Measurement Modes in the Main Menu
26
6.3
Option „Airflow
(Pitot)
“
In this menu, the airflow is measured in l/s or in
m
3
/h. Select the unit in the setup menu. (see
chapter 6.12)
With the Wöhler DC 410
FLOW
, a grid point meas-
urement can be done, so that the information pro-
vided by the measurement is significant (see
chapter 6.3.2).
6.3.1 Measuring the Airflow
(Pitot)
Connect the S-tube probe to the Wöhler DC
410
FLOW
and insert it into the measurement open-
ing. Proceed as described in chapter 0
Fig. 21: Menu Airflow (Pitot)
After the Menu "Airflow (Pitot)" has been selected,
the current airflow value
will be indicated.
The airflow is calculated from the surface area
and the air speed.
Formula 3
The Airflow
is indicated in the unit which has
been selected in the setup-menu.
Underneath the airflow
is indicated in the other
possible unit.
Also the following values are indicated.
Room temperature T
int
, when there is no tempera-
ture sensor connected (see figure).
If temperature sensors are connected, T
1
will
show the temperature measured by the sensor
connected left and T
2
will measure the tempera-
ture measured by the sensor connected right.
Air speed
.
Air pressure
P
amb
Differential pressure
P
D
Air density
Pitot factor of the S-tube probe Pf: can be adjust-
ed in the setup menu, 0.93 for the Wöhler S-tube
probe
, 1.0 for a “normal” Prandl tube)
Cross section area A of the duct (The user has to
enter the cross section area A as follows:)
