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APPENDIX C. HIGH TEMPERATURE THERMISTOR LINEARIZATION
Resistance to Temperature Equation for US Sensor 103JL1A:
Where;
T = Temperature in °C.
LnR = Natural Log of Thermistor Resistance.
A = 1.127670 × 10 -3
B = 2.344442 × 10 -4
C = 8.476921 × 10 -8
D = 1.175122 × 10 -11
Note: Coefficients optimized for a curve "J" Thermistor over the temperature range of 0°C to
+250°C.
Ohms
Temp
Ohms
Temp
32,650
0
7,402
32
31,029
1
7,098
33
29,498
2
6,808
34
28,052
3
6,531
35
26,685
4
6,267
36
25,392
5
6,015
37
24,170
6
5,775
38
23,013
7
5,545
39
21,918
8
5,326
40
20,882
9
5,117
41
19,901
10
4,917
42
18,971
11
4,725
43
18,090
12
4,543
44
17,255
13
4,368
45
16,463
14
4,201
46
15,712
15
4,041
47
14,999
16
3,888
48
14,323
17
3,742
49
13,681
18
3,602
50
13,072
19
3,468
51
12,493
20
3,340
52
11,942
21
3,217
53
11,419
22
3,099
54
10,922
23
2,986
55
10,450
24
2,878
56
10,000
25
2,774
57
9,572
26
2,675
58
9,165
27
2,579
59
8,777
28
2,488
60
8,408
29
2,400
61
8,057
30
2,316
62
7,722
31
2,235
63
Table 7 - Thermistor Resistance versus Temperature for High Temperature Models
A+B ( LnR ) +C(LnR)
T=
Equation 6 - High Temperature Resistance to Temperature
Ohms
Temp
Ohms
2,157
64
763.5
2,083
65
741.2
2,011
66
719.6
1,942
67
698.7
1,876
68
678.6
1,813
69
659.1
1,752
70
640.3
1,693
71
622.2
1,637
72
604.6
1,582
73
587.6
1,530
74
571.2
1,480
75
555.3
1,432
76
539.9
1,385
77
525.0
1,340
78
510.6
1,297
79
496.7
1,255
80
483.2
1,215
81
470.1
1,177
82
457.5
1,140
83
445.3
1,104
84
433.4
1,070
85
421.9
1,037
86
410.8
1,005
87
400.0
973.8
88
389.6
944.1
89
379.4
915.5
90
369.6
887.8
91
360.1
861.2
92
350.9
835.4
93
341.9
810.6
94
333.2
786.6
95
324.8
1
3
3
+D(LnR)
Temp
Ohms
Temp
Ohms
96
316.6
128
148.4
97
308.7
129
145.1
98
301.0
130
142.0
99
293.5
131
138.9
100
286.3
132
135.9
101
279.2
133
133.0
102
272.4
134
130.1
103
265.8
135
127.3
104
259.3
136
124.6
105
253.1
137
122.0
106
247.0
138
119.4
107
241.1
139
116.9
108
235.3
140
114.5
109
229.7
141
112.1
110
224.3
142
109.8
111
219.0
143
107.5
112
213.9
144
105.3
113
208.9
145
103.2
114
204.1
146
101.1
115
199.4
147
99.0
116
194.8
148
97.0
117
190.3
149
95.1
118
186.1
150
93.2
119
181.9
151
91.3
120
177.7
152
89.5
121
173.7
153
87.7
122
169.8
154
86.0
123
166.0
155
84.3
124
162.3
156
82.7
125
158.6
157
81.1
126
155.1
158
79.5
127
151.7
159
78.0
-273.2
Temp
Ohms
Temp
Ohms
160
76.5
192
42.8
161
75.0
193
42.1
162
73.6
194
41.4
163
72.2
195
40.7
164
70.8
196
40.0
165
69.5
197
39.3
166
68.2
198
38.7
167
66.9
199
38.0
168
65.7
200
37.4
169
64.4
201
36.8
170
63.3
202
36.2
171
62.1
203
35.6
172
61.0
204
35.1
173
59.9
205
34.5
174
58.8
206
33.9
175
57.7
207
33.4
176
56.7
208
32.9
177
55.7
209
32.3
178
54.7
210
31.8
179
53.7
211
31.3
180
52.7
212
30.8
181
51.8
213
30.4
182
50.9
214
29.9
183
50.0
215
29.4
184
49.1
216
29.0
185
48.3
217
28.5
186
47.4
218
28.1
187
46.6
219
188
45.8
220
189
45.0
221
190
44.3
222
191
43.5
223
29
Temp
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
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