Chapter 6 _______________________________________________________________ Maintenance
VAISALA _______________________________________________________________________ 125
CHAPTER 6
MAINTENANCE
Cleaning FSM102 Windows
The cleaning of windows and hoods is the only periodic maintenance
task required. The FS11 sensor can compensate for a reasonable amount
of window contamination, but when a certain limit is exceeded, cleaning
is required.
The windows and hoods must be cleaned at least every six months or
more often, depending on the conditions (for example, if there are roads
nearby). In an airport environment the cleaning should be done every
three months. The cleaning should be done immediately if the warning
WINDOW CONTAMINATED has been received in the status message.
The cleaning is done as follows:
1. Wipe the windows with a soft, lint-free cloth and isopropyl alcohol.
Be careful not to scratch the window surfaces. The windows should
dry up rapidly to indicate that the window heating is functioning.
2. Check that the assembly of the hoods and optics is free of water
condensation and ice or snow deposits.
3. Wipe the dust from the inner and outer surfaces of the hoods.
NOTE
Do not use any sharp tools to remove ice or snow from the hoods,
especially from their heated surfaces. This can easily break the heating
foils. Do not try to insert any tools under the foils, because the foil glue
may then fail
to hold the foil on the hood surface. It is essential that the
foils are 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 optical surfaces are properly cleaned, check that the
WINDOW CONT values of both the receiver and transmitter in the
status message are close to zero. This can also be checked
afterwards through a remote (modem) line.
NOTE
The windows must be dry before checking th
e WINDOW CONT values.
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