ST100A Series Flow Meter OPERATION
Fluid Components International LLC 47
Flow Filtering
Use the configuration software to adjust flow filtering (Advanced Setup/Flow FIltering) as required for your application. Refer to the ST100A
Configuration Software manual 06EN003481 for software details. The Flow Filtering setup screen is shown in Figure 46 below. Two types
of flow filtering are available: Flow Output Damping and Flow Input Moving Average Filter.
Figure 46 – Flow Filtering Setup Screen
Flow Output Damping
The
flow meter has a flow damping setting that is used 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. Use the configurator software to
adjust the flow damping setting (Advanced Setup/User Parameters) as required for your application. Refer to the ST100A Series
Configuration Software manual 06EN003481 for details.
As shown in Figure 47 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 results in reduced flow response. Make sure that alarm conditions are not affected when
using the flow damping feature.
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