47
OCH665B
10-7. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <2-phase pipe> (TH6)
• Thermistor <Ambient> (TH7)
0°C 15 kΩ
10°C 9.6 kΩ
20°C 6.3 kΩ
25°C 5.2 kΩ
0°C 180 kΩ
25°C 50 kΩ
50°C 17 kΩ
70°C
8 kΩ
90°C
4 kΩ
30°C 4.3 kΩ
40°C 3.0 kΩ
Thermistor R0 = 15 kΩ ± 3%
B constant = 3480 ± 2%
R
t
=15exp{3480(
273+t
–
273
)}
1
1
Thermistor R50 = 17 kΩ ± 2%
B constant = 4150 ± 3%
R
t
=17exp{4150( 273+t
–
323)}
1
1
Thermistor R120 = 7.465 kΩ ± 2%
B constant = 4057 ± 2%
R
t
=7.465exp{4057( 273+t
–
393)}
1
1
Medium temperature thermistor
• Thermistor <Heat sink> (TH8)
20°C 250 kΩ
30°C 160 kΩ
40°C 104 kΩ
50°C 70 kΩ
60°C 48 kΩ
70°C
34 kΩ
80°C
24 kΩ
90°C 17.5 kΩ
100°C 13.0 kΩ
110°C 9.8 kΩ
High temperature thermistor
• Thermistor <Discharge> (TH4)
• Thermistor <Comp. surface> (TH33)
0
10
20
30
40
50
-20 -10 0
10 20 30 40 50
Temperature (°C)
Resistance (k
"
)
200
150
100
50
0
25
50
75
100
125
Temperature (
°C
)
Resistance (k
"
)
500
400
300
200
100
0
25
50
75
100
120
Temperature (°C)
Resistance (k
"
)
