Vaisala HMP140 User Manual
Page 8
HMP140A SERIES
Operating Manual
U175en-1.5
4
1999-12-08
3.2.1
Mounting the HMP141A
The optimal installation of the HMP141A is with the sensor head pointing
downwards. Upward mounting should be avoided due to internal heat transfer.
4
1. Mounting and wiring:
cable feedthrough
on the surface or
in the connection box.
2. Mount the protection
lid to the connection
box.
3. Push the sensor head
through the protection
lid as in figure and
connect the electronics
housing to the connection
box. Make sure that the
pins at the bottom of
the electronics housing
are in contact with the
screw terminal.
4. Fasten the four
connecting screws of
the electronics housing.
5. Place the sensor head
into the protection lid.
6. Close the cover and fasten
the two connection screws.
1
2
3
5
6
4
4
4
Figure 3.2.1
Mounting of the HMP141A
3.2.2
Mounting the HMP142A
The HMP142A transmitter should be mounted with the sensor head
horizontally whenever possible. This way, any water that might condense on
the tube cannot flow on to 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.