Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 209
14. Re-install the measurement head cover and lock it carefully.
15. Close the interface unit and mount the upper interface unit cover
after fine alignment and calibration is finalized.
Replacing Transmitter Optics Unit
LTO112
NOTE
To replace the complete receiver optics unit, the receiver 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.
To remove the complete 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 air duct. See Figure 72 on page
115.
2. To remove the optics unit, two fastening screws (hex-socket size 3)
and one fastening bolt (socket wrench, size 7) have to be loosened.
See Figure 121 on page 210.
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