FLUXUS WD100, WD200 14 SuperUser Mode
70 UMFLUXUS_F5WDV1-1EN, 2016-04-08
14.2.2 Correction of the Flow Velocity
After the profile bounds have been defined (see section 14.2.1), it is possible to define a correction of the flow velocity.
v
cor
= m · v + n
with
All quantities derived from the flow velocity will be calculated with the corrected flow velocity. The correction data will be
transmitted to the PC or printer during the online or offline transmission of data.
Example: profile bound for the laminar flow: 1 500
profile bound for the turbulent flow: 2 500
At Reynolds numbers < 1 500, the flow during the measurement is regarded as laminar for the calcu-
lation of the physical quantity. At Reynolds numbers > 2 500, the flow is regarded as turbulent. The
range 1 500...2 500 is the transition range between laminar and turbulent flow.
Attention! The defined profile bounds are still active after the deactivation of the SuperUser mode.
v – measured flow velocity
m – slope, range: -2.000...+2.000
n – offset, range: -12.7...+12.7 cm/s
v
cor
– corrected flow velocity
Note! During the measurement, it will not be displayed that the correction of the flow velocity is active.
Select on to define the correction data, off to work without correction of the flow velocity
and return to the menu item SYSTEM settings.
If on has been selected, enter the slope. If 0.0 is entered, the correction will be deactivat-
ed.
Press ENTER.
Enter the offset. Enter 0 (zero) to work without an offset.
Press ENTER.
Example 1: Slope: 1.1
Offset: -10.0 cm/s = -0.1 m/s
If a flow velocity v = 5 m/s is measured, before the calculation of the derived quantities, it will be cor-
rected as follows:
v
cor
= 1.1
.
5 m/s - 0.1 m/s = 5.4 m/s
Example 2: Slope: -1.0
Offset: 0.0
Only the sign of the measured values is changed.
Note! The correction data will only be stored when a measurement is started. If the transmitter is switched
off without starting a measurement, the entered correction data will be lost.
Attention! The correction of the flow velocity is still active after the deactivation of the SuperUser mode.
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