This is an over-riding low pressure setting that gives overall protection
against a major breach in the system that may have occurred between
irrigation cycles. This would be set just below what would be the lowest
operating pressure expected anywhere in the system.
If the pressure drops below, or never achieves this setting, the IPG20 will
shut down the system and display “pressure too low”.
This is the pressure allowed above the set point. If the operating pressure is
not expected to change on any given “run” then this margin can be set very
close to the set point but allow for small pressure fluctuations which can be
present. This setting can be used to detect a partial blockage.
This is the pressure allowed below the operating set point. If the operating
pressure is not expected to change on any given “run” then this margin can
be set very close to the set point but allow for small pressure fluctuations
which can be present. This setting will detect a leak in the system that drops
the pressure below the low pressure margin.
This would normally be set at the highest expected pressure anywhere in
the system or perhaps at the maximum pressure rating of the pipeline.
The absolute high limit is the maximum pressure you want the system to
reach before shutting down. The range of adjustment is 0 to 2000kPa. The
high pressure trip point must be set to some value higher than the low
pressure trip point. If you try to set the high-pressure trip to a lower value
than the low pressure trip point the IPG20 will not accept the setting and
advise you to check your settings. If you choose to leave the high pressure
trip point set at zero, meaning you don’t want an upper pressure limit, then
the IPG20 will automatically set it for you to 2000kPa which is the
maximum pressure the IPG20 itself can continuously tolerate. When the
absolute high limit is reached any other settings will be over-ridden and
the system will be shut down immediately.
ABSOLUTE HIGH LIMIT
ABSOLUTE LOW LIMIT
LOW PRESSURE MARGIN
HIGH PRESSURE MARGIN
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