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2.2 Sensor performance data for ferrous (FE) materials
The following diagram shows the reaction time of the system on detecting double sheet, depending on the
nominal sheet thickness and the selected upper switching limit (UL) 150% or 120%.
Example: Nominal thickness 1.5 mm = 100% (.06 in. = 100%), measurement with 1 sensor.
The maximum system reaction time for detecting the exceeding of the double sheet threshold is 63 ms at
120% UL. This means, it takes 63 milliseconds after having recognized the measurement start signal until
the result is available at the output.
The data for 2 sensors apply in the so-called sequencer mode.
170
160
150
140
130
120
110
100
90
80
70
60
50
40
0
0,5
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 accuray").
For reliable double sheet monitoring there must not be any air gap between sheet and sensor as well as no
air gap between the sheets. This aspect has to be considered when mounting the sensors and selecting
the place of installation. The influence of air gaps can be read from the following diagrams.
ROLAND ELECTRONIC GMBH · Otto-Maurer-Str. 17 · D-75210 Keltern · Telefon (0049) (07236) 9392-0 · Telefax (0049) (07236) 9392-33
OPERATING INSTRUCTIONS
DOUBLE SHEET DETECTOR R1000 UDK20
1,0
1,5
2,0
2,5
Normal working range
(0 to .16 inch)
2 sensors
1 sensor
3,0
3,5
4,0
Single sheet thickness
(nominal thickness) [mm]
Picture: System reaction time for ferrous material
B0048991
PW42AGS
150%
120%
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