5 | Parameterization
FISCHER Mess- und Regeltechnik GmbH
60 / 88
BA_EN_EA16
Explanation of the variables used:
Flow rate
V =
dV
dt
The flow rate states how much volume of a gas flows through a defined cross-section in a certain time.
The flow rate is stated in m³/h.
V
max
Maximum flow rate of the ventilator.
V
NF
V-zero-point window
This parameter is used to define a range
within which the differential pressure measuring values
are reset to zero.
Differential pressureΔp
Current differential pressure above the filter.
Δp
0
(SF)
Differential pressure above the clean filter in the 'zero-point'.
The 'zero-point' is determined by the V-zero-point window.
Δp
max
(SF)
differential pressure above the clean filter at a maximum flow rate.
Δp
max
(VF)
differential pressure above the soiled filter at the maximum flow rate.
The characteristic curves is approximated as follows.
50
Δp
V
1
100
150
200
250
300
2
3
4
5
6
7
8
9 10
[1000 m
3
/h]
[Pa]
Δp
max
(SF)
Δp
max
(VF)
(SF)
Δp
0
V
max
V
NF
Filter characteristic curve
soiled filter
V-zero-point window
Filter characteristic curve
cleaner Filter
soiled filter
cleaner Filter
Fig. 84:
Approximated filter characteristic curve
The parameter
Correction value
can set an offset (k) for the characteristic
curve.
50
Δp
V
1
100
150
200
250
300
2
3
4
5
6
7
8
9 10
[1000 m
3
/h]
[Pa]
Δp
max
(SF)
Δp
max
(VF)
(SF)
Δp
0
V
max
V
NF
Filter characteristic curve
soiled filter
V-zero-point window
Filter characteristic curve
cleaner Filter
soiled filter
cleaner Filter
k
Fig. 85:
Filter characteristic curve correction value
