USER'S GUIDE____________________________________________________________________
30 __________________________________________________________________ M210482EN-D
Using the Tilt Feature
Ceilometer CL31 can operate in a tilted position. The built-in sensor
detects the tilt angle, that is, the deviation from vertical. The tilt feature
allows three tilt angles: vertical, 12 degrees with the measurement unit
door upwards, and 12 degrees with the measurement unit door
downwards. The tilt angle is used for an automatic correction of the
detected cloud base height, enabling accurate measurements also in a
tilted position.
The tilt feature provides the following advantages:
- Protection in heavy weather conditions:
In heavy weather conditions, using a tilt angle of 12 degrees protects
the measurement unit window from precipitation, thus enhancing
performance.
- Precision in aircraft approach control:
The beam can be pointed towards the approach direction of an aircraft.
This is useful, for example, for helicopter approaches, and at sites
where the ceilometer cannot be located exactly at the desired spot.
Tilting the Ceilometer
Remove the measurement enclosure. See Figure 6 on page 28. A 5 mm
Allen-key is needed for tilting.
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Figure 8 Tilting the Ceilometer
1. Loosen the tilting screws on both sides. See Figure 8 above.
2. Tilt the ceilometer shield 12 degrees. It is recommended to tilt the
ceilometer forwards, with the measurement unit door facing down.
Lock it in place with the screws.