Chapter 8 ___________________________________________________________________Repair
VAISALA______________________________________________________________________ 105
The following numbers refer to Figure 22 on page 104.
1 =
Internal heater CLH311
2 = Ceilometer Receiver CLR321
3 = Coaxial cable 226296
4 = Receiver ribbon cable
5 = Ceilometer transmitter CLT321
6 = Ceilometer AC power CLP311
7 = Ceilometer engine board CLE321
8 = Data line connector
9 = Optics unit CLO321
10 = Transmitter ribbon cable
11 = AC power cables
12 = No-break battery 4592
13 = Window CLW311
14 = Window Blower CLB311
15 = Laser Monitor Board CLM311
16 = Battery cable
Replacing Window CLW311
Refer to number 13 in Figure 22 on page 104.
NOTE
Vaisala recommends that Ceilometer Window CLW311 is replaced
indoors to prevent water and other contamination from getting into the
measurement unit.
To replace Ceilometer Window CLW311, you will need a 2.5 mm Allen-
key and a screwdriver.
Then proceed as follows:
1. Open the measurement unit door. Then switch the power off with
all three switches (F1, F2, and Battery). For the location of the
switches, see Figure 15 on page 40 and Figure 16 on page 41.
WARNING
Disconnect the power cable from connector J2 before continuing.
2. Close the door and remove the measurement unit. To do this,
loosen the three attachment screws (marked A in Figure 6 on page
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