Stratos Multi E401N
56
Characteristic Curves
Linear Characteristic
The process variable is represented by a linear output current curve.
Output 4 … 20 mA, span pH 0 … 14
Output 4 … 20 mA, span pH 5 … 9
Start
End
pH
0
20
mA
4
8
12
16
4
6
8
2
10
12
14
Start
End
pH
5
20
mA
4
8
12
16
6
7
8
9
Trilinear/Bilinear Curve
Requires the input of two additional vertex points.
Trilinear: Vertex points
(1)
and
(2)
are different values.
Bilinear: Vertex points
(1)
and
(2)
are the same values.
Output 4 … 20 mA, span pH 0 … 14
Output 4 … 20 mA, span pH 5 … 9
Start
End
pH
0
20
mA
4
8
12
16
4
6
8
2
10
12
14
1
2
Start
End
pH
20
mA
4
8
12
16
6
8
2
10
12
14
4
2
1
Function/Logarithmic Curve
Nonlinear output current characteristic: allows measurements over several decades, e.g. measuring
very low values with a high resolution and high values with a low resolution. Requires the input of the
value for 50 % output current.
Characteristic: Function with input of 50 % value
(1)
Characteristic: Logarithmic
Output 4 … 20 mA, span 1 … 100 µS/cm
Output 4 … 20 mA, span 1 … 1000 µS/cm
Start
End
μS/cm
0
20.0
mA
4.0
8.0
12.0
16.0
20 30 40
10
50 60 70 80 90 100
1
Start
End
μS/cm
0
20.0
mA
4.0
8.0
12.0
16.0
200 300 400
100
500 600 700 800 900 1000
