Vaisala HMT310 - Manual (Page 25)

Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 25
also be allowed to hang loosely as this prevents any condensed water
from running onto the probe along the cable.
0507-022
Figure 7 Vertical Mounting of Probe
The following numbers refer to Figure 7 above:
1 = To be sealed
2 = Insulate
the cable
3 = To be insulated
4 = Let the cable hang loosely. This prevents condensed water
running to the sensor along the cable.
NOTE Please do not attach a heated probe (HMT317) to metal structures to
avoid condensation problems caused by heat conduction along the metal.
If the process temperature is much higher than that of the environment,
the whole probe and preferably a piece of the cable must be inside the
process. This prevents measuring inaccuracies caused by heat conduction
along the cable.
When mounted on the side of a duct or channel, the probe must be
inserted from the side of the duct. If this is not possible and the probe
must be inserted from the top, the point of entry must be carefully
insulated.
HMT313 for General Use
The HMT313 is a small size (d = 12mm) general-purpose probe suitable
for ducts and channels with the installation kit available from Vaisala.