41
WIKA operating instructions digital indicator, model DI35-D
EN
7. Description of program numbers
140553539.03 03/2020 EN/DE
Example
Linearisation of a pressure sensor for 0 ... 100 mbar with an output signal of 0 ... 20 mA.
■
Programming with 5 interpolation points.
■
Non-linear range 0 ... 75 mbar.
Interpo-
lation
point
Pres-
sure
[mbar]
Transmitter out-
put signal [mA]
Display value [mbar]
before
linearisation
after linearisation
PN 2
0
0.5
2.5
0.0
PN 101
15
3.3
16.5
15.0
PN 102
30
6.2
31.0
30.0
PN 103
40
9.2
46
40.0
PN 104
60
11.4
57
60.0
PN 105
75
14.7
73.5
75.0
PN 1
100
20
100.0
100.0
For PN 101 this means:
With a pressure of 15 mbar, the transmitter delivers an output signal of 3.3 mA instead
of 3.0 mA. Therefore, before correction, the display shows 16.5 mbar. This value is
adjusted to 15.0 mbar using the interpolation point.
Anzeigewert
Druck
Mit Linearisierung
Ohne Linearisierung
Stützpunkte
10
20
30
40
50
60
70
80
90 100
110
10
20
30
40
50
60
70
80
90
100
101
102
103
104
105
Display value
Measured value
With linearisation
Without linearisation
Interpolation points
