User's Guide ______________________________________________________________________
216 _________________________________________________________________ M210667EN-C
Replacing Main Transmitter Module
LTL112
The LTM112 transmitter measurement unit of the LT31 is equipped with
the main transmitter module LTL112. In case of a faulty main transmitter
module, the measurement unit has to be opened for replacing purposes.
NOTE
To replace the main transmitter module LTL112, the measurement unit
has to be opened. For this reason it is highly recommended to dismount
the complete measurement unit and carry out the replacement work on a
clean workbench in a dry room.
NOTE
If the weather conditions allow, it is possible to replace the main
transmitter module on site. In that case, the measurement unit can
remain installed on the mast.
To access the transmitter measurement unit, the AC power has to be
switched off first and then the measurement head cover has to be
removed.
1. Remove the upper interface unit cover and open the interface unit
with the provided key.
NOTE
Switch the AC switch off, before you proceed with the next steps. In
case of the optional LTBB111, switch the battery backup switch off as
well. See Figure 40 on page 83.
2. Loosen the three lock screws at each side of the measurement head
cover and carefully remove the cover from the measurement head.
See Figure 95 on page 140.
3. The measurement unit is fixed with two fastening screws. Through
the mast adapter of the support unit, these two hex-socket screws,
size 4 can be reached. See Figure 78 on page 118.
The following steps should be carried out in a closed room
. The
measurement unit cover has to be opened carefully.
1. Loosen the four fastening screws of the cover plate, hex-socket,
size 5, and remove the cover with the air duct.
2. Loosen one hex-socket set screw, size 1.5 (see Figure 124 on page
217), and remove the main transmitter module from the optics unit.
Use an edge cutter to cut the cable tie carefully.
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