24MHGRVX-A2 Module Technical Guide
TROUBLESHOOTING
Other Checks
Thermistor Sensor Testing Instructions
1. Use the resistance column to check the thermistor sensor
while disconnected from the controllers (not powered).
2. Use the voltage column to check sensors while connected
to powered controllers. Read voltage with meter set on
DC volts. Place the “-” (minus) lead on GND terminal
and the “+” (plus) lead on the sensor input terminal being
investigated.
Measuring Resistance
To read the resistance, set the meter to Ohms. Unplug the sensor
connector from the board and measure the resistance across the
disconnected wires. This resistance should match the corresponding
temperature from Table 6, page 23, and Table 7, this page.
Table 7: 0-5V Temperature Sensor - Voltage and Resistance for Type III Sensors
Temp
(°F)
Temp
(°C)
Resistance
(Ohms)
Voltage @
Input (VDC)
72 22.2 11136 2.695
73 22.8 10878 2.665
74 23.3 10625 2.635
75 23.9 10398 2.607
76 24.4 10158 2.577
78 25.6 9711 2.520
80 26.7 9302 2.465
82 27.8 8893 2.407
84 28.9 8514 2.352
86 30 8153 2.297
88 31.1 7805 2.242
90 32.2 7472 2.187
95 35 6716 2.055
100 37.8 6047 1.927
105 40.6 5453 1.805
110 43.3 4923 1.687
115 46.1 4449 1.575
120 48.9 4030 1.469
125 51.7 3656 1.369
130 54.4 3317 1.274
135 57.2 3015 1.185
140 60 2743 1.101
145 62.7 2502 1.024
150 65.6 2288 0.952
Temp
(°F)
Temp
(°C)
Resistance
(Ohms)
Voltage @
Input (VDC)
-10 -23.3 93333 4.620
-5 -20.6 80531 4.550
0 -17.8 69822 4.474
5 -15 60552 4.390
10 -12.2 52500 4.297
15 -9.4 45902 4.200
20 -6.6 40147 4.095
25 -3.9 35165 3.982
30 -1.1 30805 3.862
35 1.7 27140 3.737
40 4.4 23874 3.605
45 7.2 21094 3.470
50 10 18655 3.330
52 11.1 17799 3.275
54 12.2 16956 3.217
56 13.3 16164 3.160
58 14.4 15385 3.100
60 15.6 14681 3.042
62 16.7 14014 2.985
64 17.8 13382 2.927
66 18.9 12758 2.867
68 20 12191 2.810
69 20.6 11906 2.780
70 21.1 11652 2.752
71 21.7 11379 2.722
TEMPERATURE TO RESISTANCE/VOLTAGE CHART
Note: If the voltage is above 5.08 VDC the sensor or wiring is “open.” If the voltage is less than 0.05 VDC, the sensor or wiring is shorted.
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