Manual
Double Sheet Detector-series I20
System description
B0069991 / Rev. 1.7
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3.5.3 Program
parameters
3.5.3.1 Program parameters for the Double sheet detection
This menu structure is valid for the system types a – f (for details refer to chapter 3.2)
For measuring an eddy current method is used – called “Transmission” measurement. For
linearization purposes there are compensation curves, applicable to various conductivities and
thicknesses. Magnetical materials have their own compensation curves.
To determine the compensation curves a calibration (later merely called “Teach-In“) must be
performed.
In order to avoid frequent Teach-In procedures for different materials and thicknesses, the unit
provides for 255 program memories. Every such memory consists of a data set with the relevant
parameters.
“Program number”
Selects the number of the data set (1…255) which is to be applied for measurement.
“Sensor number“
Input of the selected sensor (/sensor sequence) for multi-channel systems (e.g. I20-4-…).
“Nominal thickness“
Specifies the nominal thickness of the sheets to be measured.
Value range 0.000…15.00 mm (0.000…0.590 in) Default setting 0.00mm / 0.000 inch.
“Material”
Specifies the material to be measured.
Choices: ferromagnetic material, non-magnetic material and non-magnetic material with unknown
conductivity.
“Lower limit TL“
and
“upper limit TU“
Changes the limit values for the lower and upper switching threshold. The values can be entered
either in % or in mm/inch. On these thresholds depend the status signals.
In a window comparator the three signals will be generated from the measuring signal. The signal
“0-sheet“ is generated when the measuring signal falls short of the lower switching threshold TL.
The lower switching threshold TL can be set from 1...99%. The signal “2-sheet“ is generated when
the upper switching threshold is exceeded. The upper switching threshold TU can be set from
100...180%. If the measuring value is within both limits, the signal “1-sheet“ is generated.
Signal range for 0-sheet
Signal range for 1-sheet
Signal range for 2-sheet
Upper switching threshold
Lower switching threshold
a
b
c
TU
TL
Fig. 9: Visualization of switching thresholds
2
1
0
Signal
Obere Schaltschwelle
Upper switching threshold
Untere Schaltschwelle
Lower switching threshold
a
b
c
