Page 1
USER MANUAL
OLC/OLCT 20
Part Number: NPO20GB
Revision: D.0
Gas Detector
The Fixed Gas Detection Experts
Page 2
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.
EEXXTTEENNTT OOFF RREESSPPOONNSSIIBBIILLIITTYY
* 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.
CCLLAAUUSSEESS CCOONNCCEERRNNIINNGG PPRROOPPEERRTTYY
* 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.
WWAARRNNIINNGGSS
* 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.
GGUUAARRAANNTTEEEE
2 years guarantee in normal conditions of use on parts and technical labour, return in our workshops, excluding
consumables (sensors, filters, etc.)
Page 3
3
CONTENTS
1 Description ................................................................................................... 5
1.1 General .......................................................................................................................... 5
1.2 Main characteristics of the various versions ................................................................. 5
1.3 Mechanical installation of the various versions ............................................................ 6
2 Wiring arrangements .................................................................................. 7
2.1 3-Wire version (OLC 20d, OLCT 20d) ........................................................................ 7
2.2 2-wire versions (OLCT 20d) ......................................................................................... 7
2.3 2-wire Intrinsic Safety versions (OLCT 20i) ................................................................ 8
3 Maintenance ................................................................................................. 9
3.1 Detector OLC 20 ........................................................................................................... 9
3.1.1 Calibration ............................................................................................................... 9
3.1.2 Replacing a sensor on an OLC 20 ......................................................................... 10
3.2 Transmitters OLCT 20 ................................................................................................ 10
3.2.1 Calibration ............................................................................................................. 10
3.2.2 Calibration specifications ...................................................................................... 12
3.3 Replacing a sensor on OLCT 20 ................................................................................. 12
3.4 Disposal of OLC(T) 20 ............................................................................................... 12
4 Spare Parts ................................................................................................. 13
4.1 OLC 20 flameproof gas detector ................................................................................ 13
4.2 OLCT 20 flameproof gas detector .............................................................................. 13
4.3 OLCT 20 Intrinsic Safety detector .............................................................................. 14
5 Accessories ................................................................................................. 15
6 Technical characteristics of OLC 20 ....................................................... 17
7 Technical characteristics of OLCT 20..................................................... 17
8 Specific Instructions for use in Explosive Atmospheres according to
European Directive ATEX 94/9/EC ........................................................ 19
8.1 Specifications for mechanical and electrical installation in Classified Areas. ........... 19
8.1.1 Flameproof detectors (d) ....................................................................................... 19
8.1.2 Intrinsic safety detectors (i) OLCT 20 i ................................................................ 19
Page 4
4
8.2 Metrological specifications for explosive gas and oxygen measurement detectors ... 20
8.2.1 Technical Specifications and Special Instructions for explosive gas detectors .... 21
8.2.2 Technical Specifications and Special Instructions for Oxygen detectors ............. 25
8.3 Markings ..................................................................................................................... 26
8.3.1 Flameproof certified version: OLC 20d and OLCT 20 d ...................................... 26
8.3.2 Intrinsic safety version: OLCT 20 i ...................................................................... 26
9 Recommendations ..................................................................................... 27
10 EU Declaration of Conformity ................................................................. 29
Page 5
5
1 Description
1.1 General
OLC 20 gas detectors are catalytic type detectors intended for the detection of combustible
gases. They are flameproof certified (OLC 20d).
OLCT 20 gas detectors are 4-20 mA transmitters and are intended for the measurement of
combustible and toxic gases and oxygen. They are either flameproof certified (OLCT 20d)
or intrinsically safe certified (OLCT 20i).
OLC 20s and OLCT 20s are available in ¾ NPT or M25 screw fittings and are designed to
be attached on a junction box or any compatible generic transmitters.
1.2 Main characteristics of the various versions
OLC 20
OLCT 20
LEL
LEL
TOX/O2
Flameproof design
X X X
Intrinsic safety design
X
3-wire cable / Wheatstone bridge
X
3-wire cable / 4-20 mA output
X
2-wire cable / 4-20 mA output
X
Catalytic sensor
X X
Electrochemical sensor
X
Replaceable sensor
X
Replaceable and pre-calibrated sensor
X X
Page 6
6
1.3 Mechanical installation of the various versions
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.
Figure 1 : Dimensions
A Dimensions OLC/OLCT 20
Cable length 0.2 m
A
Page 7
7
C
3
1
3 (+)
1 (-/S)
E
C
B
A
D
1
2
3
1 (S)
2 (-)
3 (+)
B
E D D
A
2 Wiring arrangements
Please ensure you read the paragraph: Special Specifications for use in Potentially Explosive
Atmospheres in Accordance with European Directive ATEX 94/9/EC
2.1 3-Wire version (OLC 20d, OLCT 20d)
Figure 2
A
B C D
E
OLDHAM controller
OLC or OLCT 20
Grounding
Power supply
Signal (I)
2.2 2-wire versions (OLCT 20d)
Figure 3
A
B C D
E
OLDHAM controller
OLC 20 or OLCT 20
Grounding
Power supply
Power supply
Signal
Page 8
8
Hazardous area
Safe area
C
B
A
2.3 2-wire Intrinsic Safety versions (OLCT 20i)
Figure 4
A B C
OLDHAM controller
OLC 20 or OLCT 20
ZENER Barrier
Page 9
9
3 Maintenance
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.
It is prohibited to open the transmitter when energized
3.1 Detector OLC 20
Gas detection instruments are potential life-saving devices. Recognizing this fact, OLDHAM 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.
OLDHAM 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. OLDHAM 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.
3.1.1 Calibration
On the controller
On the detector
Set the measuring channel to the calibration
position (alarm relays inhibited)
Proceed the zero and span
Set the measuring channel back to the
"normal" position and make sure that it is
working properly.
Apply the calibration cup and perform the
calibration in accordance with the procedure
defined during the training course provided
by OLDHAM or by an OLDHAM’s
authorized person
Page 10
10
3.1.2 Replacing a sensor on an OLC 20
When?
- When the sensor is damaged or cannot be calibrated
- On a preventive basis
How?
- Turn off the relevant measuring channel
- Remove the sensor to be replaced
- Replace it with a new sensor
- Turn on the channel back and check that it operates correctly
(see the following page for more information)
3.2 Transmitters OLCT 20
OLCT 20 gas transmitters are equipped with a pre-calibrated sensor and do not require any
adjustment on installation.
However, as gas detectors are safety equipment, it is recommended to bump test the complete
transmitter after a sensor replacement.
3.2.1 Calibration
After removing the sensor from the transmitter, perform the calibration by using the calibrating
bench provided for that purpose (see CALIBRO’s user manual).
Page 11
11
Procedure
On the controller
On the detector
Set the measuring channel to the calibration
position (alarm relays inhibited)
Set the measuring channel back to the
"normal" position and make sure that it is
working properly.
Rotate the sensor
module then
extract it
1
2
Once calibrated put the sensor back in place or
use a replacement sensor and reinstall the whole
assembly.
Loosen the
locking screw
Page 12
12
3.2.2 Calibration specifications
Calibration shall be performed outside classified areas and by using suitable
equipment that is described during the training course provided by OLDHAM
or by a person authorized by OLDHAM.
OLCT 20 sensor module
(LEL/TOX/O2)
3.3 Replacing a sensor on OLCT 20
When?
- When the sensor is damaged or cannot be calibrated.
- On a preventive basis.
How?
- Switch off the relevant measuring channel.
- Remove the sensor to be replaced.
- Replace it with a new, precalibrated unit.
- Switch the channel back on and check that it operates correctly.
3.4 Disposal of OLC(T) 20
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 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 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
Page 13
13
4 Spare Parts
Use only genuine spares, otherwise the reliability of the equipment could be adversely
affected
4.1 OLC 20 flameproof gas detector
Flameproof replacement sensors
Part number
Replacement sensor (VQ1 – standard)
6313757
Replacement sensor (AP – poison resistant)
6313758
Catharometric sensor
6313759
4.2 OLCT 20 flameproof gas detector
Flameproof replacement sensors
Part number
OLCT 20, 0-100% LEL (VQ1)
OLCT 20, 0-100% LEL (AP)
OLCT 20, 0-100% vol. (catharometer)
OLCT 20 CO, 0 – 100 ppm
OLCT 20 CO, 0 – 300 ppm
OLCT 20 CO, 0 - 1000 ppm
OLCT 20 H2S, 0 – 30 ppm
OLCT 20 H2S, 0 – 100 ppm
OLCT 20 H2S, 0 - 1000 ppm
OLCT 20 NO, 0 – 100 ppm
OLCT 20 NO, 0 – 300 ppm
OLCT 20 NO, 0 - 1000 ppm
OLCT 20 H2, 0 - 2000 ppm
OLCT 20 NH3, 0 – 100 ppm
OLCT 20 NH3, 0 - 1000 ppm
OLCT 20 O2, 0 - 0–30% vol.
6313685
6313974
6313687
6313690
6313691
6313692
6313695
6313696
6313697
6313698
6313699
6313700
6313706
6313707
6313708
6313710
Page 14
14
4.3 OLCT 20 Intrinsic Safety detector
INTRINSIC SAFETY SENSORS (SI)
Part number
OLCT 20 CO, 0 – 100 ppm
OLCT 20 CO, 0 – 300 ppm
OLCT 20 CO, 0 - 1000 ppm
OLCT 20 H2S, 0 – 30 ppm
OLCT 20 H2S, 0 – 100 ppm
OLCT 20 H2S, 0 - 1000 ppm
OLCT 20 NO, 0 – 100 ppm
OLCT 20 NO, 0 – 300 ppm
OLCT 20 NO, 0 - 1000 ppm
OLCT 20 NO2, 0 – 10 ppm
OLCT 20 NO2, 0 – 30 ppm
OLCT 20 SO2, 0 – 10 ppm
OLCT 20 SO2, 0 – 30 ppm
OLCT 20 SO2, 0 - 100 ppm
OLCT 20 H2, 0 – 2000 ppm
OLCT 20 NH3, 0 – 100 ppm
OLCT 20 NH3, 0 - 1000 ppm
OLCT 20 HCl, 0 – 30 ppm
OLCT 20 HCl, 0 - 100 ppm
OLCT 20 HCN, 0 – 30 ppm
OLCT 20 HCN, 0 - 100 ppm
OLCT 20 Cl2, 0 – 10 ppm
OLCT 20 O3, 0 – 1 ppm
OLCT 20 COCl2, 0 – 1 ppm
OLCT 20 PH3, 0 – 1 ppm
OLCT 20 AsH3, 0 – 1 ppm
OLCT 20 HF, 0 – 10 ppm
OLCT 20 ClO2, 0 – 3 ppm
OLCT 20 ETO, 0 – 30 ppm
OLCT 20 SiH4, 0 – 50 ppm
OLCT 20 O2, 0 – 30% vol.
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
Page 15
15
5 Accessories
TOOL KIT
6147869
CALIBRATION CUP
6331141
BY-PASS ADAPTOR
for combustible gases, CO, H2S, O2
6327910
PLASH GUARD
6329004
PROTECTIVE FILTER, PTFE
6335975
ACTIVE CARBON FILTER
6335976
REMOTE CALIBRATION CUP
(for combustible gases only)
6327911
Page 16
16
Page 17
17
6 Technical characteristics of OLC 20
Power supply: voltage on detector terminals = 2.8 V max
Power consumption: 3-wire version = 400 mA max
Measurement signal: Wheatstone bridge
Line length (shielded cable): 3-wire version = 1 km as 3x 1.5 mm2
(32 ohms in loop mode)
Output signal mV bridge output, 3 wires
Ingress Protection IP66
Weight 800 g
Dimensions 60 X 120 mm
7 Technical characteristics of OLCT 20
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)
Output signal
Source mode current 4-20 mA
Max. current 25 mA
Fault current <1 mA
Miscellaneous
Ingress Protection IP66
Weight 800 g
Dimensions 60 X 120 mm
Page 18
18
Page 19
19
8 Specific Instructions for use in Explosive Atmospheres
according to European Directive ATEX 94/9/EC
The OLC/OLCT 20 gas detectors comply with the requirements of European Directive ATEX
94/9/EC relating to explosive Dust and Gas atmospheres.
As a result of their metrological performance, as tested by the Approval Agency INERIS, the
OLC/OLCT 20 gas detectors designed to measure explosive gasses and oxygen are classified as
safety devices and may therefore contribute to limiting the risk of explosion.
The information contained in the following paragraphs should be respected and taken into
account by the manager of the site where 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.
8.1 Specifications for mechanical and electrical installation in Classified Areas.
Installation will comply with all applicable standards, and particularly with EN 60079-14 and
EN 60079-17.
8.1.1 Flameproof detectors (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 -20°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 sensor points downwards.
Any variance of over 45° from the vertical will result in measurement errors.
- Where connections are located in a classified zone, they will be enclosed in approved
envelopes.
- The width of the threaded joint of cable gland is superior to the value specified in the table
of EN 60079-1 standard.
8.1.2 Intrinsic safety detectors (i) OLCT 20 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 use in coal mines,
Category M1. The ambient operating temperature range is –20°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.
- 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 OLCT 20i detectors are :
Ui (V)
Ii (mA)
Pi (mW)
Ci (nF)
Li (H)
28
94
658
40
15μH
Page 20
20
8.2 Metrological specifications for explosive gas and oxygen measurement
detectors
In case of exposure above the measuring range, it is mandatory to bump test
the instrument with gas and/or to perform a calibration.
In the event of a change of position, it is necessary to re-calibrate the detector.
The OLC/OLCT 20 transmitter sensors intended to measure explosive gasses and oxygen are
classified as safety devices and may therefore contribute to limiting the risk of explosion.
Detectors comply with the following European standards:
Explosive gas detectors:
- OLC 20 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 the following OLDHAM controllers SV 4B, MX 15,
MX 32, MX 42A, MX 43, MX 48 and MX 52.
- OLCT 20 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 SV 4B, MX 15, MX 32, MX 42A, MX 43, MX 48, MX
52 and MX 62 OLDHAM controllers, 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:
- OLCT 20 oxygen detectors comply with European Standard EN 50104 where they are
used with MX 15, MX 32, MX 42A, MX 43, MX 48, MX 52 and MX 62 OLDHAM
controllers, 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).
Page 21
21
8.2.1 Technical Specifications and Special Instructions for explosive gas detectors
8.2.1.1 Transfer curves for OLCT 20 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 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.
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.
0 %
100 % 120%
20.0 mA
4.0 mA
1 mA
Concentration
in % LEL
Output Current in
mA
Fault
23.2 mA
Fault
Page 22
22
8.2.1.2 Metrological data
Type
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
-20°C to +55°C
Humidity range
0% RH to 95% RH
Pressure range
1 bar ± 10%
Linearity variance (methane scale)
Between 0% and 70% LEL: 1% LEL
Between 70% and 100% LEL: 7% LEL
Measurement reproducibility
± 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
40°C
± 5% of relative sensitivity
Maximum recommended interval between
calibrations (normal operating conditions)
6 months
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
Page 23
23
8.2.1.3 Special precautions for explosive gas detectors
Sensors 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).
Sensors must be located head downwards at installation or during maintenance work.
8.2.1.4 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
Chemical
Formula
LEL
(%)
LSE
(%)
Flash
point
(°C)
Vapor
density
Coefficient
-
Calibration gas
CH4 (methane)
Coefficient
Calibration gas
H2 (Hydrogen)
Coefficient
- Calibration gas
C4H10 (Butane)
Coefficient
- Calibration gas
C5H12
(Pentane)
Ethyl acetate
C4H8O2
2,10
11,50
-4
3,0
1,65
1,35
0,90
0,80
Acetone
C3H6O
2,15
13,00
-18
2,1
1,65
1,35
0,90
0,80
Acetylene
C2H2
1,50
100
-18
0,9
2,35
1,90
1,25
1,15
Acrylic acid
C3H4O2
2,40
8,00
54
2,5
5,00
4,00
2,65
2,40
Butyl acrylate
C7H12O2
1,20
8,00
37
4,4
3,50
2,80
1,85
1,70
Ethyl acrylate
C5H8O2
1,70
13,00
-2
3,5
3,05
2,45
1,65
1,50
Acrylonitrile
C3H3N
2,80
28,00
-1
1,8
1,45
1,20
0,80
0,70
Ammoniac
NH3
15,00
30,20
< -100
0,6
0,90
0,75
0,50
0,45
Benzene
C6H6
1,20
8,00
-11
2,7
4,00
3,20
2,15
1,90
1.3Butadiene
C4H6
1,40
16,30
-85
1,9
2,55
2,05
1,35
1,25
Butane
C4H10
1,50
8,50
-60
2,0
1,90
1,55
1,00
0,90
Butanol
(Butyl Alcool)
C4H10O
1,4
11,3
29
2,6
1,95
1,60
1,05
0,95
2 - Butanone
(MEK)
C4H8O
1,80
11,50
-4
2,5
3,90
3,15
2,10
1,90
Cyclohexane
C6H12
1,20
8,30
-17
2,9
2,00
1,60
1,10
1,00
Dimethylether
C2H6O
3,00
27,00
-41
1,6
1,80
1,45
0,95
0,90
Dodecane
C12H26
0,60
~6,0
74
5,9
4,00
3,20
2,15
1,90
Ethane
C2H6
3,00
15,50
135
1,0
1,50
1,20
0,80
0,75
Ethanol
C2H6O
3,30
19,00
13
1,6
2,15
1,75
1,15
1,05
Ether
(Diethylether)
(C2H5)2O
1,70
36,00
-45
2,6
1,90
1,55
1,00
0,90
Ethylene
C2H4
2,70
34,00
- 135
1,0
1,65
1,35
0,90
0,80
LPG
Prop+But
1,65
~9,0
< -50
1,9
1,90
1,55
1,00
0,90
Diesel
Melange
0,60
~6,0
55
> 4
3,20
2,60
1,70
1,55
Natural Gas
CH4
5,00
15,00
-188
0,6
1,05
Heptane
C7H16
1,10
6,70
-4
3,5
2,20
1,80
1,20
1,05
Page 24
24
Gas
Chemical
Formula
LEL
(%)
LSE
(%)
Flash
point
(°C)
Vapor
density
Coefficient
-
Calibration gas
CH4 (methane)
Coefficient
Calibration gas
H2 (Hydrogen)
Coefficient
- Calibration gas
C4H10 (Butane)
Coefficient
- Calibration gas
C5H12
(Pentane)
Hexane
C6H14
1,20
7,40
-23
3,0
2,10
1,70
1,15
1,00
Hydrogen
H2
4,00
75,60 - 0,069 1,00
Isobutane
C4H10
1,50
8,40
-83
2,0
1,50
1,20
0,80
0,75
Isobutene
C4H8
1,60
10,00
<-10
1,9
2,20
1,80
1,20
1,05
Isopropanol
C3H8O
2,15
13,50
11,7
2,1
1,60
1,30
0,85
0,80
Kerosene
(JP4)
C10 -
C16
0,70
5,00
> 50
> 4
5,00
4,00
2,65
2,40
Methyl
Methacrylate
C5H8O2
2,10
12,50 2 3,5
2,25
1,80
1,20
1,10
Methane
CH4
5,00
15,00
-188
0,55
1,00
Methanol
CH3OH
5,50
44,00
11
1,1
1,40
1,15
0,75
0,70
Naphta
melange
(Mixture)
0,90
5,90
> 44
> 4
3,50
2,80
1,85
1,70
Nonane
C9H20
0,70
5,60
31
4,4
4,40
3,55
2,35
2,10
Octane
C8H18
1,00
6,00
12
3,9
2,70
2,20
1,45
1,30
Ethylene
Oxyde
C2H4O
2,60
100
-20
1,5
2,10
1,70
1,15
1,00
Propylene
oxide
C3H6O
1,90
37,00
70
2,0
2,35
1,90
1,25
1,15
Pentane
C5H12
1,40
8,00
-49
2,5 1,00
Propane
C3H8
2,00
9,5
-104
1,6
1,55
1,25
0,85
0,75
Propylene
C3H6
2,00
11,70
-107,8
1,5
1,65
1,35
0,90
0,80
Styrene
C8H8
1,1
8,00
31
3,6
6,30
5,05
3,35
3,00
Gasoline lead
free
/
1,10
~6,0
21
3 à 4
1,80
1,45
0,95
0,90
Toluene
C7H8
1,20 7 5
3,1
4,00
3,20
2,15
1,90
Turpentine
Oil
-
0,8
6,0
35
4,7
3,50
2,80
1,85
1,70
Triethyl
amine
C6H15N
1,20 8 -15
3,5
2,05
1,65
1,10
1,00
White Spirit
melange
(Mixture)
1,10
6,50
>30
> 4
3,50
2,80
1,85
1,70
Xylene
C8H10
1,00
7,60
25
3,7
4,00
3,20
2,15
1,90
Sensors with a grey background: gases recommended for calibrating the detector (VQ1)
Example (second 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 0.90 (Butane/Acetone coefficient) = 60% LEL
1.5% (butane LEL)
N.B.:
- LELs vary depending on the source. Those values shown here are taken from European
Standard EN 50054
- Coefficients are accurate to 15%
Page 25
25
8.2.2 Technical Specifications and Special Instructions for Oxygen detectors
8.2.2.1 Transfer curves for OLCT 20 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 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.
8.2.2.2 Metrological data
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 temperature (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
power-up
30 to 60 minutes
0 %
30.0 % 36.0%
20.0 mA
4.0 mA
1 mA
% O2 concentration
by volume
Output Current in mA
Fault
23.2 mA
Fault
Page 26
26
8.2.2.3 Characteristics and Special precautions for oxygen detectors
When the transmitter is powered up or the measurement sensor 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.
8.3 Markings
8.3.1 Flameproof certified version: OLC 20d and OLCT 20 d
OLDHAM
F – 62027 Arras
0080
OLC 20d or OLCT 20d
II 2GD
Ex d IIC T6 Gb
Ex tb IIIC T85°C Db IP66
Tamb : -20°C to 70°C
INERIS 01ATEX0004X
Read instruction manual
WARNING: Do not open when energized
Serial number, year of manufacture
8.3.2 Intrinsic safety version: OLCT 20 i
OLDHAM
F – 62027 Arras
0080
OLCT 20i
II 1 GD
Ex ia IIC T4 Ga
Ex ia IIIC T135°C Da IP66
I M1 Ex ia I Ma
Tamb : -20°C to 70°C
INERIS 01ATEX0004X
Read instruction manual
WARNING: Do not open when energized
Serial number, year of manufacture
Page 27
27
9 Recommendations
The measuring sensor shall be 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 sensor).
The TRANSMITTER must also be positioned so as to allow access to the measuring sensor 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
Page 28
28
Page 29
29
10 EU Declaration of Conformity
Page 30
30
Page 31
31
Page 32
Thank you for reading this data sheet.
For pricing or for further information, please contact us at our UK Office, using the details
below.
UK Office
Keison Products,
P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England.
Tel: +44 (0)330 088 0560
Fax: +44 (0)1245 808399
Email: sales@keison.co.uk
Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the
suitability of this product.
Loading...