User's Guide ______________________________________________________________________
30 __________________________________________________________________ M210482EN-B
The tilt feature provides the following advantages:
- Protection in heavy weather conditions:
Using a tilt angle of 12 degrees protects the measurement unit
window from precipitation, thus enhancing the performance in
heavy weather conditions.
- Precision in aircraft approach detection:
The beam can be directed towards a direction that better represents
the approach of an aircraft than the straight vertical. This is useful,
for example, for helicopter approaches, and sites where the
ceilometer cannot be located exactly at the desired spot.
WARNING
When tilting the unit, make sure that nobody is watching it with
binoculars or other magnifying optics.
NOTE
To avoid direct sunlight, tilt the unit away from the sun. That is, tilt it
north in the northern hemisphere and south in the southern
hemisphere. Direct insolation exposure will not damage the unit but
will cause alarms and temporarily invalidate the data
As these advantages may be contradictory or cannot be realized
simultaneously, the user must decide the direction of the final
installation.
Mobile Operation Aspects
The small and lightweight measurement unit of Ceilometer CL31 is
also suitable for mobile operation. It has a built-in 12 V battery, which
enables operation without external power supply for about an hour in
normal room temperature.
NOTE
For switching the CL31 power fully off, also turn off the battery
switch in addition to the line power switch. Having the unit on with
the battery supply will only drain the battery.
