User's Guide ______________________________________________________________________
194 _________________________________________________________________ M210667EN-C
Cleaning Instructions
The major maintenance aspect is in cleaning of the LT31 transmitter and
receiver windows, the PWD Sensor lenses, PWD RAINCAP
®
Rain
Detector, and all the equipment housings.
NOTE
Always calibrate LT31 after cleaning. Do not clean the windows if the
weather conditions do not allow calibration to be performed immediately
afterwards, that is, if it rains or if visibility is less than 10 kilometers.
Cleaning LT31 Windows and Weather
Protection Hoods
The LT31 windows need to be cleaned occasionally, either due to a
window contamination warning (see section Status Messages on page
261) or during the periodic maintenance. In this frame, the inner surface
of the weather protection hoods should be cleaned as well.
To access the LT31 windows, no parts have to be removed.
1.
Wipe the windows with a soft, lint-free cloth and normal glass
cleaner or isopropyl alcohol. Be careful not to scratch the glass
surfaces. The windows should dry up rapidly. There should be no
wiping stripes or remaining dirt on the surfaces. See Figure 111
below.
0401-063
Figure 111 LT31 Windows
2.
Check from the outside that the inner window surfaces are free of
any water condensation.
3.
Check that the weather protection hood is free of ice or snow
deposits.
4.
Clean the inner weather protection hood surface in the same way as
the window surfaces.