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 />
ensures that the both conditions must be present, or TRUE, for<br />
the equation to be satisfied.<br />
See also:<br />
• Logical operators in equations on page 99<br />
• Parentheses and order of execution on page 97<br />
Condition Builder<br />
Threshold<br />
Condition<br />
Use the Condition Builder window to define conditions for<br />
equations.<br />
To define a condition, choose the type of condition from the<br />
options in the top half of the window. Then, specify the<br />
parameters for that condition. Click OK to save the condition and<br />
return to the Equation Builder window.<br />
There several types of conditions:<br />
• Threshold<br />
• Sensor Error<br />
• Rate of Change<br />
• Time Table<br />
• Range<br />
• Rain Event<br />
Note: To remove a previously defined condition, choose “None” as<br />
the condition type.<br />
Threshold conditions are TRUE when a measured reading<br />
reaches or exceeds your defined set point.<br />
An example of a threshold condition would read “When 2150<br />
Area Velocity::Level is greater than or equal to 3.0 feet.”<br />
To define the threshold condition:<br />
1. Select a measured data type from the “When” drop-down<br />
list.<br />
2. Select a comparison operator.<br />
• < (less than)<br />
• > (greater than)<br />
• = (greater than or equal to)<br />
3. Enter the threshold point. The units of measure were<br />
automatically assigned when the data type was chosen.<br />
4. Enter a hysteresis and time duration.<br />
Combined, the hysteresis and time duration prevent<br />
occurrences of the condition repeatedly toggling between<br />
TRUE and FALSE if the measured parameter hovers<br />
near the threshold. Likewise, the duration can prevent<br />
the condition from changing states due to a single<br />
anomalous measurement.<br />
A hysteresis is a tolerance for variances in the measured<br />
data. For example, if a level condition is set for three feet<br />
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