Chapter 3 ______________________________________________________ Functional Description 
VAISALA _______________________________________________________________________ 65 
 
 0810-074 
Figure 31  Installed Backup Battery 
The DC switch is used to interrupt the battery-based power supply for 
storage, transportation, and maintenance of the instrument. 
CAUTION 
Do not short circuit the battery. 
 
NOTE 
A valve-regulated lead battery is used for the battery backup. According 
to the ISO 14001, the battery must be recycled.