User's Guide ______________________________________________________________________
88 __________________________________________________________________ M210482EN-B
Table 19
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 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
CLT311.
Laser does not get electrical
power.
Check from the status message
that the line
Voltages
is marked
OK
.
Receiver failure alarm.
Receiver CLR311 is
damaged.
Replace CLR311.
Loose cable connection.
Check that the cables from
Receiver CLR311 and Ceilometer
Optics CLO31 are undamaged and
correctly connected.
Receiver test not operating.
Check that the Optics unit CLO31
is not misplaced or damaged.
Voltage failure alarm.
Ceilometer Engine Board
CLE311 is damaged.
Replace CLE311.
Alignment failure alarm.
Optics alignment is faulty.
Contact Vaisala Helpdesk and
send the measurement unit to
Vaisala for repair.
Memory error alarm.
A failure in the CLE311
memory.
Replace CLE311.
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.
