User's Manual

RTM Elster AMCO applicative PFS Coronis Systems
5.10.Low Battery Warning detection
(Refer to DR[3] Section 1.0.28)
To detect a “Low Battery Warning”, RTM Elster AMCO uses power metering principle rather than battery
voltage measurement. Lithium batteries are, in particular during passivation, unsuitable for the voltage
measurement method to determine the remaining capacity.
RTM Elster AMCO records and evaluates all occurrences (measurements, radio emissions and
receptions, ...) to decrement the power meter according to the battery used. When the meter passes below a
predefined threshold, the “Low Battery Warning” is pointed out through bit 0 in “Application Status”
parameter. The threshold is factory-set and indicates that remaining battery capacity is about 10% of the
practical capacity (60% of the theoretical one) depending on product usage (number of emissions per day,
output power,...).
The initial value of the end-of-life meter is factory-set. It depends on the type and number of batteries used.
When the end of battery life is detected, the detection date is recorded and may be read with a radio
command.
Some occurrence counters useful for “Low Battery Warning” calculation are stored in non-volatile memory.
These counters are accessible through a radio request.
List of accessible counters :
 Number of radio transmissions,
 Number of radio receptions.
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