PN 9000-280-VE, Rev B
Manual Calibration
A calibration gas inlet port (see Figure 2-5.1) is provided to allow you to cali-
brate the system. During calibration, turn off the aspirator supply and inject
calibration gases into the calibration gas inlet port on the analyzer. During
normal operations, plug this calibration gas inlet port. The zero and span cali-
bration gases should be set to 3 SCFH and will require about 10 PSIG relative to
the process pressure. If the process is running 110 PSI, the gas pressure needs
to be 120 PSI.
Remote Calibration Unit Installation (Optional)
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 air to avoid plugging problems.
Figure 2-5.1 shows mounting dimensions for a standard RCU. Use two #10
screws to mount the RCU. Note that only the top left and lower right holes are
used; the other holes hold the RCU to its mounting plate. The ambient tem-
perature range for the RCU is -20 °C to 70 °C. Mount the RCU as close to the
analyzer as possible. Shorter calibration plumbing improves response times,
reduces calibration gas expense, and reduces the chance of contaminants in
the calibration gas plumbing.
To install the RCU:
1. Connect the O
2
span gas, if other than instrument air, to the alternate O
2
span gas inlet.
2. Connect the O
2
zero calibration gas to the O
2
zero gas inlet connection on
the RCU.
3. Connect the combustibles span calibration gas to the combustibles span
gas inlet on the RCU. For a WDG-V UOP analyzer with RTD-type combus-
tibles detector, the combustibles span calibration gas would also include
the methane span calibration concentration.
4. Using appropriate tubing, connect the calibration gas outlet on the right
side of the RCU to the calibration gas inlet on the analyzer. See Figure 2-5.1
for analyzer calibration gas inlet connection.
5. Using appropriate tubing, connect the aspirator air outlet on the right side
of the RCU to the aspirator air inlet connection on the analyzer.
For information about RCU electrical connections, refer to “Remote Calibration
Unit Connections” later in this chapter.
2-14 | Thermox
®
WDG-V UOP ATEX-IECEx Analyzer
Содержание WDG-V UOP
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