INSTUM_01378 Pag. 7/12
4 Diagnostics
4.1 External visual check
1. Check that the external anti-radiant shield is clean and with no dents (a suitably clean shield
will have a higher reflecting capacity).
2. Check for the fan (in the forced ventilation models) proper operation.
4.2 Internal visual check
Draw out the sensor from the shield and:
1. Check that the porous filter protecting the sensitive element is properly clean (see §5.2).
2. Check that the hygrocapacitive element is properly clean. Check for any presence of dust or
dew on the capacitive plate (if possible also with the help of a magnifying lens). Check as
well that contacts are free from oxidations. Do not touch the capacitive plate with your hands.
If necessary, clean the element (see §5.2).
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