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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