FISCHER Mess- und Regeltechnik GmbH
Parameterization | 5
BA_EN_EA16
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This is not necessary for dynamic filter monitoring. An approximation of the filter
characteristic curve is calculated by determining some system-specific paramet-
ers. This approximating characteristic curve can now be used to determine the
level of soiling of the filter at any time without changing the ventilator speed.
Parameters
The differential pressure in the filter increases as dust is deposited. This in-
crease for large dust filters is approximated in a squared manner and in a linear
manner for suspended matter filters. The approximation equation that is used
therefore depends on the system.
There are four channels available to measure differential pressure and flow
rate. Therefore, two air filters can be monitored with one device.
If two ventilation channels are set to one filter, a further input is required to mon-
itor the second flow rate. In this case, only one filter can be monitored.
Example1:
One air filter should be monitored on which two ventilation channels are placed.
The level of soiling, the differential pressure and the two flow rates should be
shown.
Parameters
Channel
Display
Analogue input1
Channel 1
Degree of soiling
Channel dP: 2
Channel 2
Differential pressure
Channel 1V: 3
Channel 3
Volume flow 1
Channel 2V: 4
Channel 4
Volume flow 2
Example2:
Two air filters can be monitored with one device. The level of soiling and flow
rate should be shown.
Parameters
Channel
Display
Analogue input1
Channel 1
Degree of soiling filter 1
Channel dP: 1
Channel 1
Channel 1V: 2
Channel 2
Volume flow filter 1
Analogue input3
Channel 3
Degree of soiling filter 2
Channel dP: 3
Channel 3
Channel 1V: 4
Channel 4
Volume flow filter 2
The filter characteristic curve generally looks like this:
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
clean filter (SF)
soiled filter (VF)
V-zero-point window
Fig. 83:
Filter characteristic curve
