User's Guide ______________________________________________________________________
222 _________________________________________________________________ M210667EN-C
CAUTION
After any movement of the measurement unit, fine alignment and
calibration must be carried out to establish normal operational
conditions. For details, see sections Fine Alignment on page 231 and
Calibration on page 232.
15. Re-install the measurement head cover and lock it carefully.
16. Close the interface unit and mount the upper interface unit cover
after exchange, fine alignment and calibration is finalized.
Replacing Battery in Case of Optional
LTBB111
In case of the optional battery backup LTBB111, a battery loader module
QBR101 and a 2 Ah battery are located inside the interface units of the
LT31 receiver and transmitter. After approximately 5 years of operation,
the battery should be replaced to ensure a safe backup operation in case
of an AC power break-down.
1.
Remove the upper interface unit enclosure and open the interface
unit with the provided key.
NOTE
Switch the AC switch off and also the battery backup switch off, before
you proceed with the next steps. See Figure 40 on page 83.
2.
Open the four screws holding the cover plate for the battery and
remove it. See Figure 127 on page 223.