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10-7. 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 kΩ ± 3%
B constant = 3480 ± 2%
1
R
=15exp{3480(
–
t
273+t
0°C 15 kΩ
30°C
10°C 9.6 kΩ
40°C
20°C 6.3 kΩ
25°C 5.2 kΩ
Medium temperature thermistor
• Thermistor <Heat sink> (TH8)
Thermistor R50 = 17 kΩ ± 2%
B constant = 4150 ± 3%
1
=17exp{4150( 273+t – 323 )}
R
t
0°C 180 kΩ
25°C
50 kΩ
50°C
17 kΩ
70°C
8 kΩ
90°C
4 kΩ
High temperature thermistor
• Thermistor <Discharge> (TH4)
• Thermistor <Comp. surface> (TH33)
Thermistor R120 = 7.465 kΩ ± 2%
B constant = 4057 ± 2%
1
=7.465exp{4057( 273+t – 393 )}
R
t
20°C 250 kΩ
70°C
30°C 160 kΩ
80°C
40°C 104 kΩ
90°C 17.5 kΩ
50°C 70 kΩ
100°C 13.0 kΩ
60°C 48 kΩ
110°C 9.8 kΩ
OCH653C
1
)}
273
4.3 kΩ
3.0 kΩ
1
1
34 kΩ
24 kΩ
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
200
150
100
50
0
500
400
300
200
100
0
61
Temperature (:)
25
50
75
100
125
Temperature (:)
50
75
100
25
Temperature (:)
120
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