6500 Series Purge and Pressurization System
I/O Manual
6
2 The 6500 purge and pressurization system – general explanation
of the system
The Pepperl+Fuchs 6500 purge and pressurization controller allows for general purpose equipment to
operate in a Zone 1/21 hazardous area to achieve an Ex px rating, or Zone 2/22 rated equipment mounted
in an enclosure in a Zone 1/21 hazardous area to achieve an Ex py rating. The 6500 control unit and EPV-
6500 vent is certified for Ex px or Ex py applications.
2.1 Standard vs. dilution applications
The 6500 purge and pressurization system can be set up for standard or dilution applications. Standard
applications are pressurizing enclosures that have equipment within the pressurized enclosure that does
not contain any hazardous gas.
Dilution applications are enclosure systems that do not have a containment system within the enclosure.
Containment systems in this context are usually used in analyzer applications where a small stream of
hazardous gas enters the pressurized enclosure and is analyzed for its content. This containment, (within
the pressurized enclosure), is the piping, enclosure, and any other device that can hold the hazardous gas,
which has the potential to leak within the enclosure. Depending on the leakage rate and if it is normal or
abnormal potential will demand the type of purging required and the equipment needed.
Note!
If the leakage rate cannot be determined or it is unlimited, then inert gas is required and dilution cannot be
used.
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