30
6000 Series Purge/Pressurization System
I/O Manual
Dust and gas hazardous location
• Enclosure must be cleaned of all combustible dust.
• Enclosure is sealed.
• Pressure is set to a value above a minimum of
0.65" wc [(16.5 mm wc), (1.6 mbar), (162 Pa)],
or the set value from the user input.
• Depending on how the purging mode is selected,
purging the enclosure is required.
• After a successful purging, with the pressure in
the enclosure above 0.65" wc [(16.5 mm wc),
(1.6 mbar), (162 Pascal)], the enclosure is
considered safe, and power to the enclosure can
be energized.
• If the safe pressure drops below 0.65" wc
[(16.5 mm wc), (1.6 mbar), (162 Pa)], the power
to the enclosure will be disconnected, unless a
time delay for shutting off power is implemented
(see the requirements for time delay of power
shut-off).
• To energize the enclosure again, repeat the
procedure.
The combination of dust and gas requires the cleaning
and sealing of the enclosure to clear out the dust
hazard(s) and purging the enclosure to clear out the gas
hazard(s). After these sequences, the enclosure can be
energized. However, the pressure during operation must
be sufficient to keep out the worst case hazard in the
atmosphere/environment. In this application, dust.
Refer to "Conditions of Safe Use"
EN60079-2 and IEC 60079-2 do not cover both
gas and dust hazardous atmospheres. The
6000 system provides a solution for both at the
same time but would have to be evaluated by the
certication bodies for approval.
Start-up label located on 6000 series control
unit
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