Mitsubishi Electric PUZ-SWM60VAA Service Manual page 41

<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <2-phase pipe> (TH6)
• Thermistor <Ambient> (TH7)
• Thermistor <Suction> (TH32)
Thermistor R0 = 15 kΩ ± 3 %
B constant = 3480 ± 1 %
1 1
=15exp{3480( 273+t – 273 )}
R
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 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 thermistors
• 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
50 °C 70 kΩ 100 °C
60 °C 48 kΩ 110 °C
OCH809A
4.3 kΩ
3.0 kΩ
1
34 kΩ
24 kΩ
17.5 kΩ
13.0 kΩ
9.8 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
41
Temperature (°C)
25 50 75 100 125
Temperature (°C)
50 75 100
25
Temperature (°C)
120