Appendix C: Thermistor Temp/Resist Chart - Grundfos Geo-Flo Universal Pump Controller Installation, Operating And Maintenance Manual

Appendix C: Thermistor Temperature/Resistance Chart
Temp Temp Resistance
(°F) (°C) (Ω)
20.0 -6.7 46,195
21.0 -6.1 44,863
22.0 -5.6 43,574
23.0 -5.0 42,326
24.0 -4.5 41,119
25.0 -3.9 39,949
26.0 -3.4 38,817
27.0 -2.8 37,720
28.0 -2.3 36,658
28.0 -2.2 36,564
29.0 -1.7 35,538
30.0 -1.1 34,545
31.0 -0.6 33,582
32.0 0.0 32,650
33.0 0.6 31,747
34.0 1.1 30,872
35.0 1.7 30,024
36.0 2.2 29,203
37.0 2.8 28,406
38.0 3.4 27,565
39.0 3.9 26,818
40.0 4.5 26,094
41.0 5.0 25,392
42.0 5.6 24,711
43.0 6.1 24,051
44.0 6.7 23,411
45.0 7.2 22,789
46.0 7.8 22,186
47.0 8.4 21,549
48.0 8.9 20,983
49.0 9.5 20,434
50.0 10.0 19,901
51.0 10.6 19,383
52.0 11.1 18,881
53.0 11.7 18,393
54.0 12.2 17,919
55.0 12.8 17,459
56.0 13.4 16,973
57.0 13.9 16,540
58.0 14.5 16,120
59.0 15.0 15,712
60.0 15.6 15,315
GEO-FLO UNIVERSAL PUMP CONTROLLER: UPC-GEO | 21
RESISTANCE VS. TEMPERATURE CHART
10K THERMISTOR*, UPC GEO
Temp Temp Resistance
(°F) (°C)
61.0 16.1
62.0 16.7
63.0 17.2
64.0 17.8
65.0 18.4
66.0 18.9
67.0 19.5
68.0 20.0
69.0 20.6
70.0 21.1
71.0 21.7
72.0 22.2
73.0 22.8
74.0 23.4
75.0 23.9
76.0 24.5
77.0 25.0
78.0 25.6
79.0 26.1
80.0 26.7
81.0 27.2
82.0 27.8
83.0 28.4
84.0 28.9
85.0 29.5
86.0 30.0
87.0 30.6
88.0 31.1
89.0 31.7
90.0 32.2
91.0 32.8
92.0 33.4
93.0 33.9
94.0 34.5
95.0 35.0
96.0 35.6
97.0 36.1
98.0 36.7
99.0 37.2
100.0 37.8
101.0 38.4
102.0 38.9
Temp Temp
(Ω) (°F) (°C)
14,930 103.0 39.5
14,556 104.0 40.0
14,192 105.0 40.6
13,839 106.0 41.1
13,464 107.0 41.7
13,131 108.0 42.2
12,807 109.0 42.8
12,493 110.0 43.4
12,186 111.0 43.9
11,889 112.0 44.5
11,599 113.0 45.0
11,318 114.0 45.6
11,044 115.0 46.1
10,754 116.0 46.7
10,496 117.0 47.2
10,245 118.0 47.8
10,000 119.0 48.4
9,762 120.0 48.9
9,531
9,305 *10k resistor is 10kΩ
9,086 at 25°C (77°F).
8,872 Resistance goes down
8,646 as temperature goes
8,444 up.
8,248
8,057
7,870
7,689
7,512
7,340
7,173
6,995
6,836
6,682
6,531
6,384
6,241
6,102
5,966
5,834
5,693
5,568
Resistance
(Ω)
5,445
5,326
5,210
5,096
4,986
4,878
4,772
4,661
4,561
4,463
4,368
4,275
4,185
4,096
4,010
3,926
3,836
3,756