Vaisala CL31 - Warning and Alarm Messages

Chapter 7 ___________________________________________________________ Troubleshooting
VAISALA_______________________________________________________________________ 99
Warning and Alarm Messages
This section describes different warning and alarm messages.
Table 21 CL31 Status, Warnings
Status Message Info Reason Instructions
Window contamination
warning (appears from time
to time and lasts < 5 min)
Usually drizzle drops on the
window.
The blower will clean the window.
If clouds are detected, the height
information is correct. If no clouds
are detected, it is possible that high
clouds are missed.
Window contamination
warning (continuous)
Bird droppings, leaves, dust etc.
have contaminated the window.
Clean the window.
Battery low warning The unit has been powered too
long using the backup battery.
Connect the line voltage or replace
the battery.
Recharging of the battery has
failed.
If the battery is old, replace it. If the
battery is OK, check the operation of
Ceilometer Engine Board CLE321.
Transmitter expires warning Laser diode is too old. Replace Transmitter CLT321. The
measurement data is valid, but it is
possible that some clouds are
missed.
High humidity warning
(option)
Relative humidity > 85 %. Water
has been condensed inside the
ceilometer. Leakage in the
enclosure or leakage in the door.
Take the ceilometer inside, open the
maintenance door and let it dry in a
warm air conditioned place.
Condensed water on optical surface
may disturb the measurement. There
is a danger of short circuits.
Blower failure warning Blower cable is not connected. Check that the blower cable is
connected.
Window blower circuit breaker is
not ON.
Check that the window blower circuit
breaker is ON.
Line voltage level is not correct. Check that the line voltage is present
and correct.
Blower is stuck. Check if visible obstacles disable
blower operation.
Blower is damaged. Replace the blower.
Humidity sensor failure
warning (option)
Humidity sensor is not
connected.
Connect the humidity sensor or
disable the option in the software.
Humidity sensor is damaged. Contact technical support and send
the ceilometer CL31 to Service
Center for the humidity sensor to be
replaced.
Heater fault warning Window blower circuit breaker is
not ON.
Check that the window blower circuit
breaker is ON.
Line voltage level is not correct. Check that the line voltage is present
and correct.
Heater is damaged. Replace the heater.
High background radiance
warning
Direct sunlight. In case there are no alarms, the
measurements are ok. If there is an
alarm, the measurements are invalid.
Ceilometer Engine Board
failure warning
Non-critical fault in Ceilometer
Engine Board CLE321.
Replace Ceilometer Engine Board
CLE321.
Battery failure warning Battery is dead. Replace the battery.