Preparation for Installation 39
Explosion-proof Design in Degree of Protection II 3G
NOTE
The version for the measurement of flammable gases and vapors and the
explosion-proof version with degree of protection II 3G are different
versions of the gas analyzer and designed for different applications.
Description
The gas analyzer model EL3040 in degree of protection II 3G has been
tested for explosion protection and is suitable for use in hazardous areas
in compliance with the technical data (see page 17) and the special
con
ditions (see below).
It may be used for the measurement of non-flammable gases and vapors
and is designated pursuant to European Directive 94/9/EC with:
II 3G Ex nA nC IIC T4 Gc X
Operating the instrument under regular conditions cannot cause any
ignitable sparks, arcs or impermissible temperatures inside the
instrument.
Explosion-proof with: Spark-free instruments and devices with low power
consumption; sealed or enclosed instruments.
Evaluation based on EN 60079-15:2010 "Explosive atmospheres –
Part 15: Equipment protection by type of protection 'n'".
Special Requirements
The cables have to be properly inserted in the screwed cable glands
and sealed by screwing the nut firmly in order to comply with degree
of case protection IP65. Cable connectors not in use have to be
closed with suitable vent plugs in order to ensure degree of case
protection IP65 here as well.
If the installation site of the gas analyzer is hazardous, the case must
not be opened live.
Purging gas connections not in use during operation have to be
closed with vent plugs.
Due to the high surface resistance of the keyboard overlay
(R > 1 Gigaohm) the gas analyzer has to be operated and maintained
in such a way that the risk of a hazardous electrical discharge is ruled
out (e.g. using only suitable cloth for cleaning).
Due to the low mechanical stability of the display window, the gas
analyzer has to be installed and operated in such a way that
mechanical damage to the display window is ruled out. In the event
that the display window is still damaged making it impossible to
comply with degree of case protection IP65, the gas analyzer has to
be shut down, secured against re-starts and it has to be repaired.
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