Ametek Thermox WDG-V, User Manual

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3-14 | Thermox WDG-V / VC / VCM with Blow Back
Figure 3-14. RCU mounting dimensions - O
2
-only.
Standard RCU
Make the following calibration gas connections to the standard RCU. Fig-
ure 3-14 shows standard RCU calibration gas connections:
1. Connect instrument grade air that is free of oil or dirt to the instru-
ment air inlet connection on the left side of the RCU. If you are also
using instrument air as your span gas, you can skip Step 2 below
because instrument air will be used for both aspirator air and the span
calibration gas.
2. If you wish to use a span gas other than instrument air, you must
purchase the optional alternate span gas kit. Connect the span gas to
the alternate span gas inlet on the RCU if your span gas is other than
instrument air.
3. Connect the O
2
zero calibration gas to the O
2
zero gas inlet connection
on the RCU.
4. Connect the calibration gas outlet on the right side of the RCU to the
calibration gas inlet on the sensor -see Figure 3-9 for the calibration gas
inlet connection on the WDG-V sensor. Also, be sure to install the sup-
plied check valve as close to the sensor as possible - note the orienta-
tion of the valve.
5. Connect the aspirator air outlet on the RCU to the aspirator air inlet
connection on the sensor.