Vaisala HMP230 - Manual (Page 17)

HMP230 SERIES
M210225en-B User's Guide
11
Figure 8 Mounting the sensor head on a duct or channel.
When the sensor head is installed in a duct or channel, the temperature differ-
ence between the air in the duct and outside it must be small as the sensor
head conducts heat.
3.2.6. HMP237 transmitter
HMP237 has a small size probe made of stainless steel. The sensor head
withstands temperatures -40...180 ºC (-40...356 ºF) and pressure up to 10 bar
(1MPa, 145 psi). The probe is suitable for applications where a mechanically
very durable leak proof probe is needed. The sensor head of the HMP237 can
be installed in a channel with the help of flange and supporting bar (see Figure
3). Duct and cable installations are shown in Figures 9 and 10.
Figure 9. HMP237 Duct
installation.
1. Make hole with PG13 thread
in the measurement chamber or
process wall. The smoothness of
the thread circle should be
R= 6.3 microm.
2. Install the cable gland (AGRO
nr 1113.60.15) on the thread of
the process wall.
3. Push the probe through the
gland so deep that the backside of
the probe is flust with the cable
gland nut.
4. Tighten the cable gland nut,
the probe will lift up slightly.
Cable gland (AGRO 1113.60.15)