Perma Pure Mini-GASS 2812T - Manual (Page 34)

System Startup –
1. Verify that AC power to the sampling system enclosure is disconnected.
2. Turn the sampling system power and sample pump switches to the ON position.
3. Adjust the membrane dryer purge air pressure to 15 psig and the flow meter to 20 lpm.
Sampling systems with the sample pump option have an air line that blows air directly
on the sample pump motor to prevent overheating. The “hissing” sound of the air is
normal and is not a leak.
4. Close both of the sampling system enclosure covers and tighten the screws. It is not
necessary to close the Z-Purge enclosure cover since this enclosure is not purged or
pressurized.
5. Ensure that the vent hole at the bottom of the sampling system control enclosure in not
blocked or obstructed in any way.
6. Adjust the Z-Purge pressure regulator by turning the knob clockwise until the Z-Purge
gage indicates in the middle of the “Safe” area. Lock the knob by pressing it in.
7. Wait 10 minutes for the enclosure “start-up” purge. This is necessary to rid the
sampling system enclosure of any hazardous gases.
8. Connect the sampling system to the appropriate AC power source. The system will turn
on and the system will begin to heat up. When the system temperature comes to within
10C of the temperature controller set-point, the sample gas pump will start and sample
gas will begin to flow.
Z-Purge Monitoring Operation -
Any time the sampling system enclosure pressure falls below the “safe” range, the alarm
indicator will light and AC power will be automatically disconnected from the system. This
can be caused by:
z
Loss of the compressed air supply
z
Opening either of the sampling system enclosure covers
z
Any event that causes the sampling enclosure pressure to fall below the “Safe” range.
Operation of the sampling system with the Z-Purge system disconnected (non-hazardous
areas only)-
In non hazardous areas it is possible to operate the sampling system with the Z-Purge
system enclosure disconnected. The Z-Purge feature is effectively disabled by switching
the Z-Purge over-ride switch to the “Setup” (ON) position.
Safe operation of this system requires that this procedure should be repeated any
time the sampling system enclosure covers are opened for more than a few seconds.