Knick Stratos Multi E401N - Page 56

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 EndpH
0
20
mA
4
8
12
16
4 6 82 10 12 14
Start EndpH
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 EndpH
0
20
mA
4
8
12
16
4 6 82 10 12 14
1
2
Start EndpH
20
mA
4
8
12
16
6 82 10 12 144
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 EndμS/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 EndμS/cm
0
20.0
mA
4.0
8.0
12.0
16.0
200 300 400100 500 600 700 800 900 1000