Orion System RNE Modular Controller - Manual (Page 72)

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RNE CONTROLLER TROUBLESHOOTING
RNE Modular Controller Field Technical Guide 72
Thermistor Sensor Testing Instructions
Use the resistance column to check the thermistor sensor while
disconnected from the controllers (not powered).
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.
If the voltage is above 5.08 VDC, then the sensor or wiring is “open.” If
the voltage is less than 0.05 VDC, then the sensor or wiring is shorted.
Temperature Sensor Testing
Temperature Sensor Testing
The following sensor voltage and resistance tables are provided to aid in
checking sensors that appear to be operating incorrectly. Many system
operating problems can be traced to incorrect sensor wiring. Be sure all
sensors are wired per the wiring diagrams in this manual.
If the sensors still do not appear to be operating or reading correctly,
check voltage and/or resistance to confi rm that the sensor is operating
correctly per the tables. Please follow the notes and instructions below
each chart when checking sensors.
Temperature – Resistance –
Voltage for Type III 10 K Ohm
Thermistor Sensors
Temp
(ºF)
Resistance
(Ohms)
Voltage @
Input (VDC)
-10 93333 4.620
-5 80531 4.550
0 69822 4.474
5 60552 4.390
10 52500 4.297
15 45902 4.200
20 40147 4.095
25 35165 3.982
30 30805 3.862
35 27140 3.737
40 23874 3.605
45 21094 3.470
50 18655 3.330
52 17799 3.275
54 16956 3.217
56 16164 3.160
58 15385 3.100
60 14681 3.042
62 14014 2.985
64 13382 2.927
66 12758 2.867
68 12191 2.810
69 11906 2.780
70 11652 2.752
71 11379 2.722
72 11136 2.695
73 10878 2.665
Table 4: Temperature/Resistance for Type III 10K
Ohm Thermistor Sensors
Temperature – Resistance –
Voltage for Type III 10 K Ohm
Thermistor Sensors
Temp
(ºF)
Resistance
(Ohms)
Voltage @
Input (VDC)
74 10625 2.635
75 10398 2.607
76 10158 2.577
78 9711 2.520
80 9302 2.465
82 8893 2.407
84 8514 2.352
86 8153 2.297
88 7805 2.242
90 7472 2.187
95 6716 2.055
100 6047 1.927
105 5453 1.805
110 4923 1.687
115 4449 1.575
120 4030 1.469
125 3656 1.369
130 3317 1.274
135 3015 1.185
140 2743 1.101
145 2502 1.024
150 2288 0.952
Table 4, cont.: Temperature/Resistance for Type III
10K Ohm Thermistor Sensors