Vaisala HMP228 User Manual
Page 12
HMP228
Operating Manual
M210282en-A
6
2.2.3
Installing the probe through the ball valve assembly
It is recommended that the sensor head is installed in the process through the
ball valve assembly. Use a 1/2" ball valve assembly with a hole diameter of
14 mm or more. With this 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 Figure 2.2.3.1. for detailed instructions.
probe
handle
ball of the
ball valve
(hole diameter
> 14 mm)
process pipe / chamber
>30 mm
Figure 2.2.3.1
Installing the sensor head through the 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 for installing or removing the probe.
However, if the process is shut down before removing
the probe, the process pressure can be max. 20 bars.