Wednesday, September 13, 2017

Eliwell IC901 Plus NTC thermistor probe resistance temperature table

For those who want to know the temperature-resistance data for NTC probe used in Eliwell IC901 digital temperature controller. The following is the data:


Temp [°C] Resistance [kΩ]
-40 188.5
-39 178.5
-38 169
-37 160.2
-36 151.9
-35 144.1
-34 136.7
-33 129.8
-32 123.3
-31 117.1
-30 111.3
-29 105.7
-28 100.5
-27 95.52
-26 90.84
-25 86.43
-24 82.26
-23 78.33
-22 74.61
-21 71.1
-20 67.77
-19 64.57
-18 61.54
-17 58.68
-16 55.97
-15 53.41
-14 50.98
-13 48.68
-12 46.5
-11 44.43
-10 42.47
-9 40.57
-8 38.77
-7 37.06
-6 35.44
-5 33.9
-4 32.44
-3 31.05
-2 29.73
-1 28.48
0 27.28
1 26.13
2 25.03
3 23.99
4 23
5 22.05
6 21.15
7 20.3
8 19.48
9 18.7
10 17.96
11 17.24
12 16.56
13 15.9
14 15.28
15 14.69
16 14.12
17 13.58
18 13.06
19 12.56
20 12.09
21 11.63
22 11.2
23 10.78
24 10.38
25 10
26 9.632
27 9.281
28 8.944
29 8.622
30 8.313
31 8.014
32 7.728
33 7.454
34 7.192
35 6.94
36 6.699
37 6.467
38 6.245
39 6.032
40 5.827
41 5.629
42 5.438
43 5.255
44 5.08
45 4.911
46 4.749
47 4.593
48 4.443
49 4.299
50 4.16
51 4.026
52 3.896
53 3.771
54 3.651
55 3.536
56 3.425
57 3.318
58 3.215
59 3.116
60 3.02
61 2.927
62 2.838
63 2.751
64 2.668
65 2.588
66 2.511
67 2.436
68 2.364
69 2.295
70 2.228
71 2.163
72 2.1
73 2.039
74 1.98
75 1.924
76 1.869
77 1.816
78 1.765
79 1.716
80 1.668
81 1.622
82 1.577
83 1.533
84 1.492
85 1.451
86 1.412
87 1.373
88 1.336
89 1.301
90 1.266
91 1.232
92 1.2
93 1.168
94 1.137
95 1.108
96 1.079
97 1.051
98 1.024
99 0.9984
100 0.9731
101 0.9484
102 0.9246
103 0.9014
104 0.8789
105 0.8572
106 0.836
107 0.8155
108 0.7956
109 0.7763
110 0.7576

Based on the previous data, this NTC sensor can be modeled using very accurate Steinhart-Hart equation with following constants:

T=1/(0.0008895550077+0.000250946909*Ln(1000*R)+0.0000001960216692*(Ln(1000*R))^3)

Where temperature is measured in degrees Kelvin [K] and resistance is measured in kOhm.

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