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1.3. Intrinsic safety detectors (i) OLCT20 i and OLCT40 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 coal mines II, Category
M1. The ambient operating temperature range is –25°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. Please refer to EN 50039 for group II when drafting this
document.
- 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 OLCT20i and OLCT40i detectors are :
Ui (V) Ii (mA) Pi (mW) Ci (nF) Li (H)
28 94 658 40 15µH
2. Metrological specifications for explosive gas and oxygen measurement
detectors
The OLC/OLCT 20 & 40 transmitter sensors intended to measure explosive gasses and
oxygen are classified as safety devices and may therefore contribute to limiting the risk of
explosion. N.B.: the OLC20 d High Temperature detector does not fall within this category.
Detectors comply with the following European standards:
Explosive gas detectors:
- OLC20 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 ISC/OLDHAM detection devices SV4B, MX32,
MX42A, MX48 and MX52.
- OLCT20 and OLCT40 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 ISC/OLDHAM detection devices
SV4B, MX32, MX42A, MX48 and MX52, 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:
- OLCT20 and OLCT40 oxygen detectors comply with European Standard EN 50104
where they are used with ISC/OLDHAM detection devices MX32, MX42A, MX48 and
MX52, 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).
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