Geokon 4200ER, Instruction Manual

Page: 22 / 22

16
APPENDIX C - HIGH-TEMPERATURE THERMISTOR LINEARIZATION
Resistance to Temperature Equation for
US Sensor 103JL1A
:
2 . 273
) ( ) ( ) (
1
5 3

  

LnR D LnR C LnR B A
T
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
(Coefficients optimized for a curve “J” Thermistor over the temperature
range of 0
°
C to +250
°
C.)
Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp
32,650
0
7,402
32
2,157
64
763.5
96
316.6
128
148.4
160
76.5
192
42.8
224
31,029
1
7,098
33
2,083
65
741.2
97
308.7
129
145.1
161
75.0
193
42.1
225
29,498
2
6,808
34
2,011
66
719.6
98
301.0
130
142.0
162
73.6
194
41.4
226
28,052
3
6,531
35
1,942
67
698.7
99
293.5
131
138.9
163
72.2
195
40.7
227
26,685
4
6,267
36
1,876
68
678.6
100
286.3
132
135.9
164
70.8
196
40.0
228
25,392
5
6,015
37
1,813
69
659.1
101
279.2
133
133.0
165
69.5
197
39.3
229
24,170
6
5,775
38
1,752
70
640.3
102
272.4
134
130.1
166
68.2
198
38.7
230
23,013
7
5,545
39
1,693
71
622.2
103
265.8
135
127.3
167
66.9
199
38.0
231
21,918
8
5,326
40
1,637
72
604.6
104
259.3
136
124.6
168
65.7
200
37.4
232
20,882
9
5,117
41
1,582
73
587.6
105
253.1
137
122.0
169
64.4
201
36.8
233
19,901
10
4,917
42
1,530
74
571.2
106
247.0
138
119.4
170
63.3
202
36.2
234
18,971
11
4,725
43
1,480
75
555.3
107
241.1
139
116.9
171
62.1
203
35.6
235
18,090
12
4,543
44
1,432
76
539.9
108
235.3
140
114.5
172
61.0
204
35.1
236
17,255
13
4,368
45
1,385
77
525.0
109
229.7
141
112.1
173
59.9
205
34.5
237
16,463
14
4,201
46
1,340
78
510.6
110
224.3
142
109.8
174
58.8
206
33.9
238
15,712
15
4,041
47
1,297
79
496.7
111
219.0
143
107.5
175
57.7
207
33.4
239
14,999
16
3,888
48
1,255
80
483.2
112
213.9
144
105.3
176
56.7
208
32.9
240
14,323
17
3,742
49
1,215
81
470.1
113
208.9
145
103.2
177
55.7
209
32.3
241
13,681
18
3,602
50
1,177
82
457.5
114
204.1
146
101.1
178
54.7
210
31.8
242
13,072
19
3,468
51
1,140
83
445.3
115
199.4
147
99.0
179
53.7
211
31.3
243
12,493
20
3,340
52
1,104
84
433.4
116
194.8
148
97.0
180
52.7
212
30.8
244
11,942
21
3,217
53
1,070
85
421.9
117
190.3
149
95.1
181
51.8
213
30.4
245
11,419
22
3,099
54
1,037
86
410.8
118
186.1
150
93.2
182
50.9
214
29.9
246
10,922
23
2,986
55
1,005
87
400.0
119
181.9
151
91.3
183
50.0
215
29.4
247
10,450
24
2,878
56
973.8
88
389.6
120
177.7
152
89.5
184
49.1
216
29.0
248
10,000 25
2,774
57
944.1
89
379.4
121
173.7
153
87.7
185
48.3
217
28.5
249
9,572
26
2,675
58
915.5
90
369.6
122
169.8
154
86.0
186
47.4
218
28.1
250
9,165
27
2,579
59
887.8
91
360.1
123
166.0
155
84.3
187
46.6
219
8,777
28
2,488
60
861.2
92
350.9
124
162.3
156
82.7
188
45.8
220
8,408
29
2,400
61
835.4
93
341.9
125
158.6
157
81.1
189
45.0
221
8,057
30
2,316
62
810.6
94
333.2
126
155.1
158
79.5
190
44.3
222
7,722
31
2,235
63
786.6
95
324.8
127
151.7
159
78.0
191
43.5
223
Table B-2: High Temperature Thermistor Resistance versus Temperature.