Flowlink 5.1 Software Instruction Manual - Isco

Isco Flowlink 5.1 ® Software
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Defining a
Condition
Threshold Condition
Rate of Change
Conditions
To define a condition:
1. From the equation view box at the top of the Equation
Builder window, select a condition (A, B, C, or D) to
define. The lower portion of the window will list the
conditions that can be selected to build the equation.
2. Select one of the four Condition types, Threshold, Rate of
Change, Time Table, or Rain Event, and complete the
remaining entries at the bottom of the window. Note: The
“None” option defines the condition as “not used.”
3. Click Accept. The condition is defined and ready for use
in an equation.
Threshold conditions are satisfied when a measured reading
reaches or exceeds your defined set point. Threshold conditions
require three entries - a data type, a comparison operator, and a
set point. An example of a threshold condition would read “When
Level is greater than or equal to 3.0 feet.”
To define the threshold:
1. Select a data type from the pull-down list.
2. Select either the =
(greater than or equal to) comparison operator.
3. Enter the set point. The units of measure were
automatically assigned when the data type was chosen.
4. Click Accept. The threshold is defined and ready for use
in an equation.
Rate-of-change conditions are satisfied when a range of readings
exceeds a point within a specified duration. A rate of change
allows you to trigger functions based on significant or sudden
events while ignoring subtle changes in reading values.
Rate of Change conditions require three entries - a data type, an
amount of change, and duration.
A good example of a rate of change condition would be to use
measured rainfall to enable a sampler for a rain event. You may
want to collect samples only if you received 0.25 inches of rain in
a one-hour time span. That is, the sampler would stay disabled
until a significant rainfall event occurred. This type of condition
would read “When Rainfall changes by 0.25 inches or more for 1
hour.”
To define the rate of change:
1. Select a data type from the pull-down list.
2. Enter the amount of change. The units of measure were
automatically assigned when the data type was chosen.
3. Select a period of time from the pull-down list.
4. Click Accept. The rate is defined and ready for use in an
equation.
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