Vaisala LT31 - Cleaning RAINCAP; Cleaning Window of Optional LM21

Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 197
Cleaning RAINCAP
®
Vaisala RAINCAP
®
Rain Sensor should be cleaned every six months or
more often depending on the conditions.
NOTE
The measuring principle does not allow for proper ESD protection of the
RAINCAP
®
electronics, so you must follow the instructions given
below:
- Ground your hand first by touching grounded metallic parts of the
installation to remove excessive static charges from your body.
- Clean the RAINCAP
®
rain detector carefully with a soft, lint-free
cloth moistened with mild detergent. Be careful not to scratch the
surface.
- Check that the detector is free of ice and snow deposits
Cleaning Window of Optional LM21
The LM21 window needs to be cleaned occasionally either due to a
contamination warning or during the periodic maintenance. In this frame,
the inner surface of the weather protection hood should be cleaned as
well.
To access the LM21 window, no parts have to be removed.
1. Wipe the window with a soft, lint-free cloth and normal glass
cleaner or isopropyl alcohol. Be careful not to scratch the window
surface. The window should dry up rapidly. There should be no
wiping stripes or remaining dirt on the surfaces.
2. Check that the weather protection hood is free of ice or snow
deposits.
3. Wipe the dust from the inner and outer surface of the hood.
NOTE
Do not use any sharp tools to remove ice or snow from the hood,
especially from its heated surface. This can easily break the heating foil.
Do not try to insert any tools under the foil because the foil glue may
then fail to hold the foil on the hood surface. It is essential that the foil is
firmly attached to the hood surface, otherwise the heat transfer from the
foil piece to the hood is impaired resulting in a burned foil.
4. After the windows have dried up, the cleaning activity should be
finalized with the CALIBRATE WINDOW_CLEAN LM
command.
- Enter the LT31 command mode (OPEN command)