6500 Series Purge and Pressurization System
I/O Manual
43
PRESSURES – User-defined.
Selection:
MAX OVERPRESSURE: The maximum enclosure pressure allowed. If max pressure is reached, the
alarm status is on and the DV (digital valve output) will shut off and the PV (proportional valve) will
reduce flow until pressure is below the max pressure set-point. Range is from 0.88 mbar
(0.35” wc) to 25 mbar (10” wc).
LOW PRESSURE: Usually set above the Min Overpressure but above the set-point pressure and
acts as an alarm. Range is from 0.88 mbar (0.35” wc) to 25 mbar (10” wc).
MIN OVERPRESSURE: The minimum pressure the system can operate properly. Range is from 0.88
mbar (0.35” wc) to 25 mbar (10” wc).
Default: MAX = 10 mbar (4” wc), LOW = 0.88 mbar (0.35” wc), MIN = 0.88 mbar (0.35” wc)
TIMERS – User-defined
Selection:
SHUTDOWN TIMER: For Ex px applications, enclosure pressure < MIN OVERPRESSURE will de-
energize enclosure contacts. Shutdown timer allows the user to select the amount of time to delay
de-energizing the enclosure. This is useful when there are short pressure drops in the system. Range
is from 0 to 300 seconds
UNLOCK TIMER - Unlock timer is used to control the AUX contact output.
Range is from 0 to 300 minutes
Default: Shutdown Timer = 0 seconds
Unlock Timer = 0 min
OPERATION MODE – User-defined. Selections are SA or FA
SA – Semi-automatic. To start a purging min overpressure > set point and the Star/Set button has to
be pressed
FA – Fully-automatic. Once the min overpressure is achieved, purging will begin
Default: SA
VENT FLOW – User-defined. Determines the type of vent that will be used
STANDARD – EPV-6500-__-01, 03, 05 vents are used. These are used when the pressurized
enclosure does not have a containment system.
and is used for dilution of containment systems within the pressurized enclosure.
Default: STANDARD
VALVE CONTROL – User-defined. Determines the type of valve that will be used.
DIGITAL – this controls the ‘DV’ output on the 6500 control unit and will activate a digital valve
(solenoid valve) when purging or low pressure alarm is active. Usually used wit STANDARD
applications. Can be used with the 6500-MAN-DV valve
PROPORTIONAL – This controls the ‘PV’ output on the 6500 control unit and will control flow/
pressure within the enclosure at a set-point for purging and dilution. Usually used with the DILUTION
valve but could be used with the STANDARD valve for more precise control of protective gas supply.
Default: DIGITAL
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