7.1.3.1 Method Drawbacks
The analog outputs monitoring has the following disadvantages:
• Analog outputs are generally sensitive to electric noise. Care must be
taken in cable installation and data interpretation.
• Each Hydran M2-X output must be cabled individually.
• Analog outputs carry only one type of information in only one direction:
the gas or moisture level in oil.
• The Hydran M2-X trend computation and alarms are not available.
7.1.4 Combined Alarm and Analog Outputs Monitoring
As the name implies, this method combines the two previous monitoring
methods:
• Although all alarms are now available at the same time, important
information is still confined to the Hydran M2-X.
• Accessing the Hydran M2-X is still required to modify operation
parameters.
• The amount of cabling required is high. For each Hydran M2-X, a
minimum of seven pairs of wires is required to connect the analog outputs
and the four sets of alarm contacts. To receive this information, four
digital inputs and two analog inputs must be available in the SCADA
system for each Hydran M2-X.
7.1.5 Local Monitoring With a Laptop Computer
The local monitoring with a laptop computer method consists of connecting a
laptop computer running the Perception software to a Hydran M2-X using the local
RS-232 serial communication link.
The Perception software performs numerous tasks, among which:
• Data reading (gas and moisture level, hourly and daily trends, etc.)
• Immediate detection of all alarms and their acknowledgment by the user
• Modification of alarm settings and other parameters
• History data upload and reading from one or several Hydran M2-X’s
• Visualization of readings from up to four external sensors (optional)
For details, see the Perception Software Manual.
Note: Other software can be run on the laptop computer at the same time as the
Perception software.
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