Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
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<strong>Isco</strong> <strong>Flowlink</strong> <strong>5.1</strong> ® <strong>Software</strong><br />
Site Window - 2100<br />
or greater and the level measurements vary slightly<br />
between 2.99 and 3.01 ft, the state of the condition would<br />
change each time this narrow range of readings crosses<br />
the threshold point. Adding a hysteresis of 0.1 would<br />
mean that once the condition is true at 3.0 feet, the level<br />
must fall to 2.9 feet before the condition would be false.<br />
The duration setting requires all of the readings for the<br />
time duration to reach or exceed the threshold before the<br />
condition is met.<br />
5. Click OK. The threshold condition is defined and ready<br />
for use in an equation.<br />
Sensor Error<br />
Rate of Change<br />
Sensor Error conditions are TRUE when a sensor error exists for<br />
a specified duration.<br />
An example of a Sensor Error condition would read “When 2150<br />
Area Velocity::Velocity is in error for 30 minutes.”<br />
To define the Sensor Error condition:<br />
1. Select a measured data type from the “When” drop-down<br />
list.<br />
2. Select a duration from the “is in error for” drop-down list.<br />
3. Click OK. The Sensor Error condition is defined and<br />
ready for use in an equation.<br />
Rate of Change conditions are TRUE when a measured<br />
parameter changes by a specified degree over a duration of time.<br />
An example of a Rate of Change condition would read “When<br />
2150 Area Velocity::Velocity decreases more than 2 f/s in a<br />
15 minute period.”<br />
To define the Rate of Change condition:<br />
1. Select a measured data type from the “When” drop-down<br />
list.<br />
2. Select increases or decreases from the drop-down list.<br />
3. Type a value in the “more than” box. The units of<br />
measure were automatically assigned when the data type<br />
was chosen.<br />
4. Select a time period from the drop-down list.<br />
5. Enter a Hysteresis value.<br />
The hysteresis prevents the condition state repeatedly<br />
toggling between TRUE and FALSE if the rate of change<br />
hovers near the set values.<br />
Time Table<br />
Conditions<br />
Time table conditions are TRUE when the instrument’s internal<br />
clock is within the defined duration of time.<br />
An example of a Daily Time table condition would read “starting<br />
Daily at 08:00:00, stopping Daily at 17:00:00.”<br />
To define the time table:<br />
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