Zenner PDC Manual De Montaje Y Operacion página 14

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9. Smart Meter functions
Self-monitoring:
The module has an integrated battery status
monitoring.
Leakage detection:
If over a period of 24 hours (96 quarter hour
values) the flow value is never zero, then this
indicates a leak. The PDC module sets corre-
sponding bits.
Is the flow rate remains zero during one quar-
ter of an hour (before reaching 96 quarters of an
hour with no flow), the algorithm restarts.
If 96 quarters of an hour were running with flow,
leakage remains set until during 8 quarters of an
hour in a row the flow remains zero. The event
memory stores the date and time of the event.
Meter stop detection (blockade)
If no meter progress will be detected by the PDC
module over a period of 4 weeks, meter stop
(blockade) is detected.
The blockade deemed to be revoked if a meter
reading difference of > 10 liters occurs in a quar-
ter of an hour.
Meter oversized detection
Meter is oversized when the flow never exceed
0.1 * Q3 (10% of Q3).
This is averaged over a 15-minute period. It is
counted how many times the flow rate of 10% of
Q3 is not achieved. If the flow rate is not reached
after 30 days, "meter oversized" is detected.
If once a flow rate of> 10% from Q3, averaged
is reached by a quarter of an hour, the detection
is permanently disabled and the status "meter
oversized" deleted. The algorithm can be restart-
ed via optical head.
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Undersized detection counter
If the flow rate is continuously higher as Q3
(permanent flow) over a 6-hour period, this
indicates an undersizing of the meter and the
message "meter undersized" will be detected.
This is averaged over a 15 minute period.
In the event store date and time of the event are
stored.
Pipe burst detection
For PDC-M-Bus: "Pipe burst" is detected when
the flow rate has exceeded a given value (>30%
of Q3) during a 30-minute period. This is aver-
aged over a 15-minute period.
In the event store date and time of the event are
stored.
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