INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA
9610™
20 | Page
1.7 Z-Purge Option
1.7.1 Purpose
The COSA 9610™ Calorimeter is protected by a Pepperl & Fuchs’ Bebco EPS system type Z
rapid exchange purging system, model 1002. It allows the use of general purpose or
nonrated non-rated electrical or electronic devices, with exception to devices that produce
excessive heat, utilize combustible gas, or expose arcing contacts to the hazardous
atmosphere, in NEMA (National Electrical Manufacturers Association) 4 or 12 enclosures in
the place of explosion proof NEMA 7 enclosures. Other purposes include heat, moisture and
dust contamination prevention.
The purge Type Z pressurization system protects general-purpose equipment mounted in a
standard enclosure so that it can be located and operated in a hazardous area. The
hazardous area classification can be Class I, Division 2, Group B, C, D. The Z-purge operates
by controlling and monitoring compressed instrument air through the protected enclosure(s)
to remove and prevent the accumulation of flammable gas, vapors, or dust.
The Z-Purge system features these main parts:
•
Enclosure pressure gauge
•
Enclosure pressure control valve
•
Rapid exchange control valve
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