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Chapter 4
In practice we have found that the constants A, B and C for virtually all common
thermistors lie within a narrow range. Consequently, we have defined the constants
C1, C2, C3 as follows:
1
Resistance of a 10K, Fenwal UUA41J1 thermistor.
2
Constants A' = 0.963 * 10
3
Constants
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Temperature Controller Module Operation
Figure 27 - Thermistor Resistance versus Temperature
---------Error T (°C)----------
1
R
T Actual
97072
-20.00
55326
-10.00
32650
0.00
19899
10.00
12492
20.00
10000
25.00
8057
30.00
5326
40.00
3602
50.00
Table 6 - Comparison of Curve Fitting Equations
-3
-4
, B' = 2.598 * 10
-3
A = 1.125 * 10
(C1 = 1.125)
-4
B = 2.347 * 10
(C2 = 2.347)
-7
C = 0.855 * 10
(C3 = 0.855)
First
Third Order
Order
Fit. Eq. 1
2
Fit. Eq. 2
-0.00
0.00
-0.00
-0.00
-0.00
0.00
0.00
0.00
-0.00
+3
C1 = A * 10
3
-0.32
-0.06
0.09
0.15
0.13
0.08
0.01
-0.20
-0.50
57
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