Gonnheimer Elektronic F870S, User Manual

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F870S 2 Pressurized enclosure system F870S Page 8
Gönnheimer Elektronic GmbH Tel.: +49 (6321) 49919-0 Fax: +49 (6321) 49919-41
2.3.3 Lowered cabinet stressing due to smaller pressure and pressure gradients
During the purging phase a high flow rate should be achieved to shorten the purge time.
Based on their construction, conventional Ex p- systems show only a smooth rising of the
flow rate while increasing the cabinet pressure.
In this aspect, the FS870S with its reduced flow restriction and back pressure is superior to
any conventional Ex p system.
Within midrange flow rates, the load to the Ex p- cabinet walls is up to four times lower in
comparison to conventional systems!
2.4 Components of pressurized enclosure system F870S
The pressurized enclosure system F870S contains at least the control unit FS870S and a
solenoid valve. Each can be mounted in- or outside the enclosure. Furthermore several re-
mote controls (operation panels) are available to improve ease of operation. It is also pos-
sible to connect intrinsically safe sensors to the control unit FS870S.
The pressurized enclosure system F870S has
two basic operation modes
:
•
Pressurization using
leakage compensation
•
Pressurization using
continuous flow
of protective gas.