Vaisala HMP230 - Manual (Page 22)

HMP230 SERIES
User's Guide
M210225en-B
16
3.2.7.2. Installing the probe through the ball valve assembly
The best way to install the sensor head is through the ball valve assembly. Use
a 1/2” ball valve assembly with a ball hole of
∅
14 mm or more. In this kind of
installation, it is not necessary to empty or shut down the process for installing
or removing the sensor head. If the sensor head is installed in a process pipe,
please note that the nominal size of the pipe must be at least 1 inch. See pages
16 - 19 for detailed instructions.
Figure 15 Installing the sensor head through the DMP248BVS ball valve
assembly
NOTE
The probe can be installed in the process through the
ball valve assembly provided that the process pressure
is less than 10 bars. This way, the process does not have
to be shut down when installing or removing the probe.
However, if the process is shut down before removing
the probe, the process pressure can be max. 40 bars.