Omega CMDP Series User Manual page 9

For Pipe Mount configurations
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Roscid supplies a Hex Bushing: Red Brass, 1 1/2 in x 1 in Fitting Pipe Size, Male NPT x Female NPT, Class 125.
Black flow rate cap
The sensor head (black flow rate cap) should be installed at least 1" into the process gas.
If the reading is oscillating, you might need to adjust the black flow rate cap, slowing the flow rate down.
Chilled Mirror Hygrometer, a fundamental first principal measurement for dew point:
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