Of course, you can calculate the inverse function that gives you the temperature from the voltage delivered by the thermocouple.
coeficients =[-3.23439565e-04 2.05876957e-02 -5.93682771e-01 2.55052633e+01 2.42295885e-01]
Program:
import numpy as np
voltages = [
0.000, 0.039, 0.078, 0.117, 0.156, 0.195, 0.234, 0.273, 0.312, 0.352,
0.391, 0.431, 0.470, 0.510, 0.549, 0.589, 0.629, 0.669, 0.709, 0.749,
0.790, 0.830, 0.870, 0.911, 0.951, 0.992, 1.033, 1.074, 1.114, 1.155,
1.196, 1.238, 1.279, 1.320, 1.362, 1.403, 1.445, 1.486, 1.528, 1.570,
1.612, 1.654, 1.696, 1.738, 1.780, 1.823, 1.865, 1.908, 1.950, 1.993,
2.036, 2.079, 2.122, 2.165, 2.208, 2.251, 2.294, 2.338, 2.381, 2.425,
2.468, 2.512, 2.556, 2.600, 2.643, 2.687, 2.732, 2.776, 2.820, 2.864,
2.909, 2.953, 2.998, 3.043, 3.087, 3.132, 3.177, 3.222, 3.267, 3.312,
3.358, 3.403, 3.448, 3.494, 3.539, 3.585, 3.631, 3.677, 3.722, 3.768,
3.814, 3.860, 3.907, 3.953, 3.999, 4.046, 4.092, 4.138, 4.185, 4.232,
4.279, 4.325, 4.372, 4.419, 4.466, 4.513, 4.561, 4.608, 4.655, 4.702,
4.750, 4.798, 4.845, 4.893, 4.941, 4.988, 5.036, 5.084, 5.132, 5.180,
5.228, 5.277, 5.325, 5.373, 5.422, 5.470, 5.519, 5.567, 5.616, 5.665,
5.714, 5.763, 5.812, 5.861, 5.910, 5.959, 6.008, 6.057, 6.107, 6.156,
6.206, 6.255, 6.305, 6.355, 6.404, 6.454, 6.504, 6.554, 6.604, 6.654,
6.704, 6.754, 6.805, 6.855, 6.905, 6.956, 7.006, 7.057, 7.107, 7.158,
7.209, 7.260, 7.310, 7.361, 7.412, 7.463, 7.515, 7.566, 7.617, 7.668,
7.720, 7.771, 7.823, 7.874, 7.926, 7.977, 8.029, 8.081, 8.133, 8.185,
8.237, 8.289, 8.341, 8.393, 8.445, 8.497, 8.550, 8.602, 8.654, 8.707,
8.759, 8.812, 8.865, 8.917, 8.970, 9.023, 9.076, 9.129, 9.182, 9.235,
9.288, 9.341, 9.395, 9.448, 9.501, 9.555, 9.608, 9.662, 9.715, 9.769,
9.822, 9.876, 9.930, 9.984, 10.038, 10.092, 10.146, 10.200, 10.254, 10.308,
10.362, 10.417, 10.471, 10.525, 10.580, 10.634, 10.689, 10.743, 10.798, 10.853,
10.907, 10.962, 11.017, 11.072, 11.127, 11.182, 11.237, 11.292, 11.347, 11.403,
11.458, 11.513, 11.569, 11.624, 11.680, 11.735, 11.791, 11.846, 11.902, 11.958,
12.013, 12.069, 12.125, 12.181, 12.237, 12.293, 12.349, 12.405, 12.461, 12.518,
12.574, 12.630, 12.687, 12.743, 12.799, 12.856, 12.912, 12.969, 13.026, 13.082,
13.139, 13.196, 13.253, 13.310, 13.366, 13.423, 13.480, 13.537, 13.595, 13.652,
13.709, 13.766, 13.823, 13.881, 13.938, 13.995, 14.053, 14.110, 14.168, 14.226,
14.283, 14.341, 14.399, 14.456, 14.514, 14.572, 14.630, 14.688, 14.746, 14.804,
14.862, 14.920, 14.978, 15.036, 15.095, 15.153, 15.211, 15.270, 15.328, 15.386,
15.445, 15.503, 15.562, 15.621, 15.679, 15.738, 15.797, 15.856, 15.914, 15.973,
16.032, 16.091, 16.150, 16.209, 16.268, 16.327, 16.387, 16.446, 16.505, 16.564,
16.624, 16.683, 16.742, 16.802, 16.861, 16.921, 16.980, 17.040, 17.100, 17.159,
17.219, 17.279, 17.339, 17.399, 17.458, 17.518, 17.578, 17.638, 17.698, 17.759,
17.819, 17.879, 17.939, 17.999, 18.060, 18.120, 18.180, 18.241, 18.301, 18.362,
18.422, 18.483, 18.543, 18.604, 18.665, 18.725, 18.786, 18.847, 18.908, 18.969,
19.030, 19.091, 19.152, 19.213, 19.274, 19.335, 19.396, 19.457, 19.518, 19.579,
19.641, 19.702, 19.763, 19.825, 19.886, 19.947, 20.009, 20.070, 20.132, 20.193,
20.255, 20.317, 20.378, 20.440, 20.502, 20.563, 20.625, 20.687, 20.748, 20.810
]
x = np.array(list(range(0, 400)))
y = np.array(voltages[0:400])
coef = np.polyfit(y, x, 4)
print(coef)
p = np.poly1d(coef)
for t in range(1, 400):
print(f'temp: {t:3d}ºC error:{p(voltages[t])-t:1.2f}ºC')
Result:
[-3.23439565e-04 2.05876957e-02 -5.93682771e-01 2.55052633e+01
2.42295885e-01]
temp: 1ºC error:0.24ºC
temp: 2ºC error:0.23ºC
temp: 3ºC error:0.22ºC
temp: 4ºC error:0.21ºC
temp: 5ºC error:0.19ºC
temp: 6ºC error:0.18ºC
temp: 7ºC error:0.16ºC
temp: 8ºC error:0.14ºC
temp: 9ºC error:0.15ºC
temp: 10ºC error:0.13ºC
temp: 11ºC error:0.13ºC
temp: 12ºC error:0.10ºC
temp: 13ºC error:0.10ºC
temp: 14ºC error:0.07ºC
temp: 15ºC error:0.06ºC
temp: 16ºC error:0.06ºC
temp: 17ºC error:0.05ºC
temp: 18ºC error:0.03ºC
temp: 19ºC error:0.02ºC
temp: 20ºC error:0.03ºC
temp: 21ºC error:0.01ºC
temp: 22ºC error:-0.00ºC
temp: 23ºC error:0.00ºC
temp: 24ºC error:-0.02ºC
temp: 25ºC error:-0.02ºC
temp: 26ºC error:-0.02ºC
temp: 27ºC error:-0.02ºC
temp: 28ºC error:-0.05ºC
temp: 29ºC error:-0.06ºC
temp: 30ºC error:-0.07ºC
temp: 31ºC error:-0.05ºC
temp: 32ºC error:-0.07ºC
temp: 33ºC error:-0.08ºC
temp: 34ºC error:-0.07ºC
temp: 35ºC error:-0.09ºC
temp: 36ºC error:-0.08ºC
temp: 37ºC error:-0.10ºC
temp: 38ºC error:-0.10ºC
temp: 39ºC error:-0.10ºC
temp: 40ºC error:-0.10ºC
temp: 41ºC error:-0.11ºC
temp: 42ºC error:-0.11ºC
temp: 43ºC error:-0.12ºC
temp: 44ºC error:-0.13ºC
temp: 45ºC error:-0.11ºC
temp: 46ºC error:-0.13ºC
temp: 47ºC error:-0.12ºC
temp: 48ºC error:-0.13ºC
temp: 49ºC error:-0.13ºC
temp: 50ºC error:-0.12ºC
temp: 51ºC error:-0.12ºC
temp: 52ºC error:-0.12ºC
temp: 53ºC error:-0.12ºC
temp: 54ºC error:-0.12ºC
temp: 55ºC error:-0.13ºC
temp: 56ºC error:-0.13ºC
temp: 57ºC error:-0.12ºC
temp: 58ºC error:-0.13ºC
temp: 59ºC error:-0.12ºC
temp: 60ºC error:-0.13ºC
temp: 61ºC error:-0.12ºC
temp: 62ºC error:-0.11ºC
temp: 63ºC error:-0.11ºC
temp: 64ºC error:-0.13ºC
temp: 65ºC error:-0.13ºC
temp: 66ºC error:-0.11ºC
temp: 67ºC error:-0.11ºC
temp: 68ºC error:-0.11ºC
temp: 69ºC error:-0.12ºC
temp: 70ºC error:-0.10ºC
temp: 71ºC error:-0.11ºC
temp: 72ºC error:-0.10ºC
temp: 73ºC error:-0.09ºC
temp: 74ºC error:-0.10ºC
temp: 75ºC error:-0.10ºC
temp: 76ºC error:-0.09ºC
temp: 77ºC error:-0.09ºC
temp: 78ºC error:-0.09ºC
temp: 79ºC error:-0.09ºC
temp: 80ºC error:-0.07ºC
temp: 81ºC error:-0.07ºC
temp: 82ºC error:-0.08ºC
temp: 83ºC error:-0.06ºC
temp: 84ºC error:-0.07ºC
temp: 85ºC error:-0.06ºC
temp: 86ºC error:-0.05ºC
temp: 87ºC error:-0.04ºC
temp: 88ºC error:-0.05ºC
temp: 89ºC error:-0.05ºC
temp: 90ºC error:-0.04ºC
temp: 91ºC error:-0.04ºC
temp: 92ºC error:-0.02ºC
temp: 93ºC error:-0.02ºC
temp: 94ºC error:-0.02ºC
temp: 95ºC error:-0.01ºC
temp: 96ºC error:-0.01ºC
temp: 97ºC error:-0.02ºC
temp: 98ºC error:-0.01ºC
temp: 99ºC error:0.00ºC
temp: 100ºC error:0.01ºC
temp: 101ºC error:-0.00ºC
temp: 102ºC error:0.01ºC
temp: 103ºC error:0.01ºC
temp: 104ºC error:0.01ºC
temp: 105ºC error:0.01ºC
temp: 106ºC error:0.04ºC
temp: 107ºC error:0.03ºC
temp: 108ºC error:0.03ºC
temp: 109ºC error:0.02ºC
temp: 110ºC error:0.04ºC
temp: 111ºC error:0.05ºC
temp: 112ºC error:0.04ºC
temp: 113ºC error:0.05ºC
temp: 114ºC error:0.06ºC
temp: 115ºC error:0.05ºC
temp: 116ºC error:0.05ºC
temp: 117ºC error:0.06ºC
temp: 118ºC error:0.06ºC
temp: 119ºC error:0.06ºC
temp: 120ºC error:0.06ºC
temp: 121ºC error:0.08ºC
temp: 122ºC error:0.07ºC
temp: 123ºC error:0.07ºC
temp: 124ºC error:0.08ºC
temp: 125ºC error:0.07ºC
temp: 126ºC error:0.08ºC
temp: 127ºC error:0.07ºC
temp: 128ºC error:0.08ºC
temp: 129ºC error:0.09ºC
temp: 130ºC error:0.09ºC
temp: 131ºC error:0.10ºC
temp: 132ºC error:0.10ºC
temp: 133ºC error:0.10ºC
temp: 134ºC error:0.10ºC
temp: 135ºC error:0.10ºC
temp: 136ºC error:0.09ºC
temp: 137ºC error:0.09ºC
temp: 138ºC error:0.10ºC
temp: 139ºC error:0.09ºC
temp: 140ºC error:0.10ºC
temp: 141ºC error:0.09ºC
temp: 142ºC error:0.10ºC
temp: 143ºC error:0.11ºC
temp: 144ºC error:0.09ºC
temp: 145ºC error:0.10ºC
temp: 146ºC error:0.10ºC
temp: 147ºC error:0.10ºC
temp: 148ºC error:0.10ºC
temp: 149ºC error:0.10ºC
temp: 150ºC error:0.10ºC
temp: 151ºC error:0.09ºC
temp: 152ºC error:0.11ºC
temp: 153ºC error:0.10ºC
temp: 154ºC error:0.09ºC
temp: 155ºC error:0.10ºC
temp: 156ºC error:0.09ºC
temp: 157ºC error:0.10ºC
temp: 158ºC error:0.09ºC
temp: 159ºC error:0.09ºC
temp: 160ºC error:0.10ºC
temp: 161ºC error:0.10ºC
temp: 162ºC error:0.08ºC
temp: 163ºC error:0.08ºC
temp: 164ºC error:0.08ºC
temp: 165ºC error:0.08ºC
temp: 166ºC error:0.09ºC
temp: 167ºC error:0.09ºC
temp: 168ºC error:0.08ºC
temp: 169ºC error:0.07ºC
temp: 170ºC error:0.08ºC
temp: 171ºC error:0.07ºC
temp: 172ºC error:0.08ºC
temp: 173ºC error:0.07ºC
temp: 174ºC error:0.08ºC
temp: 175ºC error:0.06ºC
temp: 176ºC error:0.06ºC
temp: 177ºC error:0.07ºC
temp: 178ºC error:0.07ºC
temp: 179ºC error:0.07ºC
temp: 180ºC error:0.07ºC
temp: 181ºC error:0.06ºC
temp: 182ºC error:0.06ºC
temp: 183ºC error:0.05ºC
temp: 184ºC error:0.05ºC
temp: 185ºC error:0.04ºC
temp: 186ºC error:0.05ºC
temp: 187ºC error:0.04ºC
temp: 188ºC error:0.03ºC
temp: 189ºC error:0.04ºC
temp: 190ºC error:0.03ºC
temp: 191ºC error:0.03ºC
temp: 192ºC error:0.04ºC
temp: 193ºC error:0.02ºC
temp: 194ºC error:0.02ºC
temp: 195ºC error:0.02ºC
temp: 196ºC error:0.02ºC
temp: 197ºC error:0.02ºC
temp: 198ºC error:0.02ºC
temp: 199ºC error:0.01ºC
temp: 200ºC error:0.01ºC
temp: 201ºC error:0.00ºC
temp: 202ºC error:0.01ºC
temp: 203ºC error:0.01ºC
temp: 204ºC error:-0.00ºC
temp: 205ºC error:0.01ºC
temp: 206ºC error:-0.00ºC
temp: 207ºC error:0.00ºC
temp: 208ºC error:-0.01ºC
temp: 209ºC error:-0.01ºC
temp: 210ºC error:-0.02ºC
temp: 211ºC error:-0.02ºC
temp: 212ºC error:-0.02ºC
temp: 213ºC error:-0.02ºC
temp: 214ºC error:-0.02ºC
temp: 215ºC error:-0.02ºC
temp: 216ºC error:-0.02ºC
temp: 217ºC error:-0.02ºC
temp: 218ºC error:-0.03ºC
temp: 219ºC error:-0.03ºC
temp: 220ºC error:-0.04ºC
temp: 221ºC error:-0.03ºC
temp: 222ºC error:-0.04ºC
temp: 223ºC error:-0.05ºC
temp: 224ºC error:-0.04ºC
temp: 225ºC error:-0.05ºC
temp: 226ºC error:-0.04ºC
temp: 227ºC error:-0.05ºC
temp: 228ºC error:-0.05ºC
temp: 229ºC error:-0.05ºC
temp: 230ºC error:-0.06ºC
temp: 231ºC error:-0.06ºC
temp: 232ºC error:-0.06ºC
temp: 233ºC error:-0.06ºC
temp: 234ºC error:-0.06ºC
temp: 235ºC error:-0.06ºC
temp: 236ºC error:-0.06ºC
temp: 237ºC error:-0.07ºC
temp: 238ºC error:-0.07ºC
temp: 239ºC error:-0.06ºC
temp: 240ºC error:-0.07ºC
temp: 241ºC error:-0.07ºC
temp: 242ºC error:-0.06ºC
temp: 243ºC error:-0.07ºC
temp: 244ºC error:-0.06ºC
temp: 245ºC error:-0.07ºC
temp: 246ºC error:-0.07ºC
temp: 247ºC error:-0.08ºC
temp: 248ºC error:-0.07ºC
temp: 249ºC error:-0.07ºC
temp: 250ºC error:-0.08ºC
temp: 251ºC error:-0.08ºC
temp: 252ºC error:-0.08ºC
temp: 253ºC error:-0.08ºC
temp: 254ºC error:-0.08ºC
temp: 255ºC error:-0.08ºC
temp: 256ºC error:-0.08ºC
temp: 257ºC error:-0.08ºC
temp: 258ºC error:-0.08ºC
temp: 259ºC error:-0.07ºC
temp: 260ºC error:-0.08ºC
temp: 261ºC error:-0.08ºC
temp: 262ºC error:-0.07ºC
temp: 263ºC error:-0.08ºC
temp: 264ºC error:-0.08ºC
temp: 265ºC error:-0.07ºC
temp: 266ºC error:-0.08ºC
temp: 267ºC error:-0.08ºC
temp: 268ºC error:-0.07ºC
temp: 269ºC error:-0.08ºC
temp: 270ºC error:-0.08ºC
temp: 271ºC error:-0.07ºC
temp: 272ºC error:-0.07ºC
temp: 273ºC error:-0.06ºC
temp: 274ºC error:-0.08ºC
temp: 275ºC error:-0.08ºC
temp: 276ºC error:-0.08ºC
temp: 277ºC error:-0.08ºC
temp: 278ºC error:-0.06ºC
temp: 279ºC error:-0.06ºC
temp: 280ºC error:-0.06ºC
temp: 281ºC error:-0.06ºC
temp: 282ºC error:-0.07ºC
temp: 283ºC error:-0.06ºC
temp: 284ºC error:-0.06ºC
temp: 285ºC error:-0.07ºC
temp: 286ºC error:-0.05ºC
temp: 287ºC error:-0.06ºC
temp: 288ºC error:-0.05ºC
temp: 289ºC error:-0.04ºC
temp: 290ºC error:-0.05ºC
temp: 291ºC error:-0.04ºC
temp: 292ºC error:-0.04ºC
temp: 293ºC error:-0.05ºC
temp: 294ºC error:-0.04ºC
temp: 295ºC error:-0.04ºC
temp: 296ºC error:-0.04ºC
temp: 297ºC error:-0.03ºC
temp: 298ºC error:-0.03ºC
temp: 299ºC error:-0.03ºC
temp: 300ºC error:-0.03ºC
temp: 301ºC error:-0.03ºC
temp: 302ºC error:-0.03ºC
temp: 303ºC error:-0.03ºC
temp: 304ºC error:-0.01ºC
temp: 305ºC error:-0.02ºC
temp: 306ºC error:-0.02ºC
temp: 307ºC error:-0.00ºC
temp: 308ºC error:-0.01ºC
temp: 309ºC error:-0.01ºC
temp: 310ºC error:-0.00ºC
temp: 311ºC error:-0.01ºC
temp: 312ºC error:-0.00ºC
temp: 313ºC error:0.01ºC
temp: 314ºC error:0.00ºC
temp: 315ºC error:0.01ºC
temp: 316ºC error:0.01ºC
temp: 317ºC error:0.02ºC
temp: 318ºC error:0.01ºC
temp: 319ºC error:0.01ºC
temp: 320ºC error:0.02ºC
temp: 321ºC error:0.02ºC
temp: 322ºC error:0.02ºC
temp: 323ºC error:0.03ºC
temp: 324ºC error:0.03ºC
temp: 325ºC error:0.03ºC
temp: 326ºC error:0.05ºC
temp: 327ºC error:0.04ºC
temp: 328ºC error:0.04ºC
temp: 329ºC error:0.04ºC
temp: 330ºC error:0.05ºC
temp: 331ºC error:0.05ºC
temp: 332ºC error:0.05ºC
temp: 333ºC error:0.06ºC
temp: 334ºC error:0.05ºC
temp: 335ºC error:0.06ºC
temp: 336ºC error:0.05ºC
temp: 337ºC error:0.06ºC
temp: 338ºC error:0.07ºC
temp: 339ºC error:0.06ºC
temp: 340ºC error:0.07ºC
temp: 341ºC error:0.07ºC
temp: 342ºC error:0.08ºC
temp: 343ºC error:0.08ºC
temp: 344ºC error:0.07ºC
temp: 345ºC error:0.07ºC
temp: 346ºC error:0.07ºC
temp: 347ºC error:0.07ºC
temp: 348ºC error:0.08ºC
temp: 349ºC error:0.09ºC
temp: 350ºC error:0.09ºC
temp: 351ºC error:0.09ºC
temp: 352ºC error:0.08ºC
temp: 353ºC error:0.08ºC
temp: 354ºC error:0.09ºC
temp: 355ºC error:0.09ºC
temp: 356ºC error:0.08ºC
temp: 357ºC error:0.09ºC
temp: 358ºC error:0.08ºC
temp: 359ºC error:0.09ºC
temp: 360ºC error:0.08ºC
temp: 361ºC error:0.09ºC
temp: 362ºC error:0.08ºC
temp: 363ºC error:0.08ºC
temp: 364ºC error:0.09ºC
temp: 365ºC error:0.07ºC
temp: 366ºC error:0.07ºC
temp: 367ºC error:0.08ºC
temp: 368ºC error:0.08ºC
temp: 369ºC error:0.08ºC
temp: 370ºC error:0.07ºC
temp: 371ºC error:0.07ºC
temp: 372ºC error:0.07ºC
temp: 373ºC error:0.06ºC
temp: 374ºC error:0.06ºC
temp: 375ºC error:0.05ºC
temp: 376ºC error:0.05ºC
temp: 377ºC error:0.04ºC
temp: 378ºC error:0.03ºC
temp: 379ºC error:0.02ºC
temp: 380ºC error:0.02ºC
temp: 381ºC error:0.01ºC
temp: 382ºC error:-0.00ºC
temp: 383ºC error:0.00ºC
temp: 384ºC error:-0.01ºC
temp: 385ºC error:-0.03ºC
temp: 386ºC error:-0.03ºC
temp: 387ºC error:-0.05ºC
temp: 388ºC error:-0.05ºC
temp: 389ºC error:-0.07ºC
temp: 390ºC error:-0.07ºC
temp: 391ºC error:-0.08ºC
temp: 392ºC error:-0.10ºC
temp: 393ºC error:-0.11ºC
temp: 394ºC error:-0.12ºC
temp: 395ºC error:-0.15ºC
temp: 396ºC error:-0.16ºC
temp: 397ºC error:-0.17ºC
temp: 398ºC error:-0.20ºC
temp: 399ºC error:-0.21ºC