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22
APPENDIX B. THERMISTOR TEMPERATURE DERIVATION
Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3
Resistance to Temperature Equation:
Where;
T = Temperature in °C.
LnR = Natural Log of Thermistor Resistance
A = 1.4051 × 10 -3
B = 2.369 × 10 -4
C = 1.019 × 10 -7
Note: Coefficients calculated over the −50 to +150° C. span.
Ohms
Temp
201.1K
-50
187.3K
-49
174.5K
-48
162.7K
-47
151.7K
-46
141.6K
-45
132.2K
-44
123.5K
-43
115.4K
-42
107.9K
-41
101.0K
-40
94.48K
-39
88.46K
-38
82.87K
-37
77.66K
-36
72.81K
-35
68.30K
-34
64.09K
-33
60.17K
-32
56.51K
-31
53.10K
-30
49.91K
-29
46.94K
-28
44.16K
-27
41.56K
-26
39.13K
-25
36.86K
-24
34.73K
-23
32.74K
-22
30.87K
-21
29.13K
-20
27.49K
-19
25.95K
-18
24.51K
-17
23.16K
-16
21.89K
-15
20.70K
-14
19.58K
-13
18.52K
-12
17.53K
-11
Table 5 - Thermistor Resistance Versus Temperature
A+B ( LnR ) +C(LnR)
T=
Equation 2 - Resistance to Temperature
Ohms
Temp
Ohms
16.60K
-10
2417
15.72K
-9
2317
14.90K
-8
2221
14.12K
-7
2130
13.39K
-6
2042
12.70K
-5
1959
12.05K
-4
1880
11.44K
-3
1805
10.86K
-2
1733
10.31K
-1
1664
9796
0
1598
+1
9310
1535
8851
2
1475
8417
3
1418
8006
4
1363
7618
5
1310
7252
6
1260
6905
7
1212
6576
8
1167
6265
9
1123
5971
10
1081
5692
11
1040
5427
12
1002
5177
13
965.0
4939
14
929.6
4714
15
895.8
3400
16
863.3
4297
17
832.2
4105
18
802.3
3922
19
773.7
3748
20
746.3
3583
21
719.9
3426
22
694.7
3277
23
670.4
3135
24
647.1
3000
25
624.7
2872
26
603.3
2750
27
582.6
2633
28
562.8
2523
29
543.7
1
-273.2
3
Temp
Ohms
+30
525.4
31
507.8
32
490.9
33
474.7
34
459.0
35
444.0
36
429.5
37
415.6
38
402.2
39
389.3
40
376.9
41
364.9
42
353.4
43
342.2
44
331.5
45
321.2
46
311.3
47
301.7
48
292.4
49
283.5
50
274.9
51
266.6
52
258.6
53
250.9
54
243.4
55
236.2
56
229.3
57
222.6
58
216.1
59
209.8
60
203.8
61
197.9
62
192.2
63
186.8
64
181.5
65
176.4
66
171.4
67
166.7
68
162.0
69
157.6
Temp
Ohms
Temp
+70
+110
153.2
71
149.0
111
72
145.0
112
73
141.1
113
74
137.2
114
75
133.6
115
76
130.0
116
77
126.5
117
78
123.2
118
79
119.9
119
80
116.8
120
81
113.8
121
82
110.8
122
83
107.9
123
84
105.2
124
85
102.5
125
86
99.9
126
87
97.3
127
88
94.9
128
89
92.5
129
90
90.2
130
91
87.9
131
92
85.7
132
93
83.6
133
94
81.6
134
95
79.6
135
96
77.6
136
97
75.8
137
98
73.9
138
99
72.2
139
100
70.4
140
101
68.8
141
102
67.1
142
103
65.5
143
104
64.0
144
105
62.5
145
106
61.1
146
107
59.6
147
108
58.3
148
109
56.8
149
55.6
150
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