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8-5. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <Plate HEX liquid> (TH6)
• Thermistor <Ambient> (TH7)
• Thermistor <Suction> (TH33)
Thermistor R0 = 15 kΩ ± 3%
B constant = 3480 ± 2%
1
=15exp{3480( 273+t – 273 )}
R
t
0:
15 kΩ
30:
10:
9.6 kΩ
40:
20:
6.3 kΩ
25:
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:
180 kΩ
25:
50 kΩ
50:
17 kΩ
70:
8 kΩ
90:
4 kΩ
High temperature thermistors
• Thermistor <Discharge> (TH4)
• Thermistor <Comp. surface> (TH34)
Thermistor R120 = 7.465k' ± 2%
B constant = 4057 ± 2%
1
=7.465exp{4057( 273+t – 393 )}
R
t
20: 250 kΩ
70:
30: 160 kΩ
80:
40: 104 kΩ
90:
50:
70 kΩ
100: 13.0 kΩ
60:
48 kΩ
110:
OCH562D
1
4.3 kΩ
3.0 kΩ
1
1
34 kΩ
24 kΩ
17.5 kΩ
9.8 kΩ
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
28
50
75
100
125
50
75
100
120
Temperature (:)
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