The complexity of the circuit used to process RTD analog signals basically varies according to the application. Components such as amplifiers and analog-to-digital converters (ADCs), which generate their own errors, are indispensable. Power the sensor only when the measurement is necessary - you can also achieve low power operation by this method, but this will make the circuit much more complex. Moreover, the power required to electrify the sensor will also increase its internal temperature, thus affecting the accuracy of measurement. With a few milliamperes of current, this self-heating effect produces temperature errors (which can be corrected, but need further consideration). In addition, keep in mind that the cost of wire wound platinum RTD or thin film RTD may be quite high, especially when compared with the cost of IC sensors.

2019年09月30日

RTD
Main Advantages of Thermistors

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Resistance and Temperature of RTD

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