Oldham olct ir User manual

1
The Fixed Gas Detection Experts
TECHNICAL MANUAL
OLCT IR
INFRARED DETECTOR
FOR FLAMMABLE GASES OR
CO2
Part Number : NPOIRGB
Revision : G.0

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User manual
Copyright April 2016 by Oldham S.A.S.
All rights reserved. No reproduction of all or part of this document, in any
form, is permitted without the written consent of 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.
Oldham S.A.S.
Rue Orfila
Z.I. Est –CS 20417
F–62027 ARRAS Cedex
Tel.: [phone]
Fax: [phone]

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GAS DETECTION
Thank you for purchasing an OLDHAM instrument. We appreciate your business.
We trust that our commitment to the technical excellence of our products will ensure your complete
satisfaction.
Please read the following document carefully.
L I M I T A T I O N O F L I A B I L I T Y
* OLDHAM will not be liable under any circumstances for material losses, personal injury or death resulting in whole
or in part from the inappropriate use of this equipment, the installation or storage of this equipment not in
conformance with the instructions and warnings presented in this manual and/or not in conformance with current
standards and regulations.
* OLDHAM neither condones nor authorizes any other company, individual or legal entity to make any claims as to the
liability of OLDHAM, even if said company, individual or legal entity is directly involved in the sale of OLDHAM
products.
* In no event will OLDHAM be liable for any direct or indirect damage including those resulting from the sale and the
use of its products IF THOSE PRODUCTS WERE NOT SPECIFIED AND SELECTED BY OLDHAM FOR
SUCH USE.
O W N E R S H I P C L A U S E S
* The images, blueprints, specifications and information contained in this document belong to OLDHAM.
* This information may not be physically, electronically or otherwise reproduced, copied, disclosed, or translated, either
in part or in whole, or used in the manufacturing or sale of OLDHAM equipment, nor for any other reason without
prior permission from OLDHAM.
W A R N I N G S
* This document is not contractual. On behalf of its clients, OLDHAM reserves the right to modify the technical
characteristics of its equipment without notice to improve product performance.
* CAREFULLY READ THIS DOCUMENT BEFORE USING THE PRODUCT: this document should be
carefully read by any individual who has or who will have the authority to use, maintain or repair this equipment.
* Any and all warrantees and performance claims will only be valid if the equipment is operated, maintained and
repaired in accordance with OLDHAM directives, by OLDHAM personnel or by personnel appointed by
OLDHAM.
W A R R A N T Y
*Five-year return to factory warranty under normal operating conditions on parts and labor; consumable materials
excluded (sensors, filters, etc.).

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User manual
D I S P O S A L
For the preservation, protection and improvement of environmental quality, and for the protection of human health and
the prudent and rational utilization of natural resources, the OLCT IR must be disposed of separately from electronic
equipment and cannot be disposed of with normal household waste. The user therefore has an obligation to separate the
OLCT IR from other waste to ensure that it is recycled safely for the environment.For further details on existing
collection sites, contact the local administration or seller of the product.

Contents
1
CONTENTS
Figure 1..................................................................................................................................................................... 0
Figure 2..................................................................................................................................................................... 1
Figure 3..................................................................................................................................................................... 2
Figure 4..................................................................................................................................................................... 3
Figure 5..................................................................................................................................................................... 4
1. INTRODUCTION ........................................................................................................................................... 6
2. TECHNICAL SPECIFICATIONS(1) ..................................................................................................................... 8
2.1 INTERFERENCE OF COMMON GASES ON OLCT IR (CH4AND HC) .............................................................................. 9
3. INSTALLATION ........................................................................................................................................... 12
4. START UP................................................................................................................................................... 12
5. MAINTENANCE .......................................................................................................................................... 14
5.1 CORRECTIVE MAINTENANCE............................................................................................................................. 14
5.2 PERIODIC MAINTENANCE ................................................................................................................................ 14
6. LIST OF ACCESSORIES................................................................................................................................. 18
7. SPECIAL INSTRUCTIONS FOR USE IN ATEX EXPLOSIVE ATMOSPHERES AND FOR FUNCTIONAL SAFETY...... 20
7.1 USE IN ATEX EXPLOSIVE ATMOSPHERES............................................................................................................. 20
7.2 FUNCTIONAL SAFETY...................................................................................................................................... 21
8. MARKING: ................................................................................................................................................. 22
9. MANUFACTURER’S DECLARATION OF CONFORMITY ................................................................................. 24

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User Manuel

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User Manual
OLCT IR
Avec coiffe anti-
projection
OLCT IR
with weather protection
Ground
screw
(See Special instructions for use in ATEX
explosive atmospheres)
Cable gland, M20x1.5, optional
Fastening lug
Figure 1

REP
NBR
DESIGNATION
REF OFSA
1
1
WEATHER PROTECTION
6313862
2
1
O-RING DIA. DIAM=65x3
6136242
3
1
LOCKING NUT M5
6903376
4
1
TERMINAL COVER
6123723
6
2
Ex TERMINAL
6152989
7
1
O-RING DIA DIAM=69x2
6135036
8
1
LED PCB
6451495
OPTION
5
1
CABLE GLAND, M20, ARMOURED CABLE OR
CABLE GLAND, M20, NON-ARMOURED CABLE
6343489
6343493
OLCT IR
Exploded view
Figure 2

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User Manual
OLCT IR
Terminal block
Iout
0V
+24VDC
Ser
the electric wires will be equipped
with a crimped end
Connection
Iout
Output signal in mA (terminal 1of OLDHAM
central units)
0V
Power supply 0 V (terminal 2 of OLDHAM
central units)
+24VDC
Power supply +(terminal 3 of OLDHAM
central units)
Ser = service (do not use)
LED
Magnetic receiver
Cable gland M25 x 1.5, optional
(See: Special instructions for use in
ATEX explosive atmospheres)
Figure 3

/M25
OLCT IR
with by-pass adaptor
(calibration cup)
GAS INLET AND
OUTLET
BY-PASS ADAPTOR
Ground
screw
Fastening lug
Cable gland, M20
Figure 4

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User Manual
Bracket (P/N 6322420)
Ceiling mount for OLCT IR
Figure 5

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User Manual
1. INTRODUCTION
The OLCT IR gas detector is designed to monitor flammable gases or CO2concentrations in the ambient air.
The infrared technology used by the OLCT IR guarantees extreme detection accuracy.
Powered with 24 Vdc, the OLCT IR provides a standard 4-20 mA analog output which is proportional to the
measured concentration of gas. It features a non-intrusive calibration that enables calibration in hazardous area without
declassifying the zone.
The OLCT IR detector can be used in gas and dust explosive atmospheres and meets all of the essential
requirements of the ATEX 94/9/EC European Directive and following European EN and international IEC standards:
-EN 60079-0:2012 IEC 60079-0 (ed.6):2011
-EN 60079-1:2007 IEC 60079-1 (ed.6):2007
-EN 60079-7:2007 IEC 60079-7 (ed.4):2006
-EN 60079-11:2012 IEC 60079-11 (ed.6):2011
-EN 60079-31-2014 IEC 60079-31 (ed.2):2013
Company label
The enclosure has two identifier labels, as described below
id.
Description
Firmplate
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.
Maximun ATEX certification temperature
(excluding metrological performance)
7.
Recycling symbol
8.
Detector serial number (S/N). The first two
digits (in this case 09) correspond to the
year of manufacture (in this case 2009)
9.
Thread diameter and pitch for cable inlet
091214Y-903
3
7
4
5
8
1
2
6
9

1 - Introduction
7
The OLTC IR is available in various configurations:
Methane Version (CH4):
-% LEL: optimized for methane detection, standard range is 0-100% LEL (0-5% vol.). The range can be
adjusted to 0-4.4% vol. for those who consider this value as the lower explosive limit for methane.
-% Vol.: detection of methane from 0 to 100% vol.
HC Version:
-Optimized for the detection of saturated hydrocarbons (propane, butane, pentane, hexane, ethanol, etc.). The
standard range is set in factory:
C3H8–0 to 100% LEL
C4H10 –0 to 100% LEL
C2H6O –0 to 100% LEL
C6H14 –0 to 100% LEL
CO2 Version:
- Optimized for CO2detection from 0 to 3% vol.

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User Manual
2. TECHNICAL SPECIFICATIONS(1)
Detection method
Infrared absorption
Gases detected(3)
(set in factory)
Methane,Propane, Butane, Hexane, Ethanol(2)
CO2
Range (typical)
100% LEL CH4, C3H8, C4H10
100% volume CH4
3% volume CO2
Accuracy
+/-3% LEL CH4or +/- 5 % of measurement
+/-2% LEL HC or +/- 3 % of measurement
Long term stability at operating temperature
from -25°C to +55°C
zero: +/-1 LEL
gain : +/-5% LEL or +/- 10% of measurement
Response time without weather protection
with weather protection
T50 < 7 seconds - T90 < 8 seconds
T50 < 10 seconds - T90 < 16 seconds
Voltage
16 to 30 VDC
Average Consumption
2.5 W typical (max intermittent current = 500 mA)
Signal Output
Source signal encoded from 0 to 25 mA (non-isolated):
4 to 20 mA: linear and proportional to gas measurement
0 mA: electronic fault or power loss
0.5 mA: dirty optics, temperature is out of specification
1 mA: detector fault
2 mA: calibration mode
> 23 mA: out of range
Wiring
3-wire shielded cable
Load resistance (with OLDHAM controller)
8 Ohm in loop (250 meters with 1.5 mm² core size cable)
Max. output load resistance
300 Ohm
Cable entry
M20 x1.5 (cable gland in option, See special instructions for use
in ATEX explosive atmospheres )
Cable diameter
Armoured cable: Outer diameter 8.5 to 16 mm
Inner diameter 6 to 12mm
Unarmoured cable: Inner diameter 6 to 12mm
Operating Temperature
-25°C to 55°C by default
(-50°C to +55°C available upon request)
Storage temperature:
-50°C to 55°C
Electromagnetic Compatibility
Complies with EN 50270:06 Types 1 and 2
IP Rating
IP 66 –IP 67
ATEX
Complies with the European Directive ATEX 94/9/EC and IEC
Ex Scheme (see attached declaration)
Weight
1.6 Kg
Materials
INOX 316L
Humidity
0 to 99% RH (noncondensing)
Pressure influence
Measurement: partial pressure
(1) Due to the continual improvement of our products, OLDHAM reserves the right to modify the product
specifications listed in this document at any time.
(2) The majority of organic components comprising C-H bonds
(3) Hydrogen is not detected. Saturated hydrocarbons are more sensitive than CH4(typically 5 to 7 times more),
while Unsaturated and Benzenic Hydrocarbons are less sensitive than CH4.
Warning: Acetylene and Ammonia have a negative cross sensitivity on the measurement. Above 2,000 ppm
acetylene or 10,000 ppm ammonia, the presence of other gases may be masked.

2 –Technical specifications
9
OLCTIRCH4calibré CH4: Interférence des principaux alcanes & alcools
0,0
10,0
20,0
30,0
40,0
50,0
60,0
70,0
80,0
90,0
100,0
0,0
10,0
20,0
30,0
40,0
50,0
60,0
70,0
80,0
90,0
100,0
Conc [% LEL]
Méthane CH4
Propane C3H8
Butane C4H10
Hexane C6H14
Nonane C9H20
Cyclohexane C6H10
Méthanol CH3OH
Ethanol C2H6O
% LEL CH4
2.1 Interference of common gases on OLCT IR (CH4and HC)
Any organic molecule with at least one C-H bond except for acetylene can potentially be detected by the OLCT IR,
though the sensitivity varies.
Note the following:
Regardless the detector version, saturated hydrocarbons give a greater response than CH4;
The OLTC IR CH4 is more sensitive to CH4 and less sensitive to hydrocarbons than the OLCT IR HC;
With regards to the OLCT IR CH4, a signal of 20mA corresponds to 100% LEL CH4or 20% LEL C3H8
(factor 5);
With regards to the OLCT IR HC, a signal of 6.4mA signals corresponds to 100% LEL CH4or 14% LEL
C3H8 value (factor 7);
The OLCT IR HC is usually more suitable for the detection of saturated molecules such as alkanes,
alcohols, ketones, organic acids, esters and ethers.
The OLCT IR CH4is usually more suitable for the detection of unsaturated hydrocarbons such as alkenes
and aromatics with H-C bonds although they give less signal than CH4
As an example, see below the response curves for common HCs (accuracy is +/-15 %).
OLCT IR CH4
OLCTIR CH4 calibrated to CH4: Interference of the main alkanes and alcohols
Conc [% LEL]
Methane CH4
Propane C3H8
Butane C4H10
Hexane C6H14
Nonane C9H20
Cyclohexane C6H10
Methanol CH3OH
Ethanol C2H6O
% LEL CH4

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User Manual
OLCT IR HC (propane calibration)
OLCT IRHC calibré C3H8: Interférence des principaux alcanes & alcools
0,0
10,0
20,0
30,0
40,0
50,0
60,0
70,0
80,0
90,0
100,0
0,0
10,0
20,0
30,0
40,0
50,0
60,0
70,0
80,0
90,0
100,0
Conc [% LEL)
Méthane CH4
Propane C3H8
Butane C4H10
Hexane C6H14
Nonane C9H20
Cyclohexane C6H10
Méthanol CH3OH
Ethanol C2H6O
% LEL C3H8
OLCT IR HC calibrated to C3H8 : Interference of the main alkanes & alcohols
Conc [% LEL]
Methane CH4
Propane C3H8
Butane C4H10
Hexane C6H14
Nonane C9H20
Cyclohexane C6H10
Methanol CH3OH
Ethanol C2H6O
% LEL C3H8

2 –Technical specifications
11

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User Manual
3. INSTALLATION
WARNING: Before proceeding refer to paragraph #7, “Specific Instructions for Assembly in Explosive Atmospheres”.
Safety Precautions
The detector must be installed in an appropriate location to enable optimal protection.
The OLCT IR shall be mounted horizontally so that the arrow on the weather protection looks upward.
If mounted incorrectly, the OLCT IR detector may not be able to detect gases or vapors in the air.
Mechanical installation
-Follow carefully the safety instructions outlined above
-Look at figures 1 and 4 for the dimensions of the OLCT IR
-The OLCT IR detector is intended to be mounted on a vertical support structure, such as a wall. When it
has to be mounted on a horizontal surface, use the ceiling mount (part number 6322420, see Fig. 5).
Electrical installation
-Ensure that the installation complies with currently enforced standards, EN/IEC 60079-14, EN/IEC 60079-
17 standards, zone classification, and all other enforced editions or national standards.
-To ensure proper operation of the detector, the cable resistance must remain within the limits specified in
the technical specifications table.
-Make sure the power supply at detector terminals is between 16 and 30 VDC
-Remove the weather protection (see Rep. 4, Fig. 2) to access the terminal block
-Connect the 3 active wires as shown in Fig. 3
-Replace the protective cover
-Ground the detector casing (Fig. 1)
4. START UP
-Verify that all equipment connections and installations have been performed correctly.
-To avoid false alarms, inhibit the controller or the PLC.
-Power up the OLCT IR and wait 2 or 3 minutes for stabilization (during warming-up, the signal output is
set to 2 mA)
-Check the zero (4 mA) and gas response. When zeroing a CO2version, apply nitrogen.