UMG70XV3-4EN 12.01.2009 109
12 Advanced Measuring Functions
12.4 Cut-off Flow
The cut-off flow function automatically sets all measured flow velocities to zero that are
below a preset value. All values derived from this measured value will also be set to zero.
The cut-off flow can depend on the flow direction or not. The cut-off value will be set in
SPECIAL FUNCTION\SYSTEM SETTINGS\MEASURING\CUT-OFF FLOW.
If CUT-OFF FLOW\SIGN and USER are selected, two values have to be entered:
If CUT-OFF FLOW\ABSOLUT and USER is selected, only one value has to be entered:
Select SIGN to define a cut-off flow dependent on the
flow direction. There are two independent limits to be set
for the positive and negative flow directions.
Select ABSOLUTE to define a cut-off flow independent of
the flow direction. There is only one limit to be set. The
absolute value of the measured value will be compared
to the cut-off flow.
Press ENTER.
Select FACTORY to use the default limit of 2.5 cm/s
(0.025 m/s) for the cut-off flow.
Select USER to enter the cut-off flow.
Press ENTER.
Enter the cut-off flow for positive measured values. All
positive values of the flow velocity less than this limit, will
be set to zero.
Enter the cut-off flow for negative measured values. All
negative values of the flow velocity greater than this limit,
will be set to zero.
The limit will be compared to the absolute value of the
measured flow velocity.
Cut-off Flow
absolut >SIGN<
Cut-off Flow
factory >USER<
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