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Thermistor Sensor
1. Make a visual check for broken wire insulation,
broken wires or cracked epoxy material.
2. Disconnect 10k ohm NTC thermistor from the EEV
control box.
3. Use an ohmmeter to measure the resistance
between the two connectors. Also use ohmmeter to
check for short or open.
Temperature
Resistance
F
C
Ω
-40
-40
188,500
-38.2
-39
178,500
-36.4
-38
169,000
-34.6
-37
160,200
-32.8
-36
151,900
-31
-35
144,100
-29.2
-34
136,700
-27.4
-33
129,800
-25.6
-32
123,300
-23.8
-31
117,100
-22
-30
111,300
-20.2
-29
105,700
-18.4
-28
100,500
-16.6
-27
95,520
-14.8
-26
90,840
-13
-25
86,430
-11.2
-24
82,260
-9.4
-23
78,330
-7.6
-22
74,610
-5.8
-21
71,100
-4
-20
67,770
-2.2
-19
64,570
-0.4
-18
61,540
1.4
-17
58,680
3.2
-16
55,970
5
-15
53,410
6.8
-14
50,980
8.6
-13
48,680
10.4
-12
46,500
12.2
-11
44,430
14
-10
42,470
15.8
-9
40,570
17.6
-8
38,770
19.4
-7
37,060
21.2
-6
35,440
23
-5
33,900
24.8
-4
32,440
26.6
-3
31,050
Manual 7960-923
Page
4 of 10
TABLE 2
10K Ohm NTC Sensor: Temperature/Resistance
Temperature
Resistance
F
C
Ω
28.4
-2
29,730
30.2
-1
28,480
32
0
27,280
33.8
1
26,130
35.6
2
25,030
37.4
3
23,990
39.2
4
23,000
41
5
22,050
42.8
6
21,150
44.6
7
20,300
46.4
8
19,480
48.2
9
18,700
50
10
17,960
51.8
11
17,240
53.6
12
16,560
55.4
13
15,900
57.2
14
15,280
59
15
14,690
60.8
16
14,120
62.6
17
13,580
64.4
18
13,060
66.2
19
12,560
68
20
12,090
69.8
21
11,630
71.6
22
11,200
73.4
23
10,780
75.2
24
10,380
77
25
10,000
78.8
26
9,630
80.6
27
9,280
82.4
28
8,940
84.2
29
8,620
86
30
8,310
87.8
31
8,010
89.6
32
7,730
91.4
33
7,450
93.2
34
7,190
95
35
6,940
4. Compare the resistance reading to Table 2. Use
sensor ambient temperature. (Tolerance of part is
±10 %.)
5. If sensor is out of tolerance, shorted, open or reads
very low ohms, it should be replaced.
Temperature
Resistance
F
C
Ω
96.8
36
6,700
98.6
37
6,470
100.4
38
6,250
102.2
39
6,030
104
40
5,830
105.8
41
5,630
107.6
42
5,440
109.4
43
5,260
111.2
44
5,080
113
45
4,910
114.8
46
4,750
116.6
47
4,590
118.4
48
4,440
120.2
49
4,300
122
50
4,160
123.8
51
4,030
125.6
52
3,900
127.4
53
3,770
129.2
54
3,650
131
55
3,540
132.8
56
3,430
134.6
57
3,320
136.4
58
3,220
138.2
59
3,120
140
60
3,020
141.8
61
2,930
143.6
62
2,840
145.4
63
2,750
147.2
64
2,670
149
65
2,590
150.8
66
2,510
152.6
67
2,440
154.4
68
2,360
156.2
69
2,300
158
70
2,230
159.8
71
2,160
161.6
72
2,100
163.4
73
2,040
Temperature
Resistance
F
C
Ω
165.2
74
1,980
167
75
1,920
168.8
76
1,870
170.6
77
1,820
172.4
78
1,770
174.2
79
1,920
176
80
1,670
177.8
81
1,620
179.6
82
1,580
181.4
83
1,530
183.2
84
1,490
185
85
1,450
186.8
86
1,441
188.6
87
1,370
190.4
88
1,340
192.2
89
1,300
194
90
1,270
195.8
91
1,230
197.6
92
1,200
199.4
93
1,170
201.2
94
1,140
203
95
1,110
204.8
96
1,080
206.6
97
1,050
208.4
98
1,020
210.2
99
1,000
212
100
970
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