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Maintenance, Cleaning – Vaisala HM40 User Manual

Page 33

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Maintenance

Cleaning

The HM40 can be cleaned by wiping it with a moist cloth.

If the filter becomes contaminated, it is very likely to
affect the humidity measurement since residue on the
filter will retain some moisture. Dirty filters should be
replaced.

Do not use solvents to clean the HM40. Do not spray
anything directly on the HM40, since that may deposit
impurities on the sensor.

Do not immerse the HM40 in liquid to clean it.

Do not attempt to clean the sensor element that is
located inside the filter. Any touching (or blowing
with pressurized air) may damage it. If the
measurement accuracy cannot be restored by
calibration and adjustment, it is time to replace the
HMP113 probe.