Siemens sitrans tr200, Operating Instructions Manual

Page: 49 / 78

Functions
8.15 Special characteristic curve
SITRANS TR200/TR300
Operating Instructions, 04/2007, A5E01071992-01
49
Example of a parameter
The establishment of the value pairs X[i] and Y[i] is explained below, using the example of
the value pair i = 3.
Calculation X[i=3]
The characteristic curve parameter X[3] = 0 mV corresponds to 20 % as a percentage in
relation to
the start of measurement = -10 mV and end of measurement = 40 mV.
X[3] =
100% =
. 0 mV - (-10 mV)
40 mV - (-10 mV)
100% = 20%
.
Sensor signal [mV] - start of scale value [mV]
Full scale value [mV] - start of scale value [mV]
Calculation Y[i=3]
100% =
Temperature value [°C] - start of scale value [°C]
Full scale value [°C] - start of scale value [°C]
.
0°C - (-100°C)
400°C - (-100°C)
100% = 20%
.
Y[3] =
The following pair of values must be transferred to the parameter assignment software for
the characteristic curve correction of the pair of values i = 3: X[3] = 20 % and Y[3] = 20 %.