Vaisala CL31 - Table 22 CL31 Status, Alarms

USER'S GUIDE____________________________________________________________________
100 _________________________________________________________________ M210482EN-D
Status Message Info Reason Instructions
Laser monitor failure
warning
Laser power monitor board
CLM311 has failed.
Replace CLM311.
Laser power measurement on
Ceilometer Engine board
CLE321 has failed.
Replace CLE321.
Receiver warning A non-critical CLR321 Receiver
failure.
Replace CLR321.
Tilt angle > 45° warning The unit is not correctly installed
or the tilt angle is larger than
45°.
Check the installation. The height
measurement accuracy is lost with
tilt angles greater than 45°.
Table 22 CL31 Status, Alarms
Problem Reason Instructions
Transmitter shut-off alarm
(Laser temperature > 85 °C)
Direct sunlight has heated the
laser.
Wait for the sun to exit the field-of-
view. CL31 will return to normal
operation.
Environment temperature is too
high.
Check if there is a specific reason
for the high temperature.
Transmitter failure alarm Laser is worn out or damaged. Replace Laser Transmitter CLT321.
Laser does not get electrical
power.
Check from the status message that
the line Voltages is marked OK.
Receiver failure alarm Receiver CLR321 is damaged. Replace CLR321.
Loose cable connection. Check that the cables from Receiver
CLR321 and Ceilometer Optics
CLO321 are undamaged and
correctly connected.
Receiver test not operating. Check that the Optics unit CLO321
is not misplaced or damaged.
Voltage failure alarm Ceilometer Engine Board
CLE321 is damaged.
Replace CLE321.
Memory error alarm A failure in the CLE321 memory. Replace CLE321.
Light path obstruction alarm Window is badly contaminated or
severely scratched.
Clean the window or in case of
damage, replace CLW311.
Something blocks the laser
beam.
Check the clarity of the optical path.
Receiver saturation alarm Direct sunlight. Wait for the sun to exit the field-of-
view. CL31 will return to normal
operation.
Something is partially blocking
the laser beam.
Check the clarity of the optical path.