51
Thermistor Type: Thermometrics BR55KA822J
Resistance to Temperature Equation:
T=
1
A+B
(
LnR
)
+C(LnR)
3
-273.2
Equation 6 - Convert Thermistor, Type BR55KA822J, Resistance to Temperature
Where: T
=
Temperature in
°
C.
LnR
=
Natural Log of Thermistor Resistance
A
=
1.02569
×
10-3
B
=
2.478265
×
10-4
C
=
1.289498
×
10-7
Note
: Coefficients calculated over -30
°
to +260
°
C. span.
Table 15 - BR55KA822J Thermistor Resistance versus Temperature
Temp
R
(ohms)
LnR
LnR
3
Calculated
Temp
Diff
FS Error Temp
R
(ohms)
LnR
LnR
3
Calculated
Temp
Diff
FS Error
-30
113898
11.643
1578.342
-30.17
0.17
0.06
120
407.62
6.010
217.118
120.00
0.00
0.00
-25
86182
11.364
1467.637
-25.14
0.14
0.05
125
360.8
5.888
204.162
125.00
0.00
0.00
-20
65805
11.094
1365.581
-20.12
0.12
0.04
130
320.21
5.769
191.998
130.00
0.00
0.00
-15
50684.2
10.833
1271.425
-15.10
0.10
0.03
135
284.95
5.652
180.584
135.00
0.00
0.00
-10
39360
10.581
1184.457
-10.08
0.08
0.03
140
254.2
5.538
169.859
140.01
-0.01
0.00
-5
30807.4
10.336
1104.068
-5.07
0.07
0.02
145
227.3
5.426
159.773
145.02
-0.02
-0.01
0
24288.4
10.098
1029.614
-0.05
0.05
0.02
150
203.77
5.317
150.314
150.03
-0.03
-0.01
5
19294.6
9.868
960.798
4.96
0.04
0.01
155
183.11
5.210
141.428
155.04
-0.04
-0.01
10
15424.2
9.644
896.871
9.98
0.02
0.01
160
164.9
5.105
133.068
160.06
-0.06
-0.02
15
12423
9.427
837.843
14.98
0.02
0.01
165
148.83
5.003
125.210
165.08
-0.08
-0.03
20
10061.4
9.216
782.875
19.99
0.01
0.00
170
134.64
4.903
117.837
170.09
-0.09
-0.03
25
8200
9.012
731.893
25.00
0.00
0.00
175
122.1
4.805
110.927
175.08
-0.08
-0.03
30
6721.54
8.813
684.514
30.01
-0.01
0.00
180
110.95
4.709
104.426
180.07
-0.07
-0.02
35
5540.74
8.620
640.478
35.01
-0.01
0.00
185
100.94
4.615
98.261
185.10
-0.10
-0.04
40
4592
8.432
599.519
40.02
-0.02
-0.01
190
92.086
4.523
92.512
190.09
-0.09
-0.03
45
3825.3
8.249
561.392
45.02
-0.02
-0.01
195
84.214
4.433
87.136
195.05
-0.05
-0.02
50
3202.92
8.072
525.913
50.01
-0.01
-0.01
200
77.088
4.345
82.026
200.05
-0.05
-0.02
55
2693.7
7.899
492.790
55.02
-0.02
-0.01
205
70.717
4.259
77.237
205.02
-0.02
-0.01
60
2276.32
7.730
461.946
60.02
-0.02
-0.01
210
64.985
4.174
72.729
210.00
0.00
0.00
65
1931.92
7.566
433.157
65.02
-0.02
-0.01
215
59.819
4.091
68.484
214.97
0.03
0.01
70
1646.56
7.406
406.283
70.02
-0.02
-0.01
220
55.161
4.010
64.494
219.93
0.07
0.02
75
1409.58
7.251
381.243
75.01
-0.01
0.00
225
50.955
3.931
60.742
224.88
0.12
0.04
80
1211.14
7.099
357.808
80.00
0.00
0.00
230
47.142
3.853
57.207
229.82
0.18
0.06
85
1044.68
6.951
335.915
85.00
0.00
0.00
235
43.673
3.777
53.870
234.77
0.23
0.08
90
903.64
6.806
315.325
90.02
-0.02
-0.01
240
40.533
3.702
50.740
239.69
0.31
0.11
95
785.15
6.666
296.191
95.01
-0.01
0.00
245
37.671
3.629
47.788
244.62
0.38
0.13
100
684.37
6.528
278.253
100.00
0.00
0.00
250
35.055
3.557
45.001
249.54
0.46
0.16
105
598.44
6.394
261.447
105.00
0.00
0.00
255
32.677
3.487
42.387
254.44
0.56
0.19
110
524.96
6.263
245.705
110.00
0.00
0.00
260
30.496
3.418
39.917
259.34
0.66
0.23
115
461.91
6.135
230.952
115.00
0.00
0.00