OPERATION ST80/ST80L Flow Meter
36 Fluid Components International LLC
Flow Filtering
Use the configuration software to adjust flow filtering (Advanced Setup/Flow FIltering) as required for your application. Refer to the
ST80/ST80L Configuration Software manual 06EN003491 for software details. The Flow Filtering setup screen is shown in Figure 38
below. Two types of flow filtering are available: Flow Output Damping and Flow Input Moving Average Filter.
Figure 38 – Flow Filtering Setup Screen
Flow Output Damping
Use the Flow Output Damping field to smooth out the flow signal output for applications in which process conditions are erratic or for
applications using the more sensitive AST (Adaptive Sensing Technology) configuration.
As shown in Figure 39 below, an increase in flow damping value results in an output that is increasingly resistant to change (amplitude
variations). Compare the chart’s blue curve (value = 0.25 for 0% flow damping) with the chart’s black curve (value = 5.00 for 95% flow
damping). The black curve shows signal excursions that are much more constrained relative to the blue curve.
The minimum value that can be entered is 0.25 (0% flow damping). It is possible to enter a number greater than 5.0 (95% flow damping).
The practical limit, however, is 5.0 since 100% flow damping will never be attained regardless of the entered value.
High flow damping values result in reduced flow response. Make sure that alarm conditions are not affected when
using the flow damping feature.
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