Vaisala HMP110 - Manual (Page 55)

Chapter 5 ______________________________________________________________ Maintenance
VAISALA _______________________________________________________________________ 53
CHAPTER 5
MAINTENANCE
This chapter provides information that is needed in basic maintenance of
the HMP60 and HMP110 series probes.
Periodic Maintenance
The humidity measurement accuracy of the HMP60 and HMP110 series
probes should be calibrated yearly. When calibration indicates that
accuracy is not within specification:
- HMP60 and HMP63: change the INTERCAP® Sensor.
- HMP110 and HMP113: adjust the measurement yourself, or have it
adjusted at a Vaisala Service Center.
Light cleaning of the probe, and replacement of the filter should be done
only when necessary.
Cleaning
The probe body can be wiped clean with a soft, lint-free cloth moistened
with mild detergent. Do not use solvents or compressed air.
Note that wiping the membrane filter or stainless steel sintered filter may
block its pores and/or deposit residue on the filter. If the filter is heavily
contaminated, replace it.
Changing the Filter
The filter on the probe should be replaced when it is damaged or dirty.
1. Turn the filter counter-clockwise to loosen it.
2. Remove the filter from the probe. Be careful not to touch the
sensors with the filter. Without the filter in place, the sensors are
easily damaged – handle the probe carefully.
3. Install a new filter on the probe, and tighten it so it is finger-tight.
Make sure the filter sits straight and meets the threads properly.