Example of linearisation:
An analog pressure sensor (P) is to indicate the volume of the target material in a
vessel.
The output signal of the sensor is proportional to the level of the tank, however not
to the volume. Proceed as follows to receive a volume display:
1. Divide the non-linear area of the tank into 8 parts of the same size.
2. Enter the output values of the sensor for level X1 up to X9 (parameters P41 to
P49). Enter the measured value for the full tank in parameter P50.
3. Now enter the requested displayed value (target quantity) in parameters P51 to
P60.
4. Then set parameter P16 to the value 1.
8. Configuration of the outputs
Set the following parameters:
• Preset 1: limit value at which OUT 1 changes its switching performance:
parameter P10.
• Preset 2: limit value at which OUT 2 changes its switching performance:
parameter P11.
• Switching function of OUT 1 and OUT 2: switch when the preset has been
exceeded / not reached: parameter P12.
• Fleeting time (pulse stretching) for OUT 1 ... OUT 3: parameters P18 ... P20.
• Start-up delay: Suitable for monitoring the min. value (OUT 1). The error signal
"min. value not reached", for instance, can be suppressed until the plant has been
run up: parameter P29.
16
DIGITAL DISPLAY
DA 340
X1 X2 X3 X4 X5 X6 X7 X8 X9 X10
Y10
Y8
Y9
Y7
Y1
...
X1
X2
X3
X4
X5
X6
X7
X8
X9
X10
P
output values of the sensor
displayed value
