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The OLC/OLCT 20 & 40 detection devices comply with the requirements of European
Directive ATEX 94/9/EC on potentially explosive atmospheres.
As a result of its metrological performance, as tested by the research and testing organisation
INERIS, the OLC/OLCT 20 & 40 devices, designed to measure explosive gasses and oxygen, are
classified as a safety devices and may therefore contribute to limiting the risk of explosion.
The information contained in the following paragraphs should be adopted and complied with
by the person responsible for the site on which 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.
1. Specifications for mechanical and electrical installation in Classified Areas.
Installation will comply with all applicable standards, and particularly with EN 60079-14,
EN 60079-17 and EN 50281-1-2.
1.1. Explosion-proof detectors (d): OLC/OLCT 20 d and enlarged safety (e) and
explosion-proof (d) : OLC/OLCT40 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 -25°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 cell 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.
1.2. Explosion-proof detector (d) version HT High Temperature
- The OLC20 d HT cell block is intended for use in surface industries II, Category 2,
zones 1 and 2 (Gas) in ambient temperature ranges that vary according to the
temperature classes applying to the zone concerned:
- Temperature class T4: Ambient temperatures from –25°C to +110°C
- Temperature class T3: Ambient temperatures from –25°C to +180°C
- Temperature class T2: Ambient temperatures from –25°C to +200°C
- The cable will be mechanically protected.
- The transmitter casing will be earthed using the external terminal, which should be
corrosion-protected.
- Where connections are located in a classified zone, they will be enclosed in approved
envelopes.
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