PPD Maintenance Manual
T1DA0502-002, Rev A
Page 22
A) Operating
Temperature
Low temperatures will decrease battery output voltage and, as a result, shorten the battery life. It
may be observed that a unit operates correctly indoors (at room temperature), but will experience
sufficient voltage drop when used outdoors (in winter cold environment) to activate the
automatic low battery detection transmission. If this occurs, take the unit out of service
immediately.
[NOTE: Senstar PPD transmitters have been independently tested and shown to achieve over
3,000 transmissions at -40 degrees Celsius before the low battery threshold was observed].
B) Number
of
Activations
Every time the transmitter is activated, it draws 110 mA for a short period. This consumes
battery capacity. Under ideal conditions (with a new battery at room temperature), independent
tests have shown the PPD transmitter to achieve over 30,000 transmissions.
C)
Optional Features (Man-Down Module)
The man-down feature reduces battery life due to the increased standby current drain of the
additional electronics and due to the fact that the unit will "wake up" every time it is tilted and
enters audible alert and transmit timing mode. The number of times the unit is tilted is
completely variable so a battery life specification is difficult to define. The battery life is defined
as follows for a PPD with the Man-Down Module option:
One year of continuous operation at room temperature assuming no manual activations or
automatic activations (due to tilt) during the year. Following the one year under these conditions,
the unit will be capable of automatically activating due to a tilt or manually activating using the
pushbutton.
D)
Hours of Standby Operation
The standard transmitter (no options) consumes a steady current drain of about 16 microamperes.
At this rate, the PPD consumes 25% of the battery capacity just by having the battery installed in
the unit. Furthermore, commercial alkaline batteries typically degrade 10% to 15% per year (this
is the so called 'shelf life' effect on battery capacity). If the PPD is to be stored for a long period
remove the battery or expect to replace the battery before putting that PPD back in service.
The man-down option causes the standby current of the transmitter to increase to 50
microamperes nominally. One year of standby operation will effectively consume the battery
capacity of a 9 Volt alkaline cell.
7.3.3 Battery
Replacement
When a PPD has detected and transmitted the battery low condition it must be removed from
service and the battery replaced. If the battery is replaced as part of a maintenance schedule this
procedure also applies. Follow the battery removal procedure in section 4.3. Carefully unsnap the
battery clip and set the old battery aside. Connect the new battery to the clip and install following
the procedure in section 4.7.