14
Controls & Systems
Models 358 & 359
Thermistor Curve
F
C
K OHM
F
C
K OHM
F
C
K OHM
-10
-23.3
118.201
22
-5.5
43.530
54
12.2
17.915
-9
-22.7
114.394
23
-5.0
42.340
55
12.7
17.451
-8
-22.2
110.709
24
-4.4
41.136
56
13.3
16.998
-7
-21.6
107.143
25
-3.8
39.967
57
13.8
16.557
-6
-21.1
103.692
26
-3.3
38.830
58
14.4
16.128
-5
-20.5
100.352
27
-2.7
37.727
59
15.0
15.710
-4
-20.0
97.120
28
-2.2
36.654
60
15.5
15.315
-3
-19.4
94.085
29
-1.6
35.612
61
16.1
14.929
-2
-18.8
91.144
30
-1.1
34.599
62
16.6
14.554
-1
-18.3
88.296
31
-0.5
33.616
63
17.2
14.187
0
-17.7
85.536
32
0
32.660
64
17.7
13.830
1
-17.2
82.863
33
0.5
31.760
65
18.3
13.482
2
-16.6
80.273
34
1.1
30.885
66
18.8
13.143
3
-16.1
77.765
35
1.6
30.035
67
19.4
12.812
4
-15.5
75.334
36
2.2
29.207
68
20.0
12.490
5
-15.0
72.980
37
2.7
28.403
69
20.5
12.185
6
-14.4
70.627
38
3.3
27.620
70
21.1
11.888
7
-13.8
68.350
39
3.8
26.859
71
21.6
11.598
8
-13.3
66.147
40
4.4
26.120
72
22.2
11.315
9
-12.7
64.014
41
5.0
25.400
73
22.7
11.039
10
-12.2
61.951
42
5.5
24.721
74
23.3
10.769
11
-11.6
59.953
43
6.1
24.059
75
23.8
10.507
12
-11.1
58.021
44
6.6
23.416
76
24.4
10.250
13
-10.5
56.150
45
7.2
22.789
77
25.0
10.000
14
-10.0
54.340
46
7.7
22.180
78
25.5
9.763
15
-9.4
52.854
47
8.3
21.586
79
26.1
9.532
16
-8.8
51.409
48
8.8
21.009
80
26.6
9.306
17
-8.3
50.003
49
9.4
20.447
81
27.2
9.085
18
-7.7
48.636
50
10.0
19.900
82
27.7
8.870
19
-7.2
47.306
51
10.5
19.384
83
28.3
8.659
20
-6.6
46.012
52
11.1
18.881
84
28.8
8.454
21
-6.1
44.754
53
11.6
18.392
85
29.4
8.254
When checking a thermistor probe, first determine the temperature at the probe and find it on this chart, along with the correct
ohmmeter reading. If your ohmmeter reading varies from the correct reading, determine whether the difference is acceptable. If
a probe is faulty, the difference will be great.
