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Alarms
The IWM-LR3 - IWM-LR4 LoRa module have several alarm functions built in.
When an alarm is detected the corresponding alarm flag in the status data is set. When an alarm flag is set the
status data is included in every report.
The alarm flag can be reset manually using a Downlink command or via NFC.
MAGNETIC ALARM
If a magnetic field is detected for 10 minutes, the magnetic alarm is triggered.
REMOVAL ALARM
It occurs when there is a condition of three uncovered coils at the same time (=module was dismounted from
the meter).
SENSOR FRAUD ALARM
Occurs when there is a condition of three coils simultaneously covered or transitions of state not allowed
(=foreign object is obstructing the rotating index/coils communication).
LEAKAGE ALARM
If the passage of minimum 3 liters in an houd is detected (for K = 1) or 10 liters in an hour (for K = 10) or 100
liters in an hour (for K = 100), the alarm is recorded for a number of consecutive hours equal to 12.
If the leakage is considered resolved (=the flow stops), the loss alarm is reset.
REVERSE FLOW ALARM
It occurs when there is a condition of reverse flow passage of more than 20 liters.
LOW BATTERY ALARM
The battery alarm is set when the battery voltage, measured at the end of a radio transmission, is lower than
the threshold set in EEPROM (Low Battery Threshold). For the alarm to be activated, the measurement must be
less than the threshold for 5 consecutive measurements.
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IWM-LR3 - IWM-LR4
User Manual v1.0
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