PN 9000-280-VE, Rev B
Purging Instructions
Ensure that the protective gas supply is connected, the enclosure power is
deenergized and the alarm system is energized (if being used).
1. Carefully read the Start-Up Instruction on the unit.
2. Check the operation of the
Enclosure Protection Vent
by
gently prodding the vent flapper open with a soft pointed object, like the
eraser end of a pencil, to ensure that the vent valve works freely. On verti-
cally configured vents, this can be done from within the analyzer enclo-
sure.
3. Seal the protected enclosure(s).
4. Unlock the
T-Bar Valve Key
from the
Rapid Exchange Control Valve
(RECV) stem and place in the
Enclosure Pressure Control Valve
(EPCV)
stem. Turn the key counter-clockwise to open the EPCV stem and set the
Enclosure Pressure Gauge
at “Safe” pressure. The Pressure Loss Alarm
Switch (if being used) should then activate to silence the alarm system.
5. Carefully remove the T-Bar Valve Key from EPCV stem. Ensure
Enclosure
Pressure Gauge
“Safe” pressure setting is stable.
6. Use the T-Bar Valve Key to open the RECV turning a full 90° counter-clock-
wise to ensure that the Enclosure Protection Vent opens.
The Enclosure Pressure Gauge should move quickly off scale to the
right. This is normal for all Rapid Exchange purging systems.
7. Open the
Furnace Purge Valve
by turning the valve counter-clockwise.
The exchange time is ten (10) minutes minimum.
8. Close both the RECV and
Furnace Purge Valve
fully and ensure T-bar Valve
Key is firmly locked in the RECV stem.
9. Wait for the Enclosure Pressure Gauge to return to a “Safe” pressure and en-
ergize the protected enclosure(s) power using the local disconnect switch.
10. Ensure the Enclosure Pressure Indicator maintains a “Safe” pressure before
leaving the system unattended.
2-12 | Thermox
®
WDG-V UOP ATEX-IECEx Analyzer
Содержание WDG-V UOP
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