108 UMG70XV3-4EN 12.01.2009
12 Advanced Measuring Functions
12.3 Upper Limit of the Flow Velocity
Single outliers caused by heavily disturbed surroundings can appear in the measured
values of the flow velocity. If outliers are not ignored, they will affect all derived physical
quantities, which will then be unsuitable for integration (e.g. pulse outputs).
It is possible to ignore all measured flow velocities higher than a preset upper limit. These
measured values will be marked as outliers.
The upper limit of the flow velocity will be set in SPECIAL FUNCTION\SYSTEM SET-
TINGS\MEASURING\VELOCITY LIMIT.
If the flow velocity is higher than the upper limit,
• the flow velocity will be marked as invalid. The physical quantity can not be deter-
mined.
• the LED of the measuring channel lights red (FLUXUS G709)
• "!" will be displayed after the unit of measurement (in case of a normal error, "?" is dis-
played)
Note! The overflow of a totalizer influences all output channels, e.g. data
memory, online output.
The output of the sum of both totalizers (the throughput Q) via an
output will not be valid after the first overflow (wrapping) of one of
the corresponding totalizers.
To signalize the overflow of a totalizer, an alarm output with switching
condition QUANTITY and type HOLD has to be activated.
Enter 0 (zero) to switch off the detection for outliers.
Enter a limit > 0 to switch on the detection for outliers.
The measured flow velocity will be compared then to the
entered upper limit.
Press ENTER.
Note! If the upper limit is too low, a measurement might be impossible, as
most of the measured values will be marked "invalid".
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