User Manual
OLC 10
OLCT 10
Analog
Gas Detector
Part Number : NPO10GB
Revision : H.0
The Fixed Gas Detection Experts
2
GAS DETECTION
We are delighted that you have chosen an 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.
E X T E N T O F R E S P O N S I B I L I T Y
* 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.
* OLDHAM neither supports nor authorises any company, physical or moral person to assume responsibility on
behalf of OLDHAM, even if it is involved in the sale of OLDHAM products.
* 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 products IF THESE PRODUCTS HAVE NOT BEEN
DEFINED AND CHOSEN BY OLDHAM FOR THEIR SPECIFIC USE.
C L A U S E S C O N C E R N I N G P R O P E R T Y
* Drawings, plans, specifications and information included in this document contain confidential information that is
the property of 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 OLDHAM equipment or for any other reasons without
prior consent from OLDHAM.
W A R N I N G S
* This document is not contractually binding. In the interests of its customers, 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 OLDHAM directives, by OLDHAM personnel or by personnel approved by OLDHAM.
G U A R A N T E E
2 years guarantee in normal conditions of use on parts and technical labour, return in our workshops, excluding
consumables (sensors, filters, etc.).
4
TABLE OF CONTENTS
I. PRESENTATION OF DIFFERENT VERSIONS................................................................. 7
Different versions available .......................................................................................................... 7
II. MECHANICAL INSTALLATION OF DIFFERENT VERSIONS, DIMENSIONS AND
MOUNTING ............................................................................................................................. 7
III. ELECTRICAL INSTALLATION OF DIFFERENT VERSIONS ...................................... 9
1. Connection of OLC 10, OLCT 10 EXPLO or OLCT 10 SC (Semi-Conductor) to a
controller for combustible gas detection: ............................................................................... 9
2. Connection of two OLC 10 TWIN to a controller ............................................................... 10
3. Connection of two OLCT 10 TOX (maximum 5) to a controller for detection of the same
toxic gas ............................................................................................................................... 11
4. Connection of two OLCT 10 TOX networks (5 detectors max. per network) for detection
of two different toxic gases or monitoring of two conjoined areas to a two-channel
controller .............................................................................................................................. 12
IV. MAINTENANCE.................................................................................................................... 13
1. Periodic maintenance with an OLC 10 detector (comb. gas) .............................................. 13
2. Periodic maintenance with an OLC 10 TWIN transmitter (comb. gas) .............................. 13
3. Periodic maintenance with an OLCT 10 transmitter (comb. or toxic gas) .......................... 13
4. Periodic maintenance with several OLCT 10 transmitters for toxic gas ............................. 15
5. Sensor replacement .............................................................................................................. 15
6. Scrapping ............................................................................................................................. 15
V. TECHNICAL SPECIFICATIONS ....................................................................................... 17
1. TECHNICAL SPECIFICATIONS - OLC 10 / OLC 10 Twin ............................................ 17
2. TECHNICAL SPECIFICATIONS - OLCT 10 Explo Transmitter ..................................... 18
3. TECHNICAL SPECIFICATIONS - OLCT 10 CO Transmitter ......................................... 19
4. TECHNICAL SPECIFICATIONS - OLCT 10 SC Transmitter .......................................... 20
5. TECHNICAL SPECIFICATIONS - OLCT 10 NO Transmitter ......................................... 21
6. TECHNICAL SPECIFICATIONS - OLCT 10 NO2 Transmitter ....................................... 22
VI. DETAIL SPECIFICATIONS FOR USE IN EXPLOSIVE ATMOSPHERES IN
ACCORDANCE WITH THE ATEX 94/9/CE EUROPEAN DIRECTIVE...................... 23
1. Specifications for installation in ATEX Zone 2G ............................................................... 23
2. Metrological specifications for OLC 10 combustible gas detector ..................................... 23
2.1. Special precautions ........................................................................................................ 23
2.2. Reactions to other combustible gases ............................................................................ 23
3. MARKING .......................................................................................................................... 24
3.1. Version OLC 10 / OLC 10 Twin..................................................................................... 24
3.2. Version OLCT 10 ........................................................................................................... 24
VII. DECLARATIONS OF CONFORMITY .............................................................................. 25
6
104 mm
I. PRESENTATION OF DIFFERENT VERSIONS
The OLC 10, OLC 10 TWIN and OLCT 10 EXPLO combustible gas detectors are detectors fitted with catalytic
sensors and intended for use in boiler rooms and parking lots.
The OLCT 10 TOX gas detectors are 4-20mA transmitters equipped with electrochemical sensors and especially
designed to detect toxic gases in commercial and light industrial applications (parking lots, boiler room, etc).
Different versions available
- OLC 10: combustible gas
- OLC 10 TWIN: combustible gas
- OLCT 10 EXPLO: combustible gas (transmitter version, 4-20 mA output)
- OLCT 10 TOX: toxic gas (transmitter version, 4-20 mA output)
II. MECHANICAL INSTALL ATION OF DIFFERENT
VERSIONS, DIMENSIONS AND MOUNTING
The OLC/OLCT 10 gas detectors-transmitters are mounted vertically with the cable entries positioned downwards.
Drill two holes 104 mm apart on the base to mount the units.
8
1 2 3
1 2 3
e.g., CONTROLLER MX 15
Connect the 3 wires based on the
Connect the 3 wires based on the
1= signal*
1
OLC 10
OLCT 10
III. ELECTRICAL INSTALLATION OF DIFFERENT
VERSIONS
1. Connection of OLC 10, OLCT 10 EXPLO or OLCT 10 SC (SemiConductor) to a controller for combustible gas detection:
Notes: - The controller configuration will be different based upon the use of an OLC 10 or OLCT 10
- Cable to be used: 3 conductors, 3x1 mm² LiYCY type
corresponding numbering on the
sensor.
2
3
*analog signal 4-20 mA (I out) on OLCT 10.
corresponding numbering on the
controller.
2= -
3= +
EXPLO
2. Connection of two OLC 10 TWIN to a controller
Connect the 3 wires based on the
Connect the 3 wires based on the
Connect the 4 wires based on the
1
3
1= signal
3= +
IN
4 3 2 1
MX 15 CONTROLLER
OUT
4 3 2 1
IN
OUT
4 3 2 1
4 3 2 1
1 2 3
Cable to be used: 3 and 4 core cable, 3x1 mm² and 4x1 mm² LiYCY type
corresponding numbering on the
controller.
corresponding numbering on the
first sensor.
corresponding numbering on the
previous and the following sensor.
2
2= -
10
IN
1 2 3
IN OUT
CONTROLLER MX15 for example
1 3
3 1 3 1 3 1 3 1
Connect the 2 wires based on the
Connect the 2 wires based on the
Connect the 2 wires based on the
1
3 1 3 1 3
1= Iout
OLCT 10 TOX
3 1 3 1
3. Connection of two OLCT 10 TOX (maximum 5) to a controller
for detection of the same toxic ga s
Cable to be used: One pair (0.75 mm²) screened cable
corresponding numbering on the
first sensor.
corresponding numbering on the
controller.
corresponding numbering on the following
sensor.
3= +Vdc
Note: the free terminals allow the connection of another network of OLCT 10 TOX.
COMMENTS:
- the number of OLCT 10 toxic gas detectors shall be configured on the controller,
- the signal read by the controller is the average of the “n” detectors. As a result, a signal fault may not be
detected.
In the event that 2 networks are used, it is cost-effective to use a single cable (2 pairs) subject to compliance with
wiring as follows:
4. Connection of two OLCT 10 TOX networks (5 detectors max.
Example: one zone, 2 gases
Detector 1
Detector 2
Detector 3
Detector 4
Cable with 4
wires
Channel 1
Channel 2
MX 32
per network) for detection of two different toxic ga ses or
monitoring of two conjoined areas to a two-channel controller
Cable to be used: Two pairscreened cable (0.75 mm²)
controller
Controller with 2 channels at minimum
Information for this example:
- channel 1 is a channel connected to two sensors for detection of CO
- channel 2 is a channel connected to two sensors for detection of NO
- detector 1 (CO) also acts as junction box for detector 2 (NO)
- detector 2 (NO) also acts as junction box for detector 3 (CO)
- detector 3 (CO) also acts as junction box for detector 4 (NO)
12
IV. MAINTENANCE
Caution: The actions described in this paragraph are intended for authorized and trained individuals who are
likely to question the detection safety.
Gas detection instruments are potential life-saving devices. Recognizing this fact, OLDHAM recommends that a
functional “bump” test be performed on every fixed gas-monitoring instrument 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.
Bump test frequency depends on application, field conditions, exposure to gas, sensor technology, and environmental
conditions. For new installations it may be prudent to carry out bump tests frequently at first, increasing the time
intervals as confidence grows with experience in the installation concerned, on the basis of the maintenance record. The
maintenance test interval should not be more than 3 months.
If an instrument fails to operate properly during any functional “bump” test, a full instrument calibration should be
performed successfully prior to use. Calibration frequency will be based on bump tests results. However it cannot be
more than 12 months.
These recommendations are based on safe work procedures, industry best practises, and regulatory standards to ensure
worker safety. OLDHAM is not responsible for setting safety practices and policies.
1. Periodic maintenance with an OLC 10 detector (comb. gas)
- The “maintenance” position was selected on the controller in order to disable its relays (see manual of relevant
product)
Reminder: make sure the detector is in clean air - otherwise inject zero air on the detector (with calibration kit)
with a flow rate of 60 l/h, then wait for the stabilisation of measurement
- Perform the zero setting of the controller (see manual of relevant product)
- Now inject the calibration gas (flow rate 60l/h) into the OLC 10 sensor and wait for signal stabilisation on the
controller display
- If necessary, calibrate the sensitivity using the “S” potentiometer of the controller (see manual of relevant
product)
- Upon completion of calibration: wait for the “return to zero” on the controller display
Return to the “normal” mode of the controller (see manual of relevant product)-
2. Periodic maintenance with an OLC 10 TWIN transmitter (comb.
gas)
- The procedure is almost identical to point 1 (OLC 10), with the exception of sensitivity adjustment which is
performed on the OLC 10 TWIN detector that is less sensitive.
- To determine the least sensitive detector, inject gas on the two detectors, one after the other (wait for the signal
to read zero). The detector that gives the lowest measurement is the less sensitive.
3. Periodic maintenance with an OLCT 10 transmitter (comb. or
toxic gas)
- It is required that the kit provided by OLDHAM be used (P/N 6147872)
- Remove the end-cap that provides access to settings, located on the right side of the sensor
- Connect this kit on the male plug of the circuit, as indicated below:
MAINTENANCE CONNECTOR WIRES:
ZERO (4mA) potentiometer SENSITIVITY (20mA) potentiometer
S Signal
+VDC
+ 4-20 mA
- 4-20 mA
Ref 2.5V
GND
V
voltmeter
CHANGER-OVER
Voltmeter
Read on the voltmeter 400mV for 4mA and 2000mV for 20mA
- +VDC/red = + power supply
- - 4-20 mA/blue = - of voltage, image of 4-20mA
- + 4-20 mA/green = + of voltage, image of 4-20mA
- S Signal /yellow = signal from 0mV to 1600mV for zero and sensitivity setting
- Ref 2.5 V/gray = zero reference for reading of signal from 0mV to 1600mV
- GND/black = electronic circuit ground.
- Toggle the changer-over (under the connector) on «CAL» position (to the right)
Caution: after 9 minutes the transmitter automatically returns to normal operation! (only version OLCT
10 explo)
Reminder: make sure the detector is in clean air - otherwise inject zero air or nitrogen on the sensor at a flow
rate of 60 l/h – and wait for the stabilisation of the measurement given by the voltmeter.
- Set the ZERO using the zero potentiometer to read 0 mV on the voltmeter
- Now inject the calibration gas (60l/h), wait for the signal stabilisation on the voltmeter
- If required, set the sensitivity using the “S” potentiometer to read 1,600mV for the full scale (corresponding to
20mA)
- Note: if you use a gas concentration lower than 100% of the scale, calculate (rule of three) and adjust to obtain
the corresponding value (from 0 to 1600 mV)
- Stop calibration gas injection (remove the calibration cup)
- Wait for the “return to zero” on the voltmeter
- Again toggle the changer-over to the normal position (to the left)
14
PPS3
Notes regarding the OLCT 10 version for combustible gases:
- the transmitter controls an “ambiguity resolution” function: if the sensor detects a gas concentration over
100% LEL (20 mA), it will be locked on a signal of 23.2 mA acknowledgeable through power supply shut-off
or toggling of maintenance switch. The ambiguity resolution may be automatically acknowledged if the PPS3
points are short-circuited.
- Upon switching on, the output signal is set to 2mA during the 60-second stabilisation time.
4. Periodic maintenance with several OLCT 10 transmitters for
toxic gas
Use the procedure described in the previous paragraph. However:
- Start with the last transmitter in the loop in relation to the controller
- Calibrate each transmitter in the loop and end with the first
5. Sensor replacement
Sensor has to be replaced as a result of impracticable calibration or as a preventive measure.
Perform a new calibration after a sensor replacement.
6. Scrapping
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 10 has to be the object of a selective collection for
the electronic equipment and cannot be scrapped with the normal domestic waste. The user
thus has the obligation to separate the OLCT 10 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.
16
V. TECHNICAL SPECIFICATIONS
1. TECHNICAL SPECIFICATIONS - OLC 10 / OLC 10 Twin
Combustible gas detector
Detection principle: Catalytic
Range: 0-100% LEL methane, propane or butane.
Output signal: Wheatstone bridge circuit
Power supply: Current through Oldham MX controllers
Connections: OLC 10 Version:
- 3-wire terminal block, maximum distance 300 m in 1.5 mm² with
MX 15 controller
OLC 10 Twin Version (two sensors on channel input MX 15)
Dimensions: Width 118 mm, Height 157 mm, Depth 60 mm
Material: Plastic
Protection: IP65
Storage: 6 months safe from air 0°C<T<20°C +10%<RH<60%
Estimated lifetime: > 36 months
Temperature range: -10°C to + 45°C
Humidity range: 0% RH to 95% RH
Pressure range: 1 bar ± 20%
Linearity deviation: from 0 and 70% LEL: 1% LEL CH4
from 70 and 100% LEL: 7% LEL CH4
Long-term drift Zero < 10% LEL/year
under normal operating Sensitivity < 20 % of the measured value/year
conditions:
Humidity impact: ± 5 % of relative sensitivity
(10 to 90% RH) at 40°C
Response time: T50 <10 sec, T90<20 sec
Certification: Electromagnetic Compatibility EN 50270
- 1 cable gland M16: cable diameter 4 to 8 mm
- 1 3-wire terminal block to the controller
- 1 4-wire terminal block to the second sensor
- maximum total distance 300 m in 1.5 mm² with MX 15 controller
- 2 cable glands M16: cable diameter 4 to 8 mm
Explosive Atmospheres: II 3 G / Ex nA IIC T6
2. TECHNICAL SPECIFICATIONS - OLCT 10 Explo Transmitter
Combustible gas transmitter
Detection principle: Catalytic
Range: 0-100% LEL methane, propane or butane.
Signal output: 4 – 20 mA, default 0.5 mA or 23.2 mA
Ambiguity resolution: signal sets at 23.2 mA if measurement 100% LEL
Acquit by power cycling the transmitter
Ambiguity resolution may be deleted through point of programming
Settings: Local through Zero and Sensitivity potentiometers
Position Maintenance 2 mA
6-pin connector for gas measuring and current image
Power supply: 15 to 30 V dc
Consumption: maximum 100 mA
Cable length: according to the controller
Load resistance: 300 ohms
Connection: 3-wire terminal block, 2 wires for power supply, 1 wire for signal
Dimensions: Width 118 mm, Height 157 mm, Depth 60 mm
Material: Plastic
Protection: IP65
Storage: 0°C<T<30°C
Estimated lifetime: > 36 months
Temperature range: -10 to + 4°C
Humidity range: 0% RH to 95% RH
Pressure range: 1 bar ± 20%
Linearity deviation: from 0 and 70% LEL: 1% LEL CH4
Temperature drift: < 5% LEL Methane or < 20% of indication
(-10°C + 40°C)
Long-term drift under Zero point < 10% LEL methane
normal operating conditions: Sensitivity < 20% of measured value/year
Humidity impact: ± 5% of relative sensitivity
(10 to 90% RH) at 40°C
Response time: T50 <10 sec, T90<20 sec
Certification: Electromagnetic Compatibility EN 50270
(100-ohm shunt)
1 cable gland M16: cable diameter 4 to 8 mm
from 70 and 100% LEL: 7% LEL CH4
Explosive Atmospheres: II 3 G / Ex nA IIC T4
18
3. TECHNICAL SPECIFICATIONS - OLCT 10 CO Transmitter
Detection principle: Electrochemical sensor
Range: 0-300 ppm CO
Signal output: 4 – 20 mA
Settings: Local through Zero and Sensitivity potentiometers
Position Maintenance 2 mA
6-pin connector for gas measuring and current image
Power supply: 15 to 30 VDC
Consumption: maximum 30 mA
Cable length: according to the controller
Connection: 1 terminal block with 2 input wires, 1 terminal block with 2 output wires
If cable with a gas signal pair: 1 terminal block with 2 input wires
2 cable gland M16: cable diameter 4 to 8 mm
Dimensions: Width 118 mm, Height 157 mm, Depth 60 mm
Material: Plastic
Protection: IP65
Storage: 6 months safe from air 0°C<T<20°C +10%<RH<60%
Estimated lifetime: > 24 months
Temperature range: -10 to + 45°C
Humidity range: 15% RH to 90% RH
Pressure range: 1 bar ± 20%
Linearity deviation: 0 - 100 ppm ± 3 ppm
Temperature drift: < 5 ppm or < 5 % of the indication
(-10°C + 40°C)
Long-term drift under
normal operating conditions: Sensitivity: < 10% of measured value/year
Response time: T50 <15 sec, T90<30 sec
Certification: Electromagnetic Compatibility EN 50270
(100-ohm shunt)
with copy on 1 terminal with 2 wires
100 – 1,000 ppm ± 4% relative
Explosive Atmospheres: II 3 G / Ex nA IIC T4
4. TECHNICAL SPECIFICATIONS - OLCT 10 SC Transmitter
Detection principle: semi-conductor sensor
Range: 0-2000 ppm R134A, R22
Signal output: 4 – 20 mA
Settings: Local through Zero and Sensitivity potentiometers
Position Maintenance 2 mA
4-pin connector for gas measuring and current image
(100-ohm shunt)
Power supply: 15 to 30 VDC
Consumption: maximum 100 mA
Cable length: according to the controller
Connection: 3-wire terminal block, 2 wires for power supply, 1 wire for signal
1 cable gland M16: cable diameter 4 to 8 mm
Dimensions: Width 118 mm, Height 157 mm, Depth 60 mm
Material: Plastic
Protection: IP65
Storage: 6 months safe from air 0°C<T<30°C
Estimated lifetime: > 24 months
Temperature range: -10 to + 60°C
Humidity range: 20% RH to 90% RH
Pressure range: 1 bar ± 10%
Linearity deviation: 0 - 10 ppm ± 0.3 ppm
10 – 30 ppm ± 5% relative
Temperature drift: < 0.4 ppm or < 20 % of the indication
(-10°C + 40°C)
Long-term drift under
normal operating conditions: Sensitivity: < 20% of measured value/year
Response time: T50< 51s (R22)
T50 <30 sec, (R134a)
Minimum sensitivity threshold 10 ppm
Maximum sensitivity threshold 5000 ppm during 90s without sensitivity loss
Recommended Alarm Threshold 200 ppm
Minimum time to detect the lowest concentration less than 25s after injection of 500 ppm R134A
Recovery time less than 160s after injection of 8 min of 1000 ppm R134A
Certification: Electromagnetic Compatibility EN 50270
In accordance with EN 14624 certification
20
5. TECHNICAL SPECIFICATIONS - OLCT 10 NO Transmitter
Detection principle: electrochemical sensor
Range: 0-100 ppm NO
Signal output: 4 – 20 mA
Settings: local through Zero and Sensitivity potentiometers
Position Maintenance 2 mA
4-pin connector for gas measuring and current image
(100-ohm shunt)
Power supply: 15 to 30 VDC
Consumption: maximum 30 mA
Cable length: according to the controller
Connection: 1 terminal block with 2 input wires, 1 terminal with 2 output wires
If cable with other gas signal pair: 1 terminal block with 2 input wires
with copy on 1 terminal block with 2 wires
2 cable glands M16: cable diameter 4 to 8 mm
Dimensions: Width 118 mm, Height 157 mm, Depth 60 mm
Material: Plastic
Protection: IP65
Storage: 6 months safe from air 0°C<T<20°C +10%<RH<60%
Estimated lifetime: > 36 months
Temperature range: -10 to + 45°C
Humidity range: 15% RH to 90% RH
Pressure range: 1 bar ± 20%
Linearity deviation: 0 - 10 ppm ± 3 ppm
10 - 100 ppm ± 5 % relative
Temperature drift: < 10 ppm or < 10% of the indication
(-10°C + 40°C)
Long-term drift under
normal operating conditions: Sensitivity: < 20% of measured value/year
Response time: T90 < 120 sec
Certification: Electromagnetic Compatibility EN 50270
Explosive Atmospheres: II 3 G / Ex nA IIC T4
6. TECHNICAL SPECIFICATIONS - OLCT 10 NO2 Transmitter
Detection principle: electrochemical sensor
Range: 0-30 ppm NO2
Signal output: 4 – 20 mA
Settings: local through Zero and Sensitivity potentiometers
Position Maintenance 2 mA
4-pin connector for gas measuring and current image
(100-ohm shunt)
Power supply: 15 to 30 VDC
Consumption: 30 mA max
Cable length: according to the controller
Connection: 1 terminal block with 2 input wires, 1 terminal block with 2 output wires
If cable with other gas signal pair: 1 terminal block 2 input wires
with copy on 1 terminal block with 2 wires
2 cable glands M16: cable diameter 4 to 8 mm
Dimensions: Width 118 mm, Height 157 mm, Depth 60 mm
Material: Plastic
Protection: IP65
Storage: 6 months safe from air 0°C<T<20°C +10%<RH<60%
Estimated lifetime: > 24 months
Temperature range: -10 to + 50°C
Humidity range: 15% RH to 90% RH
Pressure range: 1 bar ± 20%
Linearity deviation: 0 - 10 ppm ± 0.3 ppm
10 - 30 ppm ± 5 % relative
Temperature drift: < 0.4 ppm or < 20% of indication
(-10°C + 40°C)
Long-term drift under
normal operating conditions: Sensitivity: < 20% of measured value/year
Response time: T90 < 60 sec
Certification: Electromagnetic Compatibility EN 50270
Explosive Atmospheres: II 3 G / Ex nA IIC T4
22
VI. DETAIL SPECIFICATIONS FOR USE IN EXPLOSIVE
ATMOSPHERES IN ACCORDANCE WITH THE ATEX
94/9/CE EUROPEAN DIRECTIVE
The OLC 10 sensor complies with the requirements of the ATEX 94/9/CE European Directive regarding
explosive atmospheres.
The site manager where the equipment is installed should take into consideration and comply with the
information in the following paragraphs. Refer to the provisions of the ATEX 1999/92/CE European
Directive regarding the enhancement of safety and health of the workers exposed to explosive atmosphere
risks.
1. Specifications for installation in ATEX Zone 2G
The installation will be performed in accordance with existing standards, in particular EN 60079-14 and EN
60079-17 standards.
The detectors are designed for surface industries Group II, Category (3) G zone 2 for minimum and maximum
ambient temperatures from –25°C to + 60°C. They should not be exposed to mechanical vibrations.
The detectors are installed vertically (wall-mounted type) with the cable output downwards. An angle of over
45° from the vertical or a horizontal position (ceiling-mounted type) will result in measurement errors and will require a
recalibration of the detector.
2. Metrological specifications for OLC 10 combustible gas
detector
The OLC 10 combustible gas detector is compliant with the European standards EN 61779-1 and -4 for
methane (calibration gas), butane, propane and hydrogen (gas following response curves), when they are used with SV
4B, MX 15, MX 32, MX 42A, MX 43, MX 48, MX 52 OLDHAM controllers.
Note: the vibration tests based on EN 61779-4 paragraph 4.13 have not been conducted because they do not apply due
to the operating conditions of this type of detector.
2.1. Special precautions
Sensors are sensitive to some poisons that may cause their desensitisation: emanation of siliconized vapours
with concentrations > 10 ppm, chlorinated species or sulphur with concentrations > 100 ppm
The lack of oxygen (< 15% O2) or over-oxygenation (> 23% O2) may cause an underestimation or
overestimation of the measurement.
2.2. Reactions to other combustible gases
It is recommended to calibrate the detector with the gas to be measured. When the user wishes to calibrate it with
another gas than that detected and factory programmed, refer to the table below, using the recommended gas and
corresponding coefficient.
Empirical
formula
LEL
LSE
Vapour
density
Coefficient
CH4
Coefficient
H2
Coefficient
But
Butane
C4H10
1.5%
8.5 % 2 1.75
1.25
1.0
Hydrogen
H2
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
Propane
C3H8
2.0%
9.5
1.6
1.5
1.1
0.85
Gas recommended for the calibration.
Table 1: COEFFICIENTS FOR CALIBRATION
Example (first line in the table): calibration of a “Acetone” detector with a calibration gas of 1% butane volume
Value to be displayed: 1% (injected butane) x 100 x 0.95 (butane/acetone coefficient) = 63% LEL
1.5% (LEL butane)
Note:
- LEL varies based on sources. Those reported here are required by European standard EN 50054.
- The coefficients are accurate at 15%
3. MARKING
3.1. Version OLC 10 / OLC 10 Twin
OLDHAM Arras
OLC 10 / OLC 10 TWIN
II 3G
Ex nA IIC T6
OSA 05ATEX0116
Caution: electrostatic loads. Rub or wipe with a damp cloth only.
Serial number, year of fabrication.
3.2. Version OLCT 10
OLDHAM Arras
OLCT 10
II 3G
Ex nA IIC T4
OSA 05ATEX0116
Caution: electrostatic loads. Rub or wipe with a damp cloth only.
Serial number, year of fabrication.
24
VII. DECLARATIONS OF CONF ORMITY
26
The Fixed Gas Detection Experts
EUROPEAN PLANT AND OFFICES
Z.I. Est – rue Orfila CS 20417 – 62027 Arras Cedex FRANCE
Tél: +33 (0)3 21 60 80 80 – Fax: +33 (0)3 21 60 80 00
Website: http://www.oldhamgas.com
AMERICAS
Tel: +1-713-559-9280
Fax: +1-281-292-2860
americas@oldhamgas.com
ASIA PACIFIC
Tel: +86-21-3127-6373
Fax: +86-21-3127-6365
sales@oldhamgas.com
EUROPE
Tel: +33-321-608-080
Fax: +33-321-608-000
info@oldhamgas.com
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