FISCHER PRO-LINE DE90 Operating Manual page 57

FISCHER Mess- und Regeltechnik GmbH
5.5.1.3.3 Characteristic C1 (volume flow)
BA_EN_DE90
Directory: \Parametrierung\Kanal1\Kennlinie K1
Level: 3
Characteristic C1
1
Fig. 73: Characteristic C1 (volume flow)
Menu name
Displ.range C1 unit
Displ.range C1 end
K factor C1
Air density C1
Formula C1
Back
This function allow the volume flow to be measured by means of an effective
pressure procedure.
q: Volume flow
k: K factor
Δp: Differential pressure
Fig. 74: Volume flow basic formula
The ventilator is equipped with a measuring device to measure the volume flow.
Each manufacturer states a K factor for his ventilator. This is filed with the para-
K factor C1
meter
The calculation formula of the manufacturer can deviate from the basic formula.
Therefore the manufacturer of the ventilator used in the menu
must be selected.
Due to the fact that the volume of a gas changes with the pressure and the tem-
perature, the air pressure at operating temperature is taken into account in the
calculation. The value can be entered with the parameter
As standard, the density is preset with 1.2040 kg/m
(5)
This value corresponds to the air density at 20 °C as sea level at an atmospheric pressure of
1013.25 hPa and dry air
Displ.range C1 unit
Displ.range C1 end
K factor C1
Air density C1
2 3 4
Description
A
This parameter can be used to set a
unit for the display.
The end of the display range is defined
with this parameter.
This parameter is used to enter the
specific calibration factor for the panel
type.
This parameter can be used to enter
the air density at operating temperat-
ure.
A
The calculation formula is selected in
this menu.
E
This represents the output (exit) of the
menu. It is used to return to the Chan-
nel 1 menu.
k
q = Δp
.
Operation | 5
U
A
Formula C1
Air density C1
3 (5)
.
.
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