Vaisala HMP230 - Manual (Page 20)

HMP230 SERIES
User's Guide
M210225en-B
14
The fitting body can be installed e.g. on standard pipe fittings (G 1/2 ISO
228/1) or on a thread in the process wall. If the wall thickness is more than
10.5 mm, it is recommended to use a welded sleeve (see Figure 14). Note that
the minimum recommended distance of the fitting body and probe head is 40
mm (see Figure 12).
Adjust the probe to a suitable distance according to the type of installation and
tighten the clasp nut first manually; mark the fitting body and the clasp nut
and tighten the nut a further 50...60
°
with a fork spanner (see Figure 13).
60°
p
ro
b
e
fitting body
clasp nut
max.
a pen
Figure 13 Tightening the clasp nut.
NOTE
Be careful not to tighten the clasp nut more than 60
°
as
this may result in difficulties when trying to open it.
When the probe is installed directly on the process wall or pipe, note that a
closing valve may be needed on both sides of the installed probe so that the
sensor head can be removed from the process for calibration and maintenance.
If the sensor head is installed in a pressurized chamber, always make sure that
the pressure of the chamber is equalized with the ambient pressure prior to
removing the probe.