Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 65
CHAPTER 5
MAINTENANCE
This chapter provides information that is needed in basic maintenance of
the HMW90 series.
Periodic Maintenance
Cleaning
The body of the transmitter can be cleaned by wiping with a moistened
lint-free cloth. Do not use cleaning agents or solvents, or blow
pressurized air into the transmitter housing.
Do not attempt to clean contaminated HTM10 modules and HUMICAP
®
sensors. Dirty modules should always be replaced with new calibrated
modules.
Calibration and Adjustment
HMW90 series transmitters are fully calibrated as shipped from factory.
HMW90 series transmitters have a display that makes it easy to compare
the measured readings against any portable calibration reference. Note
that depending on the ordered configuration, the display may be hidden
under the sliding cover.
For adjustment of the measurement, you have the following options:
- 1-point adjustment using the trimmers under the sliding cover. See
section Adjustment Using Display and Trimmers on page 66.
- 1-point or 2-point adjustment using the service port. See the following
sections:
- Adjustment Using an HM70 on page 67.
- Adjustment Using a Computer on page 68.
If adjustment is not enough to restore the measurement accuracy of the
transmitter, you can also replace the measurement module. See section
Replacing the Measurement Module on page 69.
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