Flowlink 5.1 Software Instruction Manual - Isco

Isco Flowlink 5.1 ® Software
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or greater and the level measurements vary slightly
between 2.99 and 3.01 ft, the state of the condition would
change each time this narrow range of readings crosses
the threshold point. Adding a hysteresis of 0.1 would
mean that once the condition is true at 3.0 feet, the level
must fall to 2.9 feet before the condition would be false.
The duration setting requires all of the readings for the
time duration to reach or exceed the threshold before the
condition is met.
5. Click OK. The threshold condition is defined and ready
for use in an equation.
Sensor Error
Rate of Change
Sensor Error conditions are TRUE when a sensor error exists for
a specified duration.
An example of a Sensor Error condition would read “When 2150
Area Velocity::Velocity is in error for 30 minutes.”
To define the Sensor Error condition:
1. Select a measured data type from the “When” drop-down
list.
2. Select a duration from the “is in error for” drop-down list.
3. Click OK. The Sensor Error condition is defined and
ready for use in an equation.
Rate of Change conditions are TRUE when a measured
parameter changes by a specified degree over a duration of time.
An example of a Rate of Change condition would read “When
2150 Area Velocity::Velocity decreases more than 2 f/s in a
15 minute period.”
To define the Rate of Change condition:
1. Select a measured data type from the “When” drop-down
list.
2. Select increases or decreases from the drop-down list.
3. Type a value in the “more than” box. The units of
measure were automatically assigned when the data type
was chosen.
4. Select a time period from the drop-down list.
5. Enter a Hysteresis value.
The hysteresis prevents the condition state repeatedly
toggling between TRUE and FALSE if the rate of change
hovers near the set values.
Time Table
Conditions
Time table conditions are TRUE when the instrument’s internal
clock is within the defined duration of time.
An example of a Daily Time table condition would read “starting
Daily at 08:00:00, stopping Daily at 17:00:00.”
To define the time table:
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