Siemens sitrans tr300, Руководство пользователя

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Functions
9.15 Special characteristic curve
SITRANS TR200/TR300
Operating Instructions, 06/2010, A5E01071992-03
55
Example
The transmitter is used for measuring a customer-specific thermocouple. The thermocouple
supplies the following mV signals in this case:
● At the start of scale value: - 10 mV (equals -100 °C)
● At full scale value: 40 mV (400 °C)
Proceed as follows
Note
It may be necessary to perform a sensor calibration at the start of scale value (-10 mV) and
full scale value (40 mV) before the sensor characteristic is recorded and the correction
values have been entered.
1. The mV transmitter sensor class is selected using the parameter assignment software
SIPROM T or SIMATIC PDM.
2. Characteristic curve correction of the thermocouple should be performed across 6 pairs
of values. The type of cold junction compensation is a fixed value = 0 °C.
3. Parameter entries
Sensor signal at
transmitter input
Characteristic curve pair Measured value [i] after
characteristic curve
correction
Pair of values X[i] Y[i]
-10 mV i = 1 0 % 0 % -100 °C
-5 mV i = 2 10 % 15 % -25 °C
0 mV i = 3 20 % 20 % 0 °C
15 mV i = 4 50 % 55 % 175 °C
35 mV i = 5 90 % 95 % 375 °C
40 mV i = 6 100 % 100 % 400 °C