Newport 8000 - Table 6 - Comparison of Curve Fitting Equations; Figure 27 - Thermistor Resistance Versus Temperature

Chapter 4 Temperature Controller Module Operation 57
Figure 27 - Thermistor Resistance versus Temperature
---------Error T (°C)----------
R
1
T Actual First
Order
Fit. Eq. 2
2
Third Order
Fit. Eq. 1
3
97072
-20.00 -0.00 -0.32
55326 -10.00 0.00 -0.06
32650
0.00 -0.00 0.09
19899
10.00 -0.00 0.15
12492
20.00 -0.00 0.13
10000
25.00 0.00 0.08
8057
30.00 0.00 0.01
5326
40.00 0.00 -0.20
3602
50.00 -0.00 -0.50
Table 6 - Comparison of Curve Fitting Equations
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:
C1 = A * 10
+3
1
Resistance of a 10K, Fenwal UUA41J1 thermistor.
2
Constants A' = 0.963 * 10
-3
, B' = 2.598 * 10
-4
3
Constants A = 1.125 * 10
-3
(C1 = 1.125)
B = 2.347 * 10
-4
(C2 = 2.347)
C = 0.855 * 10
-7
(C3 = 0.855)
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