FLUXUS F70x 11 Advanced Measuring Functions
104 UMFLUXUS_F7V4-6-2EN, 2017-10-01
11.5 Cut-off Flow
The cut-off flow is a lower limit for the flow velocity. All measured flow velocities that are lower than the limit and their de-
rived values are set to zero.
The cut-off flow can depend on the flow direction or not. The cut-off flow is set in Special Funct.\SYSTEM set-
tings\Measuring\Cut-off Flow.
If Cut-off Flow\sign and user are selected, two values will have to be entered:
If Cut-off Flow\absolut and user is selected, only one value will have to be entered:
11.6 Uncorrected Flow Velocity
For special applications, the uncorrected flow velocity might be of interest.
The profile correction for the flow velocity is activated in Special Funct.\SYSTEM settings\Measuring\Flow Veloc-
ity.
Uncorrected flow velocities transmitted to a PC are marked with uncorr.
Select sign to define a cut-off flow in dependence on the flow direction. Two independent
limits are set for the positive and negative flow directions.
Select absolut to define a cut-off flow independently of the flow direction. A limit is set for
the absolute value of the flow velocity.
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. Press ENTER.
All positive values of the flow velocity that are lower than this limit will be set to zero.
Enter the cut-off flow. Press ENTER.
All negative values of the flow velocity greater than this limit will be set to zero.
Enter the cut-off flow. Press ENTER.
The absolute values of all flow velocity values that are lower than this limit will be set to ze-
ro.
Select normal to display and transmit the flow velocity with profile correction.
Select uncorr. to display the flow velocity without profile correction. Press ENTER.
If uncorr. is selected, it has to be confirmed each time the program branch Measuring
is selected if the profile correction is to be used.
If no is selected, the profile correction will be switched off.
All physical quantities will be calculated with the uncorrected flow velocity.
During the measurement, the designation of the physical quantity will be displayed in capi-
tal letters to indicate that the value is uncorrected.
Press ENTER.
If yes is selected, the uncorrected flow velocity will only be used if the flow velocity is se-
lected as the physical quantity in the program branch Output Options.
All other physical quantities (volumetric flow rate, mass flow, rate etc.) will be determined
with the corrected flow velocity.
During the measurement, the designation of the physical quantity will be displayed in capi-
tal letters to indicate that the value is uncorrected.
Press ENTER.
In both cases, the corrected flow velocity can also be displayed.
Press key to scroll until the flow velocity is displayed. The uncorrected flow velocity is
marked with U.
Cut-off Flow
absolut >SIGN<
Cut-off Flow
factory >USER<
Flow Velocity
>NORMAL< uncorr.
A:Flow Velocity
*U 54.5 m/s
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