16 Advanced functions
FLUXUS F501 16.4 Cut-off flow
105
UMFLUXUS_F501V1-3EN, 2020-06-30
16.4 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 derived
quantities are set to zero.
The cut-off flow can depend on the flow direction. The cut-off flow is set in Special Funct.\SYSTEM settings\
Measuring\Cut-off Flow.
• Select sign to define a cut-off flow depending on the flow direction. One limit is set for the positive and negative flow velocity.
• Select absolut to define a cut-off flow independent 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.
If Cut-off Flow\sign and user are selected, 2 values have to be entered:
• Enter the cut-off flow.
• Press ENTER.
All positive values of the flow velocity smaller than this limit are 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.
If Cut-off Flow\absolut and user are selected, only one value have to be entered:
• Enter the cut-off flow.
• Press ENTER.
All absolute values of the flow velocity smaller than this limit are set to zero.
Notice!
If the upper limit is too low, a measurement might be impossible because most of the measured values will be marked
as invalid.
Special Funct.\SYSTEM settings\Measuring\Cut-off Flow
Special Funct.\...\+Cut-off Flow
Special Funct.\...\-Cut-off Flow
Special Funct.\...\Cut-off Flow
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