Chapter 8 ___________________________________________________________________ Repair
VAISALA _______________________________________________________________________ 93
Replacing Ceilometer Laser Transmitter
CLT311
WARNING
Ceilometer Transmitter CLT311 emits invisible laser radiation,
which is harmful to the eye if viewed at a short distance. Never
remove the Ceilometer Transmitter from its normal position without
first switching off both the line and the battery power and detaching
the transmitter ribbon cable from the Ceilometer Engine Board
CLE311.
CAUTION
Servicing the equipment must only be performed by qualified
maintenance personnel.
The transmitter should be replaced if the ceilometer unit has been
generating warnings and alarms, and a malfunction with the operation
of the transmitter has been detected.
To replace Ceilometer Laser Transmitter CLT311, you will need a
2.5 mm Allen-key.
Then proceed as follows:
1.
Open the measurement unit door and confirm that there is an
active transmitter failure. In case of a transmitter failure, the
CLT ok
LED will be turned off. Refer to Figure 19 on page 99.
2.
Switch the power off with all three switches (F1, F2, and
Battery). For the location of the switches, refer to Figure 18 on
page 98 and Figure 19 on page 99.
WARNING
Disconnect the CT3839 power cable before continuing!
3.
Detach the transmitter ribbon cable from Ceilometer Engine
Board CLE311.
