User's Guide ______________________________________________________________________
178 _________________________________________________________________ M211296EN-A
Air Temperature and Relative Humidity Probe
HMP155 Maintenance
Visual Check
Every three months, check that the temperature and humidity probe
mounting is secured and that the cable is in good condition.
Cleaning
Clean the probe with a soft, lint-free cloth moistened with mild detergent.
Changing the Probe Filter
Every six months, change the probe filter:
NOTE
Depending on the conditions of the measurement site, such as air
pollution and dust, the probe filter may need to be changed more
frequently.
NOTE
When handling the probe, do not touch the sensor heads (numbers 3 and
4 in Figure 108 on page 179).
1. Remove the probe from inside the radiation shield.
1. Carefully remove the filter from the probe: screw it counter-
clockwise, the pull it out without touching the sensor heads.
2. After removing the filter, check the O-ring and change it if
necessary. See Figure 108 on page 179. Do not touch the sensor
heads.
3. Without delay, install th
e new filter carefully on the probe without
touching the sensor heads.
New filters can be ordered from Vaisala (order code: 219452SP, includes
sintered Teflon filter and O-ring).
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