Emerson Rosemount TCL, Manual

Page: 105 / 108

For example, start with a simulated resistance of 103.9 Ω , which corresponds to 10.0 °C.
Assume the offset from the sensor calibration was -0.3 Ω . Because of the offset, the
transmitter calculates temperature using 103.6 Ω . The result is 9.2 °C. Now change the
resistance to 107.8 Ω , which corresponds to 20.0 °C. The transmitter uses 107.5 Ω to
calculate the temperature, so the display reads 19.2 °C. Because the difference between
the displayed temperatures (10.0 °C) is the same as the difference between the simulated
temperatures, the transmitter is working correctly.
Temp. (°C) Pt 100 (
Ω)
0 100.0
10 103.9
20 107.8
25 109.7
30 111.7
40 115.5
50 119.4
60 123.2
70 127.1
80 130.9
85 132.8
90 134.7
100 138.5
Troubleshooting
Instruction Manual 97