Chapter 3 ______________________________________________________ Installation of the Mast
VAISALA _______________________________________________________________________ 47
Cloud Detection
Align the ceilometer with the optical window pointing away from the
sun, that is, north in the northern hemisphere (south in the southern
hemisphere), to keep excess sunlight from out of the sensor. When
siting the ceilometer make sure that the optical window can be
oriented so that it has clear view of the sky. The lens should not be
shadowed by any obstacles.
The ceilometer does not have to be mounted vertically straight,
because it is equipped with two tilt-angle sensors.
Site Preparation
Power Supply and Communication
Lines
Before assembling the mast the power supply and communication
lines must be available. The primary AC (mains) power service must
comply with the National Electrical Code (NEC) or equivalent
specifications for grounding the primary power service entrance. The
mains must be continuous and without spikes and blackouts. If the AC
(mains) voltage is fluctuating more than the given tolerance, AC
(mains) voltage stabilizers are recommended.
The following applies to all field cabling:
- Use armored field cables.
- Cables must be suitable for underground use.
- Check the cable core diameter according to maximum allowable
drop.
- Route the cables through conduits to the equipment.
- Check cable conduit diameters or use additional termination boxes.
- Ground the cable shield at both ends.
- Use spike and overvoltage protection devices at both ends of field
cables.
Always make a detailed cabling and wiring plan. Data transmission
lines from the outdoor sites to indoor devices have to be prepared
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