Vaisala HMM100 - Manual (Page 25)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 23
Installing the Probe
1. Select the mounting location for the probe:
- The probe should be entirely in the measurement environment, with
sufficient distance to the outer walls of the chamber or duct. Air
should flow freely around the probe.
- The probe location should represent well the environmental or
process conditions, and it should be as clean as possible.
2. Install the probe in the location. Use the probe mounting clamp
(Vaisala order code 226067) if needed. Insert enough cable to the
same space with the probe in order to prevent heat conduction, and
to make it easy to move the probe when performing a calibration.
If you cannot install the probe entirely in the measurement
environment, you can use the probe mounting flange (Vaisala order
code 226061) to mount the probe through the chamber wall. This
installation method is not recommended due to possible heat
conduction.
3. Seal the cable pass-through using the probe mounting flange or
silicone sealant.
CAUTION If you seal the cable pass-through using silicone sealant, do not use a
sealant that releases acetic acid when curing. Acetic acid may damage the
HUMICAP® sensor in the probe.