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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 R0 = 15 k" ± 3%
B constant = 3480 ± 2%
1
=15exp{3480( 273+t – 273 )}
R
t
0:
15 k"
30:
10:
9.6 k"
40:
20:
6.3 k"
25:
5.2 k"
Medium temperature thermistor
• Thermistor <Heat Sink> (TH8)
Thermistor R50 = 17 k" ± 2%
B constant = 4150 ± 3%
1
=17exp{4150( 273+t – 323 )}
R
t
0: 180 k"
25:
50 k"
50:
17 k"
70:
8 k"
90:
4 k"
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 k"
70:
30: 160 k"
80:
40: 104 k"
90: 17.5 k"
50:
70 k"
100: 13.0 k"
60:
48 k"
110: 9.8 k"
OCH605A
1
4.3 k"
3.0 k"
1
1
34 k"
24 k"
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
25
Temperature (:)
25
50
75
100
125
Temperature (:)
50
75
100
25
Temperature (:)
120
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