Vaisala AWS330 - Manual (Page 185)

Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 183
Pyranometer CMP6
Periodic Maintenance
The pyranometer is an all-weather instrument. Once installed, the
pyranometer needs little maintenance. It is recommended that you clean
the glass dome of the sensor as part of a regular routine, using water or
alcohol. Check the fixture and leveling of the sensor as needed.
A periodic check is recommended to ensure that the pyranometer is level
and that the silica gel desiccant in the drying cartridge is still colored
orange. When the silica gel is turned from orange to completely
transparent (normally after several months), it must be replaced by fresh
silica gel.
When changing the desiccant in the drying cartridge (indicated with an
arrow in Figure 110 below):
- Make sure the surfaces of the pyranometer and the drying cartridge
that touch the rubber O-ring are clean. Corrosion, dirt, and water can
damage the sensor.
- The rubber O-ring is coated with a silicon grease to improve the seal.
If the rubber O-ring looks dry, apply grease or Vaseline to it.
- Check that the drying cartridge is tightly threaded into the sensor
body.
1012-214
Figure 110 Pyranometer CMP6, Arrow Points to Drying
Cartridge
O-ring type: 24 × 3.0 NBR (nitrite rubber).