Measurement Modes in the Main Menu
24
6.2.1 Measuring the Air Speed
Fig. 19: Measuring the air speed with
the S-tube
1.
Connect the pressure connector of the S-tube
to the (+) overpressure socket of the Wöhler
DC 410
FLOW
.
2.
Connect the static pressure connector of the
S-tube to the (-) underpressure socket of the
Wöhler DC 410
FLOW
.
3.
In calm air, switch on the Wöhler DC 410
FLOW
and wait until the zeroing procedure of the
sensor has finished.
4.
When closed, the S-tube can be inserted
through the measurement opening into the
gas flow.
5.
Fix the S-tube with a cone, open it and direct
the sensors as shown in the figure.
6.
If necessary, adapt the S-tube to the cross
section of the gas line with the help of the two
knurled screws.
NOTE!
The S-tube must be adjusted before the meas-
urement procedure starts, since it is required to
check and/or adjust the oppositely running orien-
tation of the measuring tubes after loosening the
knurled screws and adjusting the immersion
depth.
Fig. 20: Air speed measurement
7.
In the main menu, select "Air speed" and
confirm with OK.
The air speed v is indicated in the upper part of
the display. The temperature, measured by the
sensor or the S-tube, and the ambient pressure
Pamb, measured by the integrated ambient pres-
sure sensor, are indicated in the lower part of the
display.
Also the differential pressure P
D
and the density
ρ
are indicated.
Static pressure
Temperature
Flow
Knurled screws
Immersion
depth
