PN 9000-280-VE, Rev B
Aspirator and Manual Calibration Connections
The WDG-V UOP processes run at either atmospheric pressure, 35 PSI, or 110
PSI.
Aspirator, calibration, and reference gas pressures must be set relative to the
process pressure.
Reference gas pressure is required for High Pressure (110 PSI) only.
Aspirator N
2
Connections
During process start-up and whenever power is removed from the
analyzer, the aspirator should be turned off and nitrogen applied to
the calibration gas port at 3 SCFH flow to ensure the process gas is
purged from the analyzer. The 3 SCFH nitrogen purge through the
calibration port should be maintained until the analyzer is turned on
and is hot – preferably 24 hours.
Do not turn on the aspirator until the analyzer has been turned on and
is hot – preferably 24 hours. If you turn off the analyzer or the process
is shut down, turn off the aspirator to avoid plugging problems.
Connect N
2
aspirator supply to the aspirator inlet on the analyzer (see Figure
2-5.1). Adjust the aspirator regulator to the minimum pressure required to get
a response from the analyzer (typically 3–5 PSI above the process pressure).
If you have a remote calibration unit (RCU), skip the “Manual Calibra-
tion” section and proceed to the “Remote Calibration Unit Installation
(Optional)” section.
Installation and Start-Up
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