Hach ORBISPHERE 410 Quick Operator's Manual page 5

Measurement Alarms Configuration
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 in % of above set values. The
hysteresis is used to prevent relay
"flickering" when the measurement is just
at the alarm level. Set this to a minimum,
but enough to eliminate flickering
• Delay in seconds before alarms go on
whenever concentration values are
above "High alarms" or below "Low
alarms". Set this to a minimum, but
enough to avoid alarms for non
representative peaks beyond the set
level.
Measurement (cont)
Measurement Filter Configuration
T h e f i l t e r s a r e a i m e d a t " f l a t t e n i n g " t h e
measurement curve in situations where the
process shows atypical peak values that could
o t h e r w i s e h a m p e r t h e i n t e r p r e t a t i o n o f
measurement readings.
T h e f i l t e r i s a p p l i e d o n t h e l a s t s e t o f
measurements each time a measurement is
taken.
Advanced Configuration
• Mean: Mathematical average of the last
set (depth) of measurement values.
• Median filter: Allows for eliminating
atypical peak measurement values, and
averages the remaining ones. The
calculation sorts the last measurements
set (depth) by values, then deletes the
highest and lowest values, and averages
the remaining values (central depth)
• Enable negative concentration: Check as
appropriate
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