Installing the probe – Vaisala HMM100 User Manual

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Chapter 3 ________________________________________________________________ Installation

VAISALA ________________________________________________________________________ 23

Installing the Probe

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.

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.

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.