Hach Ultra ORBISPHERE 510, Руководство оператора

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48 of 138 Measurement Menu - Orbisphere 510/511/512 Analyzers
Operator Manual
ORBISPHERE
4.2.3 Measurement Alarms Configuration
Fig 4-2:
Alarms System Diagram
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.
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 sufficient to avoid alarms for non-
representative peaks beyond the set level.