HYDROMETER GPRS Receiver Battery Mode D'emploi page 9

Since the GPRS Receiver Battery is getting all its operating power only from the
lithium battery pack, it is not possible to enable the radio receiver permanently.
Therefore, the user configures the GPRS Receiver Battery to enable the radio
reception in fixed intervals of time for a certain duration. The radio telegrams
received during this time are stored internally. For each consumption meter only the
first received radio telegram at each reception is stored. Additionally received radio
telegrams of one meter at one reception are discarded.
Also at configurable points of time the stored radio telegrams, which have not already
been transmitted, are sent to the FTP server.
The maximum life time of the battery pack depends especially on these three
parameters: frequency of the radio reception (e.g. once per hour, every 6 hours etc.),
duration of the radio reception (e.g. 45 seconds, 90 seconds etc.) and the number of
FTP data uploads per month (e.g. once per day, every 7 days etc.).
The frequency of the radio reception gives the timely resolution of the consumption
values.
The duration of the radio reception should be adapted to the radio emission interval
of the radio consumption meters. In general it is advised to use a 5 times longer radio
reception interval than the radio emission interval to have an adequate security
margin (example: radio consumption meters are sending every 8 seconds Æ GPRS
Receiver Battery radio reception duration > 40 seconds).
GPRS Receiver Battery 9