7.1.3 Desiccant
Humidity is monitored inside the WS-PRO2 enclosure using the Elan HM2000 RH sensor that is
incorporated in the enclosure. Change the desiccant packs when the enclosure RH exceeds 50%.
The enclosure RH sensor should be changed approximately every five years.
Desiccant packs may be ordered in quantity of 20 individually sealed packs at a time or by the
individual pack.
7.1.4 Sensor maintenance
Perform sensor maintenance at regular intervals, depending on the desired accuracy and the
conditions of use. A suggested maintenance schedule is outlined below.
(p. 103) provides an example of a maintenance log file for one year of station use.
1 week
l
Check the rain gauge screen and funnel for debris and level.
1 month
l
Check the solar radiation sensor (pyranometer) for level and contamination. Gently clean
with blast of dry air, soft camel hair brush, or clean water if needed.
CAUTION:
Handle the pyranometer carefully when cleaning. Be careful not to scratch the surface
of the sensor.
l
Do a visual/audio inspection of the 034B-ET anemometer at low wind speeds. Worn
bearings can cause the wind cups to spin in an uneven manner and/or make a grinding
sound.
l
Check the WindSonic1-ET for contamination. If needed, gently clean the WindSonic1 with a
cloth and mild detergent.
CAUTION:
When cleaning the WindSonic1, do not use solvents and avoid scratching the sensor.
3 months
l
Clean the radiation shield by removing the two knurled thumb screws holding it to the
crossarm. Gently pull the sensor out of the shield. Clean the radiation shield using warm
mildly soapy water. Rinse with clean water and allow the shield to dry before putting it back
on the crossarm.
Section 7. Maintenance and troubleshooting
66
Summary of Contents for WS-PRO2
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