Table of Contents
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Measurement Configuration (TC Sensor)
The measurement configuration for a TC sensor
is same as for an EC sensor with the addition of
one extra selection criteria:
Purge gas: From the drop-down list, select the
purge gas being used for the TC sensor.
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 levels. 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. The filter is applied on
the last set of measurements each time a
measurement is taken.
Example for depth 7, central depth 5:
Sorted values, both ends eliminated, the average
of the center five is then 3.88.
Example for depth 5, central depth 3:
Sorted values, both ends eliminated, the average
of the center three is then 4.23.
Example for depth 8, central depth 4:
Sorted values, both ends eliminated, the average
of the center four is then 4.43.
0.7
•
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)
0.7
1.1
4.0
4.3
1.1
4.0
4.3
1.1
4.0
4.3
4.4
5.6
7.0
4.4
5.6
4.4
5
5.6
7.0
Page 5
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