January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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Resistance Temperature Detectors
Resistance Temperature Detectors (RTDs) operate within a narrow range of temperatures, but have much better accuracy than thermocouples (below 600 degrees Celsius). These are usually constructed with very fine platinum wire tightly wrapped around ceramic or glass. This produces a resistance-to-temperature relationship. Because it is a resistance-based measurement, an excitation current is needed to operate an RTD (1 mA).
The resistance of an RTD follows a predefined slope. RTDs are specified with a base resistance. A 200 PT100 RTD has a slope of 0.00200 Ohms/degrees Celsius from 0 to 100 degrees Celsius. Within that range (0 to 100 degrees Celsius), the slope will be linear. RTDs come in two, three, and ...
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