16 Advanced functions
16.2 Upper limit of the flow velocity
FLUXUS G809
2020-06-25, UMFLUXUS_G809V2-2EN
134
Totalizer overflow
The overflow behavior of the totalizers can be set:
• Select
Special Funct.\SYSTEM settings\Measuring\Quant. wrapping
.
• Select
on
to work with overflow.
The flow totalizer will be reset to zero automatically when ±9999999999 is reached.
• Select
off
to work without overflow.
The value of the totalizer increases to the internal limit of 10
38
. The values will be displayed as exponential numbers
(±1.00000E10), if necessary. The flow totalizer can only be reset to zero manually.
• Press ENTER.
Independent of the setting, the flow totalizers can be reset to zero manually.
16.2
Upper limit of the flow velocity
Single outliers caused by heavily disturbed surroundings can appear among the measured values of the flow velocity. If
these outliers are not ignored, they will affect all derived physical quantities, which will be unsuitable for the integration
(e.g., pulse outputs).
It is possible to ignore all measured flow velocities exceeding the preset upper limit. These measured values will be
marked as outliers.
The upper limit of the flow velocity is set in
Special Funct.\SYSTEM settings\Measuring\Velocity limit
.
• Enter zero to switch off the outliers check.
• Enter a limit > 0 to switch on the outliers check. The measured flow velocity will then be compared to the entered upper
limit.
• Press ENTER.
If the flow velocity is higher than the upper limit,
• the flow velocity will be marked as invalid. The physical quantity cannot be determined.
• the LED of the measuring channel will light red
• a (
!
) will be displayed after the unit of measurement (in case of a normal error (
?
) is displayed).
Special Funct.\SYSTEM settings\Measuring\Quant. wrapping
Notice!
The overflow of a totalizer influences all output channels, e.g., data logger, online transmission of data.
The output sum of both totalizers (throughput
Q
) transmitted via an output is not valid after the first overflow (wrap
-
ping) of one of the totalizers.
In order to signalize the overflow of a totalizer, an alarm output with the switching condition
QUANT.
and the type
HOLD
has to be activated.
Special Funct.\SYSTEM settings\Measuring\Velocity limit
Notice!
If the upper limit is too low, a measurement might be impossible because most of the measured values will be marked
as invalid.
