16 Advanced functions
16.2 NoiseTrek parallel beam mode
FLUXUS F501
2020-06-30, UMFLUXUS_F501V1-3EN
104
Totalizer overflow
The overflow behavior of the totalizers can be set:
• Select the menu item
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
NoiseTrek parallel beam mode
The NoiseTrek parallel beam mode works with parallel mounted transducers. It improves the signal quality when measur
-
ing on small pipes or with strongly attenuating fluids.
• Select the menu item
Special Funct.\SYSTEM settings\Measuring
.
• Press ENTER until the menu item
Enable NoiseTrek
is displayed.
• Select
on
to enable the NoiseTrek parallel beam mode,
off
to disable it.
• Press ENTER.
16.3
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 the menu item
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.
• 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 (wrapping)
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\Enable NoiseTrek
Special Funct.\SYSTEM settings\Measuring\Velocity limit