Siemens SITRANS FUE1010 IP40 NEMA 1 Guide Rapide page 16

Installation
2.1 Application Guidelines
Status
Battery Warning Beeper
Battery Discharge
14
Indication
Normal operation, periodic audible alarm
Unit will not turn on (no display screen)
Action
Connect a Battery Charger for
continued operation.
Connect to Battery Charger for at least
1.5 hours before attempting to operate.
FUE1010 IP40 (NEMA 1) Energy Portable
Compact Operating Instructions, 5/2009, A5E02384186-03