Ametek Thermox Series 2000 WDG-IV User Manual page 40

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Figure 3-4. Mounting dimensions - lift-off sensor.
3-8 | Thermox Series 2000 WDG-IV / IVC / IVCM
Methods for mounting the sensor
There are three methods for mounting a WDG-IV sensor to the process:
flush with the process,
using a customer-supplied pipe nipple,
using a customer-supplied flange.
Each of these methods is explained in the sections that follow. The flush
mount method is preferred because it positions the sensor as close to the
process as possible and minimizes the chances of the sample gas cooling
below its dewpoint.