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9-7. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <2-phase pipe> (TH6)
• Thermistor <Ambient> (TH7)
Thermistor R0 = 15 k" ± 3 %
B constant = 3480 ± 2 %
1
R
=15exp{3480(
–
t
273+t
0°C
15 k"
30°C
10°C
9.6 k"
40°C
20°C
6.3 k"
25°C
5.2 k"
Medium temperature thermistor
• Thermistor <Heatsink> (TH8)
Thermistor R50 = 17 k" ± 2 %
B constant = 4150 ± 3 %
1
=17exp{4150( 273+t – 323 )}
R
t
0°C 180 k"
25°C
50 k"
50°C
17 k"
70°C
8 k"
90°C
4 k"
High temperature thermistor
• Thermistor <Discharge> (TH4)
• Thermistor <Comp. surface> (TH33)
Thermistor R120 = 7.465 k" ± 2%
B constant = 4057 ± 2%
1
=7.465exp{4057( 273+t – 393 )}
R
t
20°C 250 k"
70°C
30°C 160 k"
80°C
40°C 104 k"
90°C
50°C
70 k"
100°C
60°C
48 k"
110°C
OCH708
1
)}
273
4.3 k"
3.0 k"
1
1
34 k"
24 k"
17.5 k"
13.0 k"
9.8 k"
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature (:)
200
150
100
50
0
25
Temperature (:)
500
400
300
200
100
0
25
Temperature (:)
62
50
75
100
125
50
75
100
120
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