13.5 Alarms
13.5.1 Fail Alarm is Triggered
1. Read the alarm message on the Hydran 201Ti’s display to identify the cause of
the alarm. Then see Section 13.1.
2. Verify the fuses and power supply of the Hydran 201Ci Controller and H201Ti.
3. Verify the connections of the TDM signal at both ends of the supervisory link
cable.
13.5.2 Fail Alarm Message Displayed in the Hydran Host Software
1. Display the on-line help of the alarm message window to identify the cause of the
alarm.
2. For the procedure, see Section 13.1.
13.5.3 Intermittent Gas Alarms are Occurring
1. Alarm set points are too low. Consult the Hydran 201Ti’s historic data files Short
Term and Long Term.
2. Compare the set points with the variations of gas level, hourly trend and daily
trend.
3. Verify the H201Ti’s gas alarm delays.
13.5.4 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; Section 5.5.7) of the Hydran
201Ti’s corresponding relay is set to Force ON or Force OFF.
3. The RelayMode parameter of the H201Ti’s corresponding relay is set to Latch.
The alarm must be acknowledged using the H201Ti’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 H201Ti’s Relays/Analog submenu.
13.5.5 Irregular Gas Readings
1. Ensure the valve (on which the Hydran 201Ti is installed) is fully open.
2. Confirm that the valve type is acceptable (full bore, gate or ball, no restriction
between valve and tank). See the recommendations in Section 6.1.
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