X20 system modules • Other functions • X20CM4810
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X20 system User's Manual 3.10
Interference
A backlash on the sensors occurs near electromechanical machines such as motors and generators due to elec-
tromagnetic alternating fields, the associated induction and magnetostriction. This backlash is very low, however,
due to the screening concept used and the use of IEPE technology.
This effect is specified in the interference transfer factor. It is determined by a magnetic flow density of 0.01 T and
a frequency of 50 Hz.
Information:
B&R sensors have an isolated base. When using sensors from other manufacturers, it is important
to pay attention to isolation/screening in order to minimize interference. This allows interference fre-
quencies with single and double mains frequency.
Linearity
The piezoelectric sensor is linear over long distances of the frequency response.
Frequency response
The frequency response of the sensor is determined by its mechanical construction. The seismic mass and the
rigidity of the inner structure is crucial here, as is its construction.
The sensitivity is linear in other areas of the frequency response. The frequency response only increases signifi-
cantly when near the resonant frequency. Since misinterpretations can occur in proximity to the resonant frequen-
cy, the resonant frequency must be correspondingly high.
50
40
30
20
10
0
-10
-20
-30
-40
-50
1
10
100
1000
10,000
100,000
Frequency [Hz]
Se
ns
iti
vi
ty
[d
B]
Figure 645: Frequency response of 0ACS100A.00-1 and 0ACS100A.90-1 sensors from B&R
Installing sensors
Sensors can be connected to object to be measured using various methods. How the sensors are installed on the
measurement object is crucial for the quality of the overall measurement.
In order to transfer all frequency portions to be measured to the sensor accordingly, very good coupling of the
sensor to the mechanical component is necessary.
Machine parts may be subject to temperature-related expansion and deformation, with the result that the sensor
no longer has its whole measurement surface available. This affects the quality of the measurement.
Figure 646: Temperature deformation of a machine part (excessive deformation shown)
Summary of Contents for X20 System
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