Section 6 – SR-2 Service Procedure A49A
Temperature Sensors
The sensors used for the CargoWatch data logger are RTD thermistor type sensors that differ from the sensors
used for unit control. These sensors are different than the unit temperature sensors. The Service Part number
for optional CargoWatch sensors is 41-5436. CargoWatch sensors can be identified by:
•
No shrink tubing over sensor barrel
•
Shorter sensor barrel than unit sensors
•
No sensor grades
Thermistor CargoWatch Sensor
The thermistor sensors change resistance as the temperature changes. Resistance values are as shown in the
table. They can be measured directly using a high quality ohmmeter. Note that this applies only to CargoWatch
sensors.
CargoWatch Sensor Resistance vs Temperature
°F °C
Ohms
-20°F -29°C
166,356
-10°F -23°C
115,757
0°F -18°C
86,501
10°F -12°C
61,737
20°F -7°C
47,070
30°F -1°C
34,374
32°F 0°C
32,650
40°F 4°C
26,688
50°F 10°C
19,904
60°F 16°C
15,002
70°F 21°C
11,944
80°F 27°C 9,166
90°F 32°C 7,402
100°F 38°C 5,775
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P41RA49A 31 January 2005
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