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24 | THERMISTOR TEMPERATURE DERIVATION | GEOKON
APPENDIX C.
THERMISTOR TEMPERATURE
DERIVATION
Thermistor type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3
Resistance to Temperature Equation:
EQUATION 8: Resistance to Temperature
Where:
T = Temperature in °C
LnR = Natural Log of Thermistor Resistance
-3
A = 1.4051 x 10
-4
B = 2.369 x 10
-7
C = 1.019 x 10
Note: Coefficients calculated over the -50 to +150 °C span.
Ohms
Temp
Ohms
Temp
201.1K
-50
16.60K
-10
187.3K
-49
15.72K
-9
174.5K
-48
14.90K
-8
162.7K
-47
14.12K
-7
151.7K
-46
13.39K
-6
141.6K
-45
12.70K
-5
132.2K
-44
12.05K
-4
123.5K
-43
11.44K
-3
115.4K
-42
10.86K
-2
107.9K
-41
10.31K
-1
101.0K
-40
9796
0
94.48K
-39
9310
+1
88.46K
-38
8851
2
82.87K
-37
8417
3
77.66K
-36
8006
4
72.81K
-35
7618
5
68.30K
-34
7252
6
64.09K
-33
6905
7
60.17K
-32
6576
8
56.51K
-31
6265
9
53.10K
-30
5971
10
49.91K
-29
5692
11
46.94K
-28
5427
12
44.16K
-27
5177
13
41.56K
-26
4939
14
39.13K
-25
4714
15
36.86K
-24
4500
16
34.73K
-23
4297
17
32.74K
-22
4105
18
30.87K
-21
3922
19
29.13K
-20
3748
20
27.49K
-19
3583
21
25.95K
-18
3426
22
24.51K
-17
3277
23
23.16K
-16
3135
24
21.89K
-15
3000
25
20.70K
-14
2872
26
19.58K
-13
2750
27
18.52K
-12
2633
28
17.53K
-11
2523
29
TABLE 11: Thermistor Resistance versus Temperature
Ohms
Temp
Ohms
Temp
2417
+30
525.4
+70
2317
31
507.8
71
2221
32
490.9
72
2130
33
474.7
73
2042
34
459.0
74
1959
35
444.0
75
1880
36
429.5
76
1805
37
415.6
77
1733
38
402.2
78
1664
39
389.3
79
1598
40
376.9
80
1535
41
364.9
81
1475
42
353.4
82
1418
43
342.2
83
1363
44
331.5
84
1310
45
321.2
85
1260
46
311.3
86
1212
47
301.7
87
1167
48
292.4
88
1123
49
283.5
89
1081
50
274.9
90
1040
51
266.6
91
1002
52
258.6
92
965.0
53
250.9
93
929.6
54
243.4
94
895.8
55
236.2
95
863.3
56
229.3
96
832.2
57
222.6
97
802.3
58
216.1
98
773.7
59
209.8
99
746.3
60
203.8
100
719.9
61
197.9
101
694.7
62
192.2
102
670.4
63
186.8
103
647.1
64
181.5
104
624.7
65
176.4
105
603.3
66
171.4
106
582.6
67
166.7
107
562.8
68
162.0
108
543.7
69
157.6
109
Ohms
Temp
153.2
+110
149.0
111
145.0
112
141.1
113
137.2
114
133.6
115
130.0
116
126.5
117
123.2
118
119.9
119
116.8
120
113.8
121
110.8
122
107.9
123
105.2
124
102.5
125
99.9
126
97.3
127
94.9
128
92.5
129
90.2
130
87.9
131
85.7
132
83.6
133
81.6
134
79.6
135
77.6
136
75.8
137
73.9
138
72.2
139
70.4
140
68.8
141
67.1
142
65.5
143
64.0
144
62.5
145
61.1
146
59.6
147
58.3
148
56.8
149
55.6
150
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