Sensor Data (Air Gap) - Roland R1000 Series Manual

B0048191 / Rev. 1.5
2.6

Sensor data (air gap)

Double sheet thresholds above 120% reduce the performance of the system with regard to air gaps
between the sheets and increase the systems reaction time according to the diagram.
Air gaps influence the performance negatively because air has - in contrast to steel - a high
resistance to the magnetic flux. Therefore, air gaps reduce the performance of the system
considerably (see chapter "3.1 Measuring principle and conditions influencing measurement
accuracy").
For reliable double sheet monitoring there should be no air gap between sheet and sensor and also
between the sheets. The most reliable double sheet recognition results, if no air gaps exist. These
aspects should be specifically observed when mounting the sensors.
The eddy current principle is more forgiving with regard to air gaps than the electromagnetic
principle. However, for most reliable performance precaution should be taken to avoid air gaps
between sensor and sheet. The permissible air gaps between first and second sheet can be slightly
higher than for steel.
The influence of air gaps are described in the following diagrams.
Max. air gap between sensor and first sheet (1st air gap)
3,0
2,8
2,6
2,4
2,2
2,0
1,8
1,6
1,4
1,2
1,0
0,8
PW42AGS
0,6
0,4
0,2
0,5
Max. air gap between first and second sheet (2nd air gap)
11
10
9
8
7
6
5
4
3
2
PW42AGS
1
0,5
The data apply for a set upper limit of 120%.
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Double Sheet Detector R1000 series UDK20
with integrated fieldbus interface
1,5 2 2,5 3 3,5
1,5 2 2,5 3 3,5
Manual
NF
FE
4 4,5 5 5,5 6
NF
FE
4 4,5 5 5,5 6
Technical data
1.
6,5 7 Sheet thickness
[mm]
2.
6,5 7
[mm]
15