User's Guide ______________________________________________________________________  
140 _________________________________________________________________ M210667EN-C 
Finalizing Installation 
After all the installation steps have been proceeded and the fine-
alignment as well as the calibration have been carried out successfully, 
the LT31 system can be finally prepared for operational use. When the 
fastening screws for support units and measurement units are carefully 
fixed, the measurement head covers can be installed to LT31 receiver and 
transmitter. 
Mounting Measurement Head Cover 
When the measurement head cover is attached to the support unit, a 
special fast locking mechanism is utilized to secure the hood in its 
intended position using six lock screws. These screws are equipped with 
an ejector spring in order to achieve easy removal of the measurement 
head cover. The placement of the screws is indicated in Figure 95 below.  
 
 0904-025 
Figure 95  Lock-Screws at Measurement Head Cover 
The counterpart of the lock screws are part of the support unit and the 
lock screws can be fastened by a quarter turn using a suitable 
screwdriver. One of the receptacles inside the measurement head cover is 
shown in Figure 96 below. 
 
0905-016  
Figure 96  Receptacle Inside the Measurement Head Cover