Page 121Hydran* M2-X Instruction ManualMA-029 Rev. 1.0, 30-Jul-187.1.2 Alarm MonitoringThe alarm monitoring method solves the disadvantages of the periodic, visualmonitoring method as follows:• Connecting the alarm contacts to an alarm panel (or any other SCADAsystem) located in the station’s control room.• Continuous alarm monitoring.• Visual, periodic (weekly) reading of the gas and moisture levels on the displayof the Hydran M2-X’s (for details, see Section 7.2).• Manual logging of gas level readings.For details on the alarms and relays operation, see Chapter 6.7.1.2.1 Method DrawbacksThe alarm monitoring method solves the response time inadequacy of theperiodic, visual monitoring method, but does not provide any information toanticipate and prevent alarms.Moreover, there is no information immediately available for an evaluation of theseverity of this alarm. A site inspection is required to perform the alarm evaluation.7.1.3 Analog Outputs MonitoringThe analog outputs monitoring (gas and moisture level monitoring via the analogoutput) solves the disadvantages of the alarm monitoring method as follows:• Connecting the Hydran M2-X’s optional analog outputs to a SCADA system.The Hydran M2-X has analog outputs that allow you to monitor the gas andmoisture level evolution.• Using a SCADA system to generate alarms based on the collected data.• Visual, periodic (weekly) reading of the gas and moisture levels on the displayof the Hydran M2-X’s (for details, see Section 7.2).It is recommended to use a SCADA system that offers the following advantages:• Gas and moisture level readings from the control room.• Regular processing data analysis.• Detection of any alarm when the specified alarm conditions are present. Thesystem’s response time must be short enough for the application’s needs.• Safe storage of the history files data in a format that allows easy analysisfrom a host computer.
