10
| THERMISTOR TEMPERATURE DERIVATION | GEOKON
APPENDIX B.
THERMISTOR TEMPERATURE
DERIVATION
B.1 THERMISTOR RESISTANCE FOR 3KΩ
Thermistor Types:
■
YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3
■
Honeywell 192-302LET-A01
Resistance to Temperature Equation:
EQUATION 1:
Thermistor Resistance for 3kΩ
Where:
T
= Temperature in °C
LnR
= Natural Log of Thermistor Resistance
A
= 1.4051 x 10
-3
B
= 2.369 x 10
-4
C
= 1.019 x 10
-7
Note:
Coefficients calculated over the -50 to +150
C span.
TABLE 7:
Thermistor Resistance for 3kΩ
T =
1
– 273.15
A+B(LnR)+C(LnR
3
)
Ohms
Temp
Ohms
Temp
Ohms
Temp
Ohms
Temp
Ohms
Temp
201.1K
-50
15.72K
-9
2221
32
474.7
73
137.2
114
187.3K
-49
14.90K
-8
2130
33
459.0
74
133.6
115
174.5K
-48
14.12K
-7
2042
34
444.0
75
130.0
116
162.7K
-47
13.39K
-6
1959
35
429.5
76
126.5
117
151.7K
-46
12.70K
-5
1880
36
415.6
77
123.2
118
141.6K
-45
12.05K
-4
1805
37
402.2
78
119.9
119
132.2K
-44
11.44K
-3
1733
38
389.3
79
116.8
120
123.5K
-43
10.86K
-2
1664
39
376.9
80
113.8
121
115.4K
-42
10.31K
-1
1598
40
364.9
81
110.8
122
107.9K
-41
9796
0
1535
41
353.4
82
107.9
123
101.0K
-40
9310
1
1475
42
342.2
83
105.2
124
94.48K
-39
8851
2
1418
43
331.5
84
102.5
125
88.46K
-38
8417
3
1363
44
321.2
85
99.9
126
82.87K
-37
8006
4
1310
45
311.3
86
97.3
127
77.66K
-36
7618
5
1260
46
301.7
87
94.9
128
72.81K
-35
7252
6
1212
47
292.4
88
92.5
129
68.30K
-34
6905
7
1167
48
283.5
89
90.2
130
64.09K
-33
6576
8
1123
49
274.9
90
87.9
131
60.17K
-32
6265
9
1081
50
266.6
91
85.7
132
56.51K
-31
5971
10
1040
51
258.6
92
83.6
133
53.10K
-30
5692
11
1002
52
250.9
93
81.6
134
49.91K
-29
5427
12
965.0
53
243.4
94
79.6
135
46.94K
-28
5177
13
929.6
54
236.2
95
77.6
136
44.16K
-27
4939
14
895.8
55
229.3
96
75.8
137
41.56K
-26
4714
15
863.3
56
222.6
97
73.9
138
39.13K
-25
4500
16
832.2
57
216.1
98
72.2
139
36.86K
-24
4297
17
802.3
58
209.8
99
70.4
140
34.73K
-23
4105
18
773.7
59
203.8
100
68.8
141
32.74K
-22
3922
19
746.3
60
197.9
101
67.1
142
30.87K
-21
3748
20
719.9
61
192.2
102
65.5
143
29.13K
-20
3583
21
694.7
62
186.8
103
64.0
144
27.49K
-19
3426
22
670.4
63
181.5
104
62.5
145
25.95K
-18
3277
23
647.1
64
176.4
105
61.1
146
24.51K
-17
3135
24
624.7
65
171.4
106
59.6
147
23.16K
-16
3000
25
603.3
66
166.7
107
58.3
148
21.89K
-15
2872
26
582.6
67
162.0
108
56.8
149
20.70K
-14
2750
27
562.8
68
157.6
109
55.6
150
19.58K
-13
2633
28
543.7
69
153.2
110
18.52K
-12
2523
29
525.4
70
149.0
111
17.53K
-11
2417
30
507.8
71
145.0
112
16.60K
-10
2317
31
490.9
72
141.1
113
