Vaisala HMP260 - Manual (Page 12)

HMP260 SERIES
Operating Manual
HMP260-U017en-1.5
6 1997-11-25
The transmitters should 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 3.6; 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 part of the cable must be inside the process.
When mounted on the side of a duct or channel, the sensor head must be in-
serted from the side (see Figure 3.7). If this is not possible and the sensor head
must be inserted from the top, the point of entry must be carefully insulated.
NOTE
During installation the protective cover of the
protective unit must not be opened and the sensor head
must not be unsoldered from and then resoldered to the
protective unit of the transmitter. This procedure is not
allowed for the user. Vaisala is not responsible for any
damages caused by incorrect use.
3.2.1. HMP263 transmitter
The HMP263 can be installed in ducts and channels with the help of the in-
stallation kit available; the kit consists of a flange, a supporting bar for the
sensor head cable and screws for attaching the flange to the wall of a duct.
With the help of the installation kit the distance between the sensor head and
the channel wall can be easily adjusted. The range of adjustment is 100...320
mm; the distance is measured from the tip of the sensor head to the flange.
supporting bar
sealing
flange
a plugged hole for reference
measurements
duct wall
HAZARDOUS
AREA SAFE AREA
Fig. 3.2 Installing the sensor head of the HMP263 in a channel with the
help of flange and supporting bar