Chapter 6 ________________________________________________ Maintenance
VAISALA__________________________________________________________35
CHAPTER 6
MAINTENANCE
This chapter provides information that is needed in the basic
maintenance of the product.
Cleaning the Window
The cleaning of the window and the hood is the only
periodic maintenance task required. The LM21 sensor can
compensate for a reasonable amount of window
contamination, but when a certain limit is exceeded cleaning
is required.
The window and the hood must be cleaned at least once a
year or more often depending on the conditions (for
example how close the runway is). In an airport
environment the cleaning should be done every six months.
The cleaning should be done when the window
contamination value in the status message has reached 10
%. The window should be dry when the window
contamination value is checked.
The cleaning should be done as follows:
1. Wipe the window with a soft, lint-free cloth and
isopropyl alcohol. Be careful not to scratch the window
surfaces. The window should dry up indicating that the
window heating is functioning.
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