MADDALENA ElecTo SONIC, Instructions For Installation, Use And Maintenance Manual

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8
1.8 Alarms
ElecTo SONIC is able to detect, store, and
transmit the following alarms via radio:
Alarm Description
Possible
status Default
Suspect-
ed leak
Continuous flow
rate detected
ON/OFF ON
Backflow
Reverse flow
rate for a preset
threshold
ON/OFF ON
Over-con-
sumption
Flow rate exceeds
a threshold for a
preset period
ON/OFF OFF
No con-
sumption
The meter detects
no consumption for
a preset period
ON/OFF ON
Reversed
meter
Constant negative
consumption for
more than 10 days
ON/OFF ON
Ice
The meter receives
no ultrasonic
signal and the
temperature
is below the
minimum threshold
Always
ON
ON
Empty
tube/air
The tube is
empty or the
transducers
do not receive
the ultrasonic
signal (possible
damaged
transducer)
Always
ON
ON
Low/high
water
tempera-
ture
The meter is
operating outside
envisaged
temperature limits
Always
ON
ON
Verifi-
cation
period
expiry
The meter has
exceeded the
verification
period
ON/OFF OFF
Low
battery
voltage
Battery voltage is
too low
Always
ON
ON
Low
battery
charge
Battery is flat ON/OFF ON
Metro-
logical
check-
sum error
The firmware
(flash memory) is
corrupted
Always
ON
ON
1.8.1 Alarm transmission (LoRaWAN mode)
– if an alarm condition occurs and the frame
has not yet been sent in the current win-
dow, it is sent early;
– if an alarm condition occurs and the frame
has already been sent in the current win-
dow, an event frame is sent.