS 01ATEX0004X Do not open when powered. Serial number, ye ar of manufacture

3.2. Explosion-proof safety version: OLC20d High temperature HT OLDHAM Arras

0080

OLC20d

II 2G EEx d IIC T4 AmbT -25°C + 110°C EEx d IIC T3 AmbT -25°C + 180°C EEx d IIC T2 AmbT -25°C + 200°C

INERIS 01ATEX0004X Do not open when powered. Serial number, year of manufacture

3.3. Intrinsic safety version: OLCT20 i OLDHAM Arras

0080

OLCT20i

II 1 GD IP66 EEx ia IIC T4 (T135°C) INERIS 01ATEX0004X Do not open when powered Serial number, year of manufacture

3.4. Explosion-proof and enlarged safety version : OLC 40 d/OLCT40d

OLDHAM Arras

0080

OLC40d or OLCT40d

II 2GD IP66 EEx e d IIC T6 (85°C) INERIS 01ATEX0006X WARNING : ELECTROSTATIC CHARGES RUB OR WIPE ONLY WITH A WET RAG Serial number, year of manufacture

3.5. Intrinsic safety version: OLCT40 i

For Group I

OLDHAM

0080

OLCT40i

I M1 IP66 EEx ia I INERIS 01ATEX0006X DO NOT OPEN WHEN POWERED

For Group II

OLDHAM

0080

OLCT40i

II 1GD IP66 EEx ia IIC T4 (135°C) INERIS 01ATEX0006X DO NOT OPEN WHEN POWERED Warning : Electrostatic charges : rub or wipe only with a wet rag

34 35

XXII.. AAPPPPEENNDDIICCEESS

Appendix 1

The measuring cell is positioned facing downwards. The physical location of the TRANSMITTER depends on the type of gas to be detected:

• at the high point if the gas is lighter than air,

• at the low point if the gas is heavier than air,

• near outlet vents in the case of mechanical ventilation,

• or, more generally, in locations where the gas is likely to accumulate.

Despite its high degree of protection (IP66), it may be necessary to protect the TRANSMITTER against adverse weather conditions (rain, dust, direct sunlight, etc.) and from direct spraying with cleaning or maintenance products (causing soiling of the detection cell).

The TRANSMITTER must also be positioned so as to allow access to the measuring cell so that it can be replaced.

Detectors must be positioned so as to optimize the detection of accumulations of gas emitted in the air.

Factors to be considered in determining optimal detector positioning:

⇒ potential sources of gas and vapour emissions ⇒ chemical and physical data on gases and vapours which may be present ⇒ liquids with low volatility ⇒ detectors as near as possible to the leak risk area ⇒ type and concentration of gas leaks (high-pressure jet, slow leak, etc.) ⇒ air movements

- indoors: natural and mechanical ventilation

- outdoors: wind speed and direction

⇒ effect of temperature ⇒ installation so as to avoid mechanical damage or deterioration caused by water in summer ⇒ positioning to allow easy maintenance, if possible ⇒ avoiding direct sunlight on the readout area as this would lead to maintenance problems

ISC/Oldham OLC20 Series, OLCT20 Series, OLCT40D Series, OLC20, OLCT40 Series Installation And Use Manual

Specifications and Main Features

Frequently Asked Questions

User Manual