La Crosse Technology WS 550 US - Manual (Page 27)

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The brightness limit can be used to customize the sensor to the local conditions.
The threshold value should be defined at the start and end of sunshine so that the
current brightness value can be referred to the threshold.
- Select the "SYSTEM" menu and then the "SUN CAL" option (via BEEP, DST,
INTERVALL, ALTITUDE, RAIN CAL), the display is:
SUN CAL ENTER
- Touch the "ENTER" field, the display is:
SUN CAL 131 + 085 -
- Touch the "+“ or "-“areas to set the threshold value. The setting area ranges
from 0 to 255.
- Wait a few seconds; the device switches back to the normal mode.
1 You cannot directly convert to the brightness intensity unit Lux.
3.3.8. "CLEANING", menu, Cleaning mode
As the display gets dirty due to touching, it needs to be cleaned now and then using
a dry soft cloth (the best option is to use a spectacles cleaning cloth; however, do
not use any cleaning liquids as they can damage the display). To prevent the station
from getting displaced while cleaning, there is a cleaning mode where all the touch
fields are locked for approx. 20 seconds.
- Select the "CLEANING" menu:
NEXT CLEANING ENTER
- Touch the "ENTER" field, the display is:
CLEANING START
- Touch the "START" field, the display is:
CLEANING WAIT
- The display can now be cleaned. Normal display resumes after 20 seconds.
Reduce the threshold value
Currently set threshold value
Increase the threshold value
Current brightness value 1