Flexim FLUXUS F704**-A2 Series, User Manual

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15 SuperUser Mode FLUXUS F70x
UMFLUXUS_F7V4-6-2EN, 2017-10-01 135
15.3.1 Profile Bounds
15.3.2 Correction of the Flow Velocity
After the profile bounds have been defined (see section 15.3.1), 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 of data.
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
15.3.2).
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 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 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 15.3.2.
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 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.
A:Profile bounds
factory
>USER<
Laminar flow
if R*<
0
Turbulent flow
if R*>
0
A:Calibration ?
>OFF<
on
A:Calibration ?
off
>ON<
A:Slope=
1.00
A:Offset=
0.0 cm/s