Measurement Alarms Configuration - Hach ORBISPHERE G1100 User Manual

6.2.2 Measurement alarms configuration

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Low-low: 2nd stage for too low concentration
Low: 1st stage for too low concentration
High: 1st stage for too high concentration
High-high: 2nd stage for too high concentration
Hysteresis: A percentage of the above concentration values. The hysteresis is used to
prevent relay "flickering" when the measurement is just at the alarm levels. Set this to a
minimum, but enough to eliminate flickering.
As an example, if the High Alarm is set to 40 units and the Hysteresis is set to 10%, then
the High Alarm is activated once the measurement reaches 40 units, but only deactivated
once the measurement drops below 36 units. With the Low Alarm the opposite is true, in
that if the Low Alarm is set to 20 units and the Hysteresis set to 10%, then the Low Alarm is
activated when the measurement drops below 20 units, and deactivated when the
measurement rises above 22 units.
Delay: The delay in seconds, before alarms go on whenever concentration values go
above "High alarms" or below "Low alarms". Set this to a minimum value, but enough to
avoid alarms for non-representative peaks beyond the set level.
Set the thresholds for the low/high concentration levels,
according to the application. Each alarm type can be
individually enabled or disabled without losing its settings.
These events can activate the relays and can be displayed.
Figure 33 Alarms system diagram
Measurement Menu
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