8.4 Alarms
8.4.1 Intermittent Gas Alarms
1. Alarm set points are too low. Consult the Hydran M2-X’s Short Term and Long
Term history files, and compare the set points with the variations of gas level,
hourly trend and daily trend.
2. Verify the Hydran M2-X’s gas alarm delays.
8.4.2 An Alarm Relay does not Reset, even if the Alarm Condition has
Disappeared
1. The corresponding alarm delay has not yet expired.
2. The RelayMode parameter (Relays/Analog submenu; see Section 3.2.3) of the
Hydran M2-X’s corresponding relay is set to Force On or Force Off.
3. The RelayMode parameter of the Hydran M2-X’s corresponding relay is set to
Latch: the alarm must be acknowledged using the Hydran M2-X’s keypad (and
the alarm condition must have disappeared) to cancel the alarm.
4. Verify the relay’s contacts and the circuit by setting the corresponding
RelayMode parameter to Force On and Force Off in the Hydran M2-X’s
Relays/Analog submenu.
8.4.3 Irregular Gas Readings
1. Ensure the valve (on which the Hydran M2-X is installed) is fully open.
2. Confirm the valve type is acceptable (full bore, gate or ball, no restriction
between valve and tank).
3. Verify the sensor’s serial number and parameters in the Hydran M2-X’s
Service;SensorCal Data submenu (see Section 3.6.1.1).
4. Execute the Hydran M2-X’s Force Sensor Test command (Relays/Analog
submenu) to test sensor operation.
5. Verify the value of the HourlyTr Period parameter (period of the hourly trend;
Gas;HourlyTrend submenu).
6. Verify the value of the DailyTr Period parameter (period of the daily trend;
Gas;DailyTrend submenu).
7. Verify the value of the Period B parameter (Temperature;DynOil Sampl
submenu).
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