17 Advanced functions
FLUXUS F60* 17.5 Cut-off flow
155
UMFLUXUS_F60xV5-0EN, 2017-10-16
If the flow velocity is higher than the upper limit,
• the measured value will be marked as invalid. The physical quantity cannot be deter-
mined.
• the LED of the measuring channel will light red
• an exclamation point (!) will be displayed after the unit of measurement (in case of a
normal error a question mark (?) is displayed)
17.5 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 derived values 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. Two independent
limits are set for the positive and negative flow directions.
• 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.
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
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