Oldham OLC 100 User manual

(P/N : NPO100GB rev C)

2OLC(T)100
Technical manual
Copyright 2011 by Industrial Scientific – Oldham S.A.S
First edition, French version
All rights reserved. No reproduction of all or part of this document, in any
form, is permitted without the written consent of Industrial Scientific –
Oldham S.A.S.
All of the information that is 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.
Industrial Scientific Oldham S.A.S
Rue Orfila
Z.I. Est – BP 20417
F–62027 ARRAS Cedex
Tel.: [phone]
Fax: [phone]

Content 3
Contents
Chapter 1 | Presentation ........................................................7
Purpose......................................................................................................7
Operating principle.....................................................................................7
Composition of the detector.......................................................................8
Internal elements........................................................................................9
Identifiers..................................................................................................10
Chapter 2 | Ranges...............................................................11
OLC100 and OLCT100 ranges................................................................11
OLCT100 range (Transmitter type)..........................................................12
Chapter 3 | Installation.........................................................13
Necessary equipment ..............................................................................13
Regulations and conditions of use...........................................................13
Electrical power supply ............................................................................14
Transfer curve..........................................................................................14
Location of the detector............................................................................15
Detector positioning .................................................................................15
Connector cable.......................................................................................16
Cable connection .....................................................................................17
Scope of use............................................................................................21
Chapter 4 | Calibration.........................................................22
Necessary equipment ..............................................................................22
Commissioning.........................................................................................22
Stabilization time......................................................................................23
Opening the cover....................................................................................23
Calibrating the OLC100............................................................................24
Calibrating the OLCT100 .........................................................................26
Chapter 5 | Preventive maintenance ...................................31
Frequency of maintenance ......................................................................31
Actions......................................................................................................32

4OLC(T)100
Technical manual
Chapter 6 | Maintenance.......................................................33
Checking the current generator................................................................34
Possible errors .........................................................................................35
Replacing sensor block............................................................................36
Calibration kit............................................................................................38
Chapter 7 | Accessories.......................................................39
Cable gland..............................................................................................41
Chapter 8 | Spare parts.........................................................42
Chapter 9 | Declaration of EC conformity ...........................44
Chapter 10 | Technical specifications..................................46
Dimensional characteristics .....................................................................47
General Specifications .............................................................................48
Catalytic head (OLCT100 XP)..................................................................49
Toximetric heads (OLCT100 XP and OLCT100 IS).................................51
Semiconductor heads (OLCT100 XP) .....................................................53
Infrared head (OLCT100 XP-IR)..............................................................54
Chapter 11 | Specific instructions for use in explosive
atmospheres and operational safety........................................55
General comments...................................................................................55
Metrological performance for the detection of flammable gases.............56
Threaded joints.........................................................................................56
Operational safety....................................................................................56
Reliability data..........................................................................................57
Detector in intrinsically safe "ia" protective mode: Special use conditions..
.......................................................................................................57
Annexe | Ordering information..........................................59
Gas List....................................................................................................59

Limites de responsabilité 5
Thank you for choosing this OLDHAM instrument.
All of the necessary actions have been taken in order to ensure your complete
satisfaction with this equipment.
It is important that you read this entire manual carefully and thoroughly.
The extent of our responsibility
❧INDUSTRIAL SCIENTIFIC 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, installation, or storage of the equipment,
which is the result of not complying with the instructions and warnings, and/or
with the standards and regulations in force.
❧INDUSTRIAL SCIENTIFIC OLDHAM does not support or authorise any
business, person, or legal entity in assuming responsibility on behalf of
INDUSTRIAL SCIENTIFIC OLDHAM, even though they may be involved in the
sale of INDUSTRIAL SCIENTIFIC OLDHAM products.
❧INDUSTRIAL SCIENTIFIC OLDHAM shall not be responsible for any damage,
direct or indirect, or for damages and interest, direct or indirect, resulting from
the sale and use of any of its products UNLESS SUCH PRODUCTS HAVE
BEEN DEFINED AND CHOSEN BY INDUSTRIAL SCIENTIFIC OLDHAM
FOR THE USE THAT THEY ARE INTENDED.
Ownership clauses
❧The drawings, specifications, and information herein contain confidential
information that is the property of INDUSTRIAL SCIENTIFIC 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 INDUSTRIAL SCIENTIFIC
OLDHAM equipment, or for any other reason without the prior consent of
INDUSTRIAL SCIENTIFIC OLDHAM.

6OLC(T)100
Technical manual
Warning
❧This is not a contractual document. In the best interest of its customers and
with the aim of improving performance, INDUSTRIAL SCIENTIFIC OLDHAM
reserves the right to alter the technical features of its equipment without prior
notice.
❧READ THESE INSTRUCTIONS CAREFULLY BEFORE THE FIRST USAGE:
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 INDUSTRIAL SCIENTIFIC OLDHAM by INDUSTRIAL
SCIENTIFIC OLDHAM personnel or by personnel authorised by INDUSTRIAL
SCIENTIFIC OLDHAM.
Guarantee
❧Under normal conditions of use and on return to the factory, parts and
workmanship are guaranteed for 3 years, excluding such consumables as
sensors, filters, etc.
Destruction of the equipment
European Union (and EEA) only. This symbol indicates that, in
conformity with directive DEEE (2002/96/CE) and according to local
regulations, this product may not be discarded together with household
waste.
It must be disposed of in a collection area that is set aside for this purpose, for
example at a site that is officially designated for the 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 as before.

1 - Presentation 7
Chapter1 |Presentation
Purpose
This range of sensors is designed to detect a particular gas depending on the type
of sensor used.
Operating principle
The measurement sensor converts the target gas into voltage or current. This
electrical parameter is:
❧either conducted directly via a connecting cable to a dedicated central
measurement unit (as with the OLC100 explosimeter) that operates on the
principle of the Wheatstone bridge. Such a measurement unit is available in
the OLDHAM range.
❧or amplified, corrected for temperature, linearised, and converted to a 4-20 mA
signal (as for the OLCT100) and conducted via a connecting cable to a
centralized unit (measurement unit or industrial automation system).

8OLC(T)100
Technical manual
Composition of the detector
A detector comprises the following elements:
Id. Description
1. Company label
2. Cover
3. PCB protector (for OLCT version).
4. PCB.
5. Cable gland inlet.
6. Enclosure.
7. Sensor block.
8. Nozzle.
9. Ground connection.
10. LEL sensor (high temperature).
050
Figure 1 : component parts of an OLCT100 detector.

1 - Presentation 9
Internal elements
The following elements are internally accessible to the user:
Id. Description
1. Terminal for the cable being connected to the central unit (measurement unit,
automation).
2. Sensor block connector.
3. Calibration ribbon connector.
4. 4 mA adjustment.
5. Push button access for 4 mA adjustment.
6. Zeroing.
7. Sensitivity adjustment.
OLC100 detector OLCT100 explosimeter OLCT100 detector for toxic
gases
006
Figure 2 : internal view of the detectors.

10 OLC(T)100
Technical manual
Identifiers
The enclosure has two identifier labels, as described below:
Company label
This in turn groups the detector features together:
Id. Description
1. Manufacturer's name
2. Type of product
3. ATEX- IECEx Marking
4. CE symbol and the number of the
organisation that provided the OLDHAM
production quality certification (INERIS)
5. Warning.
6. Type of gas detected and range of
measurement
7. Maximum ATEX certification temperature
(excluding metrological performance)
8. Recycling symbol
008
Figure 3 : Company label.
Side label
This label shows the following :
Id. Description
1.
Thread diameter and pitch for cable inlet
2.
Detector reference number, less sensor (P/N)
3.
Detector serial number (S/N)
010
Figure 4 : side label.

2 – Ranges 11
Chapter2 |Ranges
OLC100 and OLCT100 ranges
The OLC100 range is reserved for the detection of explosive vapor by using a
Wheatstone bridge sensor.
The OLCT100 range of detectors is provided with an amplifier producing a 2 or 3
wire 4-20 mA analog output. These are transmitter detectors and, therefore, the
letter "T".
OLC100
Enclosure Explosion proof
Detection of explosive gases Yes
Detection of toxic gases No
Detection of oxygen No
Detection of CO
2
No
Output 3 voltage wires
Table 1 : OLC100 description.

12 OLC(T)100
Technical manual
OLCT100 range (Transmitter type)
OLCT100XP OLCT100XP-IR OLCT100IS OLCT100HT
Features Explosionproof Explosionproof Intrinsically
safe (1) Explosionproof (2)
Detection of
explosive
gases
Catalytic
sensor (VQ1 or
AP 4F) or semi-
conductor
Infrared sensor
Catalytic sensor
high
temperature
Detection of
toxic gases
Electrochemical
sensor
Or SC
Electrochemical
sensor
Detection of
oxygen
Electrochemical
sensor
Electrochemical
sensor
Detection of
CO
2
Infrared sensor
4-20 mA
output
2 wires for EC
3 wires for SC
3 wires for LEL
3 wires 2 wires 3 wires
(1) Mandatory Zener diode in the line
(2) Sensor movable up to 5, 10, or 15 meters using a high temperature cable..
EC : electrochemical sensor..
SC : semi-conductor sensor.
LEL : explosimeter
AP : poison resistant
Table 2 : comparison of OLCT100 series detectors

3 - Installation
13
Chapter3 |Installation
It is recommended that the guides relating to the installation, use, and
maintenance of flammable gas and oxygen detectors (standard EN/IEC 60079-
29-2) and toxic gas detectors (standard EN 45544-4) should be clearly
understood.
Installation shall be in accordance with the standards in force, classification of the
zone, and in conformity with standards EN/IEC 60079-14 and EN/IEC 61241-14,
the editions in force, or with other national and/or local standards.
Necessary equipment
❧Complete detector assembly
❧Requisite connector cable
❧Multimeter (intrinsically safe, if necessary)
❧Tools
❧Fixing hardware
Regulations and conditions of use
❧The installation should meet all the regulations currently in force for
installations in explosive atmospheres, in particular the standards
IEC/EN 60079-14 and IEC/EN 60079-17 (whichever editions are in force)
or in accordance with other national standards.
❧Generally speaking, the ambient temperature, supply voltage, and power
that are mentioned in this document relate to explosion safety. This has
nothing to do with the operating temperatures of the detector.
❧The instrument is authorized for use in zones 1, 2, 21, and 22 at ambient
temperatures varying from -50°C to + 70°C.
❧The detector sensor in the transmitter should always be in contact with the
ambient air. Therefore:
- Do not cover the detector.
- Do not paint the detector.
- Avoid dust.

14 OLC(T)100
Technical manual
Electrical power supply
Type of detector Supply (V DC)
Maximum
current (mA)
Power consumed
(mW)
OLCT100 XP HT
OLCT100 XP LEL 15,5 to 32 15,5 to 3,2 110 100 1705 1550
OLCT100 XP IR 15,5 to 32 60 930
OLCT100 XP EC 10 to 32 23,5 235
OLCT100 XP SC 15,5 to 32 100 1550
OLC100 By Oldham
central unit 340 (1)
(1) Depends on the central measurement unit.
Transfer curve
The curve shown gives the transmitter
output current as a function of the gas
concentration. If the user connects the
transmitter to a unit other than one that
is provided by ISC Oldham, they
should be certain that the transfer
curve is fully compatible with the input
characteristics of their equipment to
ensure the proper interpretation of the
information provided by the transmitter.
Similarly, the unit should provide
sufficient voltage to compensate for
any voltage drop in the cable.
012
Figure 5: transfer curve for a 4-20 Ma
detector
Output current
(mA)
Measurement
signal (%)
Fault
Fault

3 - Installation
15
Location of the detector
Depending on the density of the gas to be detected or the application, the detector
shall be positioned at the ground level, or on the ceiling at the same height as the
airflow, or near to the air extraction ducts. Heavy gases may be detected at the
ground level, while light gases will be found at ceiling height. Gas densities are
provided on page 30.
Detector positioning
The detector shall be installed with the detector sensor pointing downwards.
For explosive gas detectors only, any tilt of more than 45°from the vertical will
lead to an inaccurate measurement.
014
Figure 6 : sensor pointing downwards (left) and maximum tilt angle for an
explosimeter (right).
Fixture of the enclosure shall be secured with 4 x M6 screws and the appropriate
plugs for the supporting material
016
Figure 7 : fixing template for the enclosure.

16 OLC(T)100
Technical manual
A special holder is available for mounting the detector on the ceiling (see section
on accessories. In the OLCT100 HT version, only the OLC20 HT removable
detector head can be used at temperatures from -20°C to + 200°C.
Only the OLCT100 HT enclosure can be used in ambient temperatures from -
40°C to + 70°C.
The high temperature cable between the OLCT100 HT enclosure and the OLC20
HT head is integral with the instrument and is not user-replaceable.
The cable should be protected mechanically
Connector cable
The detector shall be connected to the central unit (measurement and automation
unit) by a shielded instrumentation cable, armored if necessary. The choice of
cable will be dictated by the particular requirements of the installation, distance,
and type of detector (see table below).
018
Figure 8: the cable connecting the detector to the central unit should be chosen
with care.
018
Type of detector Type of sensor Maximumlength(km)for
cableofcross-section as
indicated
Maximum
load
resistancefor
4-20Ma
0,5mm² 0,9mm² 1,5mm²
Upstreamlinevoltage
(Vcc) 24 24 24
OLCT100 XP
Catalytic or
semiconductor
0,8 1,4 2,4 250
OLCT100 XP(1)
Electrochemical
<4 <4 <4
OLCT100XP-IR
Infra-red
1,4 2,6 4,4 250
OLCT100IS(2)
Electrochemical
1,8 3,3 <4
OLCT100 HT
Catalytic, high
temperature
0,8 1,4 2,4 250
(1) for resistance calculations, the assumed load is 120 Ω for 4-20 Ma.
Central unit
Detector
Connector
cable

3 - Installation
17
(2) for resistance calculations, the assumed load is 120
Ω for 4-20 Ma, and a 300 Ω Zener
blocking diode.
Warning: all wiring should meet the installation standards and should be described in a system
document forSIinstallations
The cable must have a braided screen to reduce the influence of electrical and
radio-frequency interference. A cable such as AFNOR M 87-202 01-IT-09-EG-FA
(Nexans) may be used. It shall be selected according to the type of detector and
in accordance with the table shown hereinabove. Below are further examples of
suitable cables:
Non ATEX zone: CNOMO FRN05 VC4V5-F
ATEX zone: GEUELYON (U 1000RHC1)
ATEX zone: GVCSTV RH (U 1000)
ATEX zone: xx-xx-09/15- EG-SF or EG-FA or EG-PF (U 300 compatible with
M87202)
The maximum permissible length will depend on the cross-section of the cable
conductors (see table) and on the minimum supply voltage.
Cable connection
Switch off line power supply
On the central unit:
1. Inhibit any installation alarms to avoid unexpected triggering during operation.
2. In accordance with the manufacturer’s instructions, switch off the power to the
module in order to be connected to the detector.
Cable preparation
The cable shall be taken from the central unit (measurement and automation) to
the point of measurement (see Figure 8). The passage, support, and protection of
the cable shall be according to best practice
Cable passage
It is essential that the instructions provided by the manufacturer of the
compression gland are followed and the braided screen is correctly connected.

18 OLC(T)100
Technical manual
Armored cable Unarmored cable
Note : If the instructions so indicate, the cable may be anchored either inside the housing, or outside of it,
and next to the cable gland
052
Figure 9 : example of connection of armored and unarmored cable.
054
Figure 10 : implementation of a cable entry type of "simple compression.
Cable connection
The connection of the cable between the detector and central unit should be
made with the power off. The site should be at equal potential
Connect the cable to the detector side before connecting the central unit side.
After the wiring has been completed, connect the cable screen to the ground
terminal of the central unit.

3 - Installation
19
022
Figure 11 : connections for a 2-wire 4-20 Ma detector.
024
Figure 12 : connections for an intrinsically safe, 2-wire 4-20 Ma detector with a
Zener diode.
023
Figure 13 : connections for a 3-wire 4-20 Ma detector.

20 OLC(T)100
Technical manual
026
Figure 14 : connections for a 3-wire OLC100 type detector
Connecting the enclosure to ground
Connect the enclosure ground terminal to earth according to the regulations. This
ground connection may, however, be taken from the terminal on the screw fixing
the PCB to the inside of the housing.
028
Figure 15 : Ground connection terminal.
Closing the cover
Before connecting the cable to the terminal on the central unit, it is essential that
the cover is completely closed.