Measurement Modes in the Main Menu
52
urement” is selected in the setup-menu. (Set-
up>attenuation>fine pressure measurement.)
Default: 75%
Temperature unit
Select the temperature unit °C or °F.
Airflow unit
Select between m
3
/h or l/s The airflow value will
be indicated in the selected unit in the center of
the display and below, smaller, in the other unit.
Exponent
Here the exponent of the formula of chapter 6.4
(Airflow (k value)) is entered. Per default the ex-
ponent is 0.50. The exponent can be risen from
0.50 to 1.00. It is only necessary to change the
exponent, if another exponent is specified in the
data sheet of the air vent.
Brightness
Adjust the brightness of the display from 20 % to
90 %.
Printer
Here the user can select between printing with the
Wöhler thermal fast printer TD 600 or another
printer.
Print graph
Option "Yes": A graph will be printed with the dia-
gram.
Option "No": No graph will be printed. The
preselected option is "Yes".
Search by
Select between "customer name" and "customer
number". Depending on this selection, the name
or the number of the customer can be selected in
the customer menu.
Pitot factor
The pitot factor is important for the measurement
of the flow speed. It depends on the cross section
of the utilized s-tube. The pitot factor of the
Wöhler S-tube probe is 0.93. Therefore the prese-
lected value is 0.93.
If a
“normal” S-tube is connected, the pitot factor
1.0 has to be entered.
Thermal capacity
The default setting of the thermal capacity is
0,2790 Wh/kg °C. The value is important for the
measurement of the ventilation loss (Energy Utili-
zation Check)
Reference temperature
The reference temperature can be adjusted from
- 30 °C to + 70 °C.
Alpha
Heat transmission coefficient for the u-value
