17 SuperUser-Modus
FLUXUS ADM 8027, F801, ADM 8127B
UMFLUXUS_F8V4-6-1EN, 2018-10-10
117
17.3.1
Profile Bounds
17.3.2
Correction of the Flow Velocity
After the profile bounds have been defined (see section 17.3.1), 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.
Select
user
if the profile bounds are to be defined. If
factory
is selected, the default pro-
file bounds will be used and the menu item
Calibration
will be displayed (see section
17.3.2).
Press ENTER.
Enter the max. Reynolds number at which the flow is laminar. The entered number will be
rounded to the hundreds. Enter
0
(zero) to use the default value of 1 000.
Press ENTER.
Enter the min. Reynolds number at which the flow is turbulent. The entered number will be
rounded to the hundreds. Enter
0
(zero) to use the default value of 3 000.
Press ENTER.
A request is displayed if an additional correction of the flow velocity is to be defined. Select
on
to define the correction data,
off
to work without correction of the flow velocity and re-
turn to the menu item
SYSTEM settings
.
For the definition of the correction of the flow velocity see section 17.3.2.
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 calcula-
tion 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
is selected, enter the slope. The input
0.0
deactivates the correction. 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
A:Profile bounds
factory
>USER<
Laminar flow
ifR*<
0
Turbulent flow
if R*>
0
A:Calibration ?
>OFF<
on
A:Calibration ?
off
>ON<
A:Slope=
1.000
A:Offset=
0.0
cm/s
