Artidor AR-081 Mode D'emploi page 7

Function
B "Breather"
C "Drain"
Note
Explosion pressures taken into account on Ex d enclosures are based on atmospheric
conditions. Therefore European and International standards do not allow flameproof type 'd'
enclosures to be exposed to housing conditions higher than 110% of atmospheric pressure.
It is therefore important that manufacturers of completed products include measures for
cases where pressures higher than atmospheric pressure could occur in the free volume of
the housing. This could occur especially with products such as Ex d gas analyzing
equipment, because of leakage of the pipe lines must be taken into account.
A possible solution to this would be to attach an additional flameproof Ex d "breather" to the
flameproof housing, with at least the same flow rating as that of the inlet. The ARTIDOR
bulkhead fitting AR-081 also provides the ideal solution to this problem!
Extremely low resistance to flow
The flameproof bulkhead fitting AR-081 has a characteristically low resistance to flow, which
means that a drop in pressure is kept to an absolute minimum. The values are expressed in
the diagram below.
Installation manual AR-081 bulkhead fitting
Picture Explanation
Creating an open connection
between the inside of an 'Ex d'
enclosure and the outside
atmosphere e.g. to prevent
pressure raise inside the
enclosure involved.
For draining condensation
water from an 'Ex d' enclosure.
E
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