Vaisala SHM40 - Manual (Page 51)

Chapter 5 ______________________________________________________________ Maintenance
VAISALA _______________________________________________________________________ 49
CHAPTER 5
MAINTENANCE
This chapter provides information that is needed in basic maintenance of
the SHM40 kit.
Periodic Maintenance
Cleaning
HM40 indicator can be cleaned by wiping it with a moist cloth.
If the filter on the HMP40S probe becomes contaminated, it is very likely
to affect the humidity measurement since residue on the filter will retain
some moisture. Dirty filters must be replaced.
Do not use solvents to clean the HM40 indicator or the HMP40S probe.
Do not spray anything directly on the HMP40S, since that may deposit
impurities on the sensor.
CAUTION Do not immerse the HM40 indicator or the HMP40S probe in liquid.
CAUTION 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 HMP40S probe.