ABB RELION REX640 - Page 172

When a resistance type signal is connected to the RTD channel and the application
requires a linear scaling of the input range, the Value unit setting value has to be set
to "Dimensionless" so that the input range can be linearly scaled with the settings
Input minimum and Input maximum to Value minimum and Value maximum . When
resistance is used as a value unit, Value unit has to be "Ohm". When Value unit is set
to "Ohm", the default range (0…4000 Ω) can be decreased with the Value maximum
and Value minimum settings.
RTD temperature vs. resistance
The resistance values of temperature sensors at specified temperatures are given in
Table 102 .
Table 102: Temperature vs. resistance
Temp °C Platinum TCR 0.00385 Nickel TCR 0.00618
Pt 100 Pt 250 Ni 100 Ni 120 Ni 250
–40 84.28 210.70 79.13 94.96 197.83
–30 88.22 220.56 84.15 100.97 210.36
–20 92.16 230.40 89.30 107.16 223.24
–10 96.09 240.21 94.58 113.50 236.45
0 100.00 250.00 100.00 120.00 250.00
10 103.90 259.76 105.55 126.66 263.88
20 107.79 269.48 111.24 133.48 278.09
30 111.67 279.18 117.06 140.47 292.64
40 115.54 288.85 123.01 147.61 307.53
50 119.40 298.49 129.11 154.93 322.76
60 123.24 308.10 135.34 162.41 338.35
70 127.08 317.69 141.72 170.06 354.30
80 130.90 327.24 148.25 177.90 370.63
90 134.71 336.77 154.93 185.92 387.34
100 138.51 346.26 161.78 194.13 404.45
110 142.29 355.73 168.79 202.55 421.97
120 146.07 365.17 175.97 211.17 439.93
130 149.83 374.58 183.33 220.00 458.34
140 153.58 383.96 190.89 229.06 477.22
150 157.33 393.31 198.63 238.36 496.59
160 161.05 402.64 206.59 247.91 516.47
170 164.77 411.93 214.76 257.71 536.89
180 168.48 421.20 223.15 267.78 557.88
190 172.17 430.43 231.78 278.14 579.46
200 175.86 439.64 240.66 288.79 601.65
Basic functions 1MRS759142 F
172 REX640
Technical Manual