ISC/Oldham OLC20 Series Quick start guide

D
De et te ec ct to or rs s
OLC20
T
Tr ra an ns sm mi it tt te er rs s
OLCT20 –OLCT 40
Installation and use
Ref.: CD00004
Code: 06_MT_OLC/OLCT 20-40_GB_24_11_06

3
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 totalsatisfaction.
Now it is important to read this document carefully.
E
EX XT TE EN NT T O OF F R RE ES SP PO ON NS SI IB BI IL LI IT TY Y
*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 sale or use of any of its productsIF THESE PRODUCTS HAVE NOT BEEN
DEFINED AND CHOSEN BY ISC/OLDHAM FOR THEIR SPECIFIC USE.
C
CL LA AU US SE ES S C CO ON NC CE ER RN NI IN NG G P PR RO OP PE ER RT TY Y
*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
W
WA AR RN NI IN NG GS S
*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
G
GU UA AR RA AN NT TE EE E
2 years guarantee in normal conditions of use on parts and technical labour, return in our workshops, excluding
consumables (sensors, filters, etc.)

4
A
Dimensions OLC/OLCT 20 Cable length 0.4 m
A
Dimensions OLC/OLCT 20D 2 or 3 conductor remote cable
Length 5, 10 or 15 m
A
FIG 2
FIG 1
A

5
FIG 3

6
ABCD
Casing EEx e Cable gland PG9
for ∅6mm to ∅
12 mm cable
Junction box
approved EEx e Detector OLCT 20
Dimensions and fixing OLCT 40
A
C
B
D
FIG 4
OLCT40
FIG 5

7
ABCD
Casing EEx e Cable gland PG9 for ∅6mm
to ∅11 mm cable Shielded cable
Length10 m Remote detector
A
B
C
D
FIG 6

8
1
2
3
ABCDEF
ISC/OLDHAM
control unit Detector or transmitter Earth shielding + power supply
-power supply Signal (I)
3
+ +
1
--
ABCDE
ISC/OLDHAM
control unit Transmitter Earth shielding + power supply -power supply
ABC
Control unit Transmitter ZENER Barrier
C
1
2:
3
:
B
F
E
D
A
FIG 7
FIG 9
Dangerous area
Safe area
C
B
A
D
E
C
B
AFIG 8

9
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

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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

I
I. . D De es sc cr ri ip pt ti io on n o of f t th he e O OL LC C / / O OL LC CT T2 20 0 f fa am mi il ly y
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:
Øversion OLC20 or OLCT20
−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 housing equipped with a
cable with a standard length of 40 cm.
Øversion OLC20D or OLCT20D (D signifies remote version)
−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.
OLC20 OLC20D

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2. Main characteristics of the various versions
OLC20 OLC20D
OLCT20 OLCT20D
EXPLO EXPLO EXPLO TOX/O2 EXPLO TOX/O2
Explosion-proof safety housing XXXXXX
Intrinsic safety housing XX
Outlet via packing gland1XXXXXX
3-wire cable / Wheatstone bridge XX
3-wire cable / 4-20 mA output XX
2-wire cable / 4-20 mA output XX
Catalytic cell XXXX
Electrochemical cell XX
Interchangeable unit XX
Interchangeable and precalibrated unit
XXXX
Wall mounting bracket XXX
1On request, the OLCT20 transmitter type in intrinsic safety version can be delivered with a sealed cable.

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I
II I. . D De es sc cr ri ip pt ti io on n o of f t th he e O OL LC CT T4 40 0 / / O OL LC CT T4 40 0D D f fa am mi il ly y
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:
ØVersion 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.
ØVersion 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 manual.
2. Main characteristics of the various versions
OLCT40 OLCT40D
EXPLO TOX/O2 EXPLO TOX/O2
Explosion-proof safety cell unit XXXX
Intrinsic safety cell unit XX
Outlet via packing gland XXXX
3-wire cable / 4-20 mA output XX
2-wire cable / 4-20 mA output XX
Catalytic cell XX
Electrochemical cell XX
Interchangeable and precalibrated unit
XXXX
Wall mounting bracket of the cell unit
XX

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I
II II I. . M Me ec ch ha an ni ic ca al l i in ns st ta al ll la at ti io on n o of f t th he e v va ar ri io ou us s v ve er rs si io on ns s
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.
I
IV V. . W Wi ir ri in ng g o of f t th he e v va ar ri io ou us s v ve er rs si io on ns s
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)

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V
V M Ma ai in nt te en na an nc ce e
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 .

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Important note regarding version OLC 20 High Temperature Detector
§The OLC20 HT sensor is powered by a DC supply from 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 actionon site.
-After removing the cell block fromthe transmitter, calibration is performed using a
calibrating bench provided for that purpose.
Note:
To operate this bench, see the operating procedure supplied with it.

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Calibrating procedure
Procedure to be followed after obtaining all necessary
authorisations to conduct work on site
On the data logger On the TRANSMITTER(1)
Switch off the measuring channel
Switch the measuring channel back on and
make sure that it is working properly,
after stabilizing the measurement.
1Reminder: Transmitters OLCT20(D) and OLCT4O(D) use the same cell unit.
1 : Rotate the unit
through ¼ turn
2 : Extract it
1
2
Reinstall the same newly calibrated unit or
a
replacement unit and reinstall the whole
assembly.
Loosen the
locking screw
-Disconnect the
connector
linking the cell
unit to the
transmitter
body.

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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.
-Adjustment of 0 in
clean air, using
potentiometer (item 1).
-Adjustment of
sensitivity (with
standard gas), using the
potentiometer (item 2).
item 1
item 2

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V
VI I. . L Li is st t o of f s sp pa ar re e p pa ar rt ts s
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
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6313706
6313707
6313708
6313710

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2 Intrinsic safety cell units OLCT 20/20 D and OLCT40/40D
INTRINSIC SAFETY CELL
UNITS (SI) REFERENCES
CELL UNIT OLCT20SI CO–100PPM
CO–300PPM
CO –1000 ppm
CELL UNIT OLCT20SI H2S–30 PPM
H2S–100PPM
H2S –1000 ppm
CELL UNIT OLCT20SI NO –100 PPM
NO –300 PPM
NO –1000 ppm
CELL UNIT OLCT20SI NO2–10 PPM
NO2–30 PPM
CELL UNIT OLCT20SI SO2–10 PPM
SO2–30 PPM
SO2 –100 ppm
CELL UNIT OLCT20SI H2 –2000PPM
CELL UNIT OLCT20SI NH3–100PPM
NH3–1000PPM
CELL UNIT OLCT20SI HCL–30 PPM
HCL–100PPM
CELL UNIT OLCT20SI HCN –10PPM
HCN –30PPM
CELL UNIT OLCT20 SI CL2-10PPM
CELL UNIT OLCT20SI O3 -1 ppm
CELL UNIT OLCT20SI COCL2 -1 ppm
CELL UNIT OLCT20SI PH3 -1 ppm
CELL UNIT OLCT20SI ASH3 -1 ppm
CELL UNIT OLCT20SI HF -10 ppm
CELL UNIT OLCT20SI ClO2 -3 ppm
CELL UNIT OLCT20SI ETO -30 ppm
CELL UNIT OLCT20SI SiH4 -50 ppm
CELL UNIT OLCT20SI O2 –30% vol
6313711
6313712
6313713
6313716
6313717
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