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VESDA by Xtralis
VESDA VLQ Product Guide
www.xtralis.com
25
4.3
Specify Backup Battery for Power Supply
In the event of a mains power supply disruption, the VLQ detector runs on a backup battery connected to the
external power supply. The size of the battery is determined by:
l
local codes and standards
l
the total power required by the system
l
back up time required
l
allowance for reduction in capacity with age
l
expected temperature variations
Note:
It is recommended that batteries connected to the external power supply be inspected and changed
as per manufacturer’s specifications or as per local codes and standards.
To facilitate the calculation of the backup battery size, a Battery Calculation Sheet is included below.
Table 4-2: Calculating the size of backup battery
Equipment
Normal loads @ 24 V DC
Full alarm load @ 24 V DC
Load mA
Qty
Total
Load mA
Qty
Total
Detector
170
190
Other 24V Loads
Total
mA
Total
mA
X
X
Standby Hours
Alarm Hours
=
Standby Capacity
Alarm Capacity
Total Capacity =
S Alarm
Divided by 1000 for
Standby Capacity
Multiply by battery
factor X1.25