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Hydran* 201i Instruction Manual
12.1.2 Alarm Monitoring
The alarm monitoring method solves the disadvantages of the periodic, visual monitoring
method as follows:
• Connecting the alarm contacts to an alarm panel (or any other SCADA system)
located in the station's control room.
• Continuous alarm monitoring.
• Periodic, visual reading (weekly) of the gas level on the display of the Hydran
201Ti's or the Hydran 201Ci-1. For details on the various methods of data
reading, see Section 12.2.
• Manual logging of the gas level readings.
For details on the alarms and relays operation, see Chapter 11.
1.1.1.13 Method Drawbacks
The alarm monitoring method solves the response time inadequacy of the periodic,
visual monitoring method (Section 12.1.1above), but does not provide any information to
anticipate and prevent alarms.
Moreover, no information is available to immediately evaluate the severity of this
alarm. For example, a rapid gas level increase and a daily trend increase trigger the
same alarm. These two alarm conditions, however, do not have the same importance.
12.1.3 Analog Output Monitoring
The analog output monitoring (gas level monitoring via the analog output) solves the
disadvantages of the alarm monitoring method (Section 12.1.2) as follows:
• Connecting the analog output to a SCADA system. The Hydran 201T i and the
Hydran 201Ci-1 both have analog outputs that allow to monitor the gas level
evolution.
• Using a SCADA system to generate alarms based on the collected data.
• Periodic, visual reading (weekly) of the gas level on the display of the H201Ti's
or the H201Ci-1. For details on the various methods of data reading, see
Section 12.2.
It is recommended to use a SCADA system that offers the following advantages:
• Gas level reading from the control room.
• Regular processing data analysis.
• Detection of gas and fail alarms when the specified alarm conditions are
present.
application's needs.
• Safe storage of historic data in a format that allows easy analysis from a host
computer.
MA-033
Rev. 14.0, 12-Nov-18
The system's response time must be short enough for the
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