Vaisala HMP230 - Manual (Page 11)

HMP230 SERIES
M210225en-B User's Guide
5
3.2. Mounting
3.2.1. Mounting the HMP231
The best position for mounting the HMP231 is with the probe head pointing
downwards. Due to internal heat transfer, the transmitter should not be
mounted with the probe pointing upwards.
133
104
Ø 6.5
Figure 2 Mounting holes in the HMP230 transmitter housing.
3.2.2. Installing the HMP233, HMP234 and HMP235
It is recommended that the cable models HMP233, HMP234 and HMP235 be
mounted with the sensor head horizontally; this way, any water condensing on
the tube cannot flow onto the sensors. When there is no alternative but to
install the sensor head in the process vertically, the point of entry must be
carefully insulated. The cable must also be allowed to hang loosely as in
Figure 6; this prevents any condensed water from running onto the sensor head
along the cable.
If the process temperature is much higher than that of the environment, the
whole sensor head and preferably a piece of the cable must be inside the proc-
ess.
When mounted on the side of a duct or channel, the sensor head must be in-
serted from the side (see Figure 8). If this is not possible and the sensor head
must be inserted from the top, the point of entry must be carefully insulated.