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in_m22.doc
Installation of the electronics module
Once the base plate has been
installed and wired, the
electronics module can be
inserted and secured with the
screws provided. The
transmitter is ready to operate.
Maintenance
Cleaning or replacing the dust filter of the HygroClip S
The dust filter should be cleaned from time to time, depending on the conditions of measurement.
Cleaning should be done without removing the filter from the probe. Clean the filter with a fine brush. If
this is not sufficient, the filter should be replaced. To do this, unscrew the filter from the probe.
Before putting on a new dust filter, check the alignment of both sensors with the probe. The wires that
connect the sensors to the probe are very thin and bend easily. If this happens, correct the alignment
by holding the sensor very gently with a pair of small flat nosed pliers.
Periodic calibration check of the probe
Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 %RH
per year. For maximum accuracy, calibration of the probe should be verified every 6 to 12
months. Applications where the probe is exposed to significant pollution may require more
frequent verifications.
Both the Pt 100 RTD temperature sensor and associated electronics are very stable and should
not require any calibration after the initial factory adjustment.
For routine calibration checks, the probe should be verified at one or two values of humidity. For
more details, see
service connector
,
accessories - service cable
and
appendix 2
–
calibration
Note: the electronics module of the M22 transmitter should not require any field calibration and it can
be easily validated by using a probe simulator (see
accessories
). The electronics module cannot be
serviced in the field and should be returned to the factory if there is any problem.
