Hach-Lange ORBISPHERE 510_51x Basic User Manual - Manual (Page 17)

Option Description
Hysteresis 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. For example, if the High Alarm
is set to 40 ppb and the Hysteresis is set to 10% then the High Alarm is activated once the
measurement reaches 40 ppb but only deactivated once it drops below 36 ppb. With the Low
Alarm the opposite is true in that if the Low Alarm is set to 20 ppb and the Hysteresis set to 10%
then the Low Alarm is activated when the measurement drops below 20 ppb and deactivated
when it rises above 22 ppb.
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.
Measurement filter configuration
The filters are aimed at “flattening” the measurement curve in situations where the process shows
atypical peak values that could otherwise hamper the interpretation of measurement readings. The
filter is applied on the last set of measurements each time a measurement is taken.
1. Select the Filter button on the Measurement configuration screen:
Option Description
State Set the filters to Enabled or Disabled.
Type If enabled set the filter to Mean or Median.
Mean is the mathematical average of the last set (depth) of measurement values.
Median allows for eliminating atypical peak measurement values and averaging the
remaining ones. The calculation sorts the last measurement set (depth) by values, then
ignores the highest and lowest values and averages the remaining values (central depth).
Depth Number of measurements that make up a set.
Central depth Number of measurements to be used to determine the average.
2. Example: With a depth of 7 and central depth of 5, the 7 values are sorted and the highest (7.0)
and lowest (0.9) eliminated. The average of the center 5 is calculated as 3.88:
0.9 1.1 4.0 4.3 4.4 5.6 7.0
Advanced configuration
1. EC sensor
Option Description
Enable pressure sensor Check as appropriate.
Enable negative concentration Check as appropriate.
TPO enable (portable instruments in Sample
mode measurement only) Check if TPO calculation is required.
TPA enable (portable instruments in Sample
mode measurement only) Check if TPA calculation is required.
TPA K coefficient If TPA is enabled, enter the TPA K coefficient if different
from the displayed value.
2. TC sensor
Option Description
Enable ext. pressure
sensor Check as appropriate.
English 17