FISCHER Mess- und Regeltechnik GmbH Operation | 5
BA_EN_DE90 57
5.5.1.3.3 Characteristic C1 (volume flow)
Directory: \Parametrierung\Kanal1\Kennlinie K1
Level: 3
Characteristic C1
1 2 3 4
Displ.range C1 unit
Displ.range C1 end
K factor C1
Air density C1
U
A
Fig.73: Characteristic C1 (volume flow)
Menu name Description
Displ.range C1 unit A This parameter can be used to set a
unit for the display.
Displ.range C1 end The end of the display range is defined
with this parameter.
K factor C1 This parameter is used to enter the
specific calibration factor for the panel
type.
Air density C1 This parameter can be used to enter
the air density at operating temperat-
ure.
Formula C1 A The calculation formula is selected in
this menu.
Back E This represents the output (exit) of the
menu. It is used to return to the Chan-
nel 1 menu.
This function allow the volume flow to be measured by means of an effective
pressure procedure.
q =
q:
k:
Volume flow
K factor
k
Δp: Differential pressure
Δp
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-
meter K factor C1 .
The calculation formula of the manufacturer can deviate from the basic formula.
Therefore the manufacturer of the ventilator used in the menu Formula C1
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 Air density C1 .
As standard, the density is preset with 1.2040 kg/m
3
.
(5)
(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
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