PN 9000-133-VE, Rev U
Installing the Remote Calibration Unit (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.
Remote calibration unit (RCU) mechanical installation includes the following:
• Mounting the RCU.
• Plumbing calibration gases to the RCU.
• Plumbing the RCU to the analyzer.
This section describes instructions for
Standard
RCU and
Combustibles
RCU
mechanical installation. Follow the section that applies to the type of RCU
used in your application.
Standard RCU Installation
Figure 2-9.1 shows mounting dimensions for a Standard RCU. Use two (2) #10
screws to mount the RCU. Note that in Figure 2-9.1 only the top left and lower
right holes are used; the other holes secure the RCU to its mounting plate.
The ambient temperature 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 analyzer with RTD-type combustibles
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 2-12
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” in this chapter.
2-16 | Thermox
®
WDG-V / VC / VCM / VM
Summary of Contents for WDG-V
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