Vaisala CT25K - Alarms

Ceilometer CT25K
User’s Guide CT25K-U059en-2.1
96
7.2.2 Alarms
Problem Reason Instructions
Laser temperature shut-
off
Direct sunlight Direct sunlight can burn the laser
diode. Use Tropics window or turn
the ceilometer away.
Environment
temperature too high
Do not operate the ceilometer.
Laser failure Laser is worn out or
damaged
Check the operation of laser
transmitter CTT21 and its cable
connections.
Laser does not get
electrical power
Check from the status message if
there is an asterisk (*) in front of any
voltage value indicating malfunction
in the DPS52 DC Converter board.
Outgoing laser
power failure
Check that the Optics Monitor
CTL21 board is not misplaced or
damaged.
INLASER setting
does not function
Check the operation of the
Ceilometer Interface Board DCT51.
Receiver failure Loose cable
connection
Check that the cables from the
receiver CTR21 and from the Optics
monitor CTL21 are undamaged and
connected correctly.
Receiver test not
operating
Check that the Optics Monitor
CTL21 board is not misplaced or
damaged.
Voltage failure DC Converter board
DPS52 is damaged
Check the status message. If there is
an asterisk (*), the voltage exceeds
the limits.