Temperature measurement circuit composed of the platinum RTD

Published:2011/8/23 22:29:00 Author: | Keyword: Temperature measurement, platinum RTD | From:SeekIC

The temperature measurement circuit which is composed of the platinum RTD is as shown in the figure 3-14. In this circuit, the RT is used as the temperature sensor, it is designed as one kind of 100Ω(25℃) platinum RTD. This kind of platinum RTD has high stability and very high precision temperature coefficient, so the +5V power supply supplies the 1mA current to the RT through R1, and we can get the relationship between the temperature and output signal voltage, if the temperature changes 1℃, the circuit will produce -385μV signal voltage. The proportion type measuring bridge circuit is composed of the R2, RP1 and R3, A1 is the bridge circuit amplifier which can be used as the digital control potentiometer of the feedback component to capture and keep the initial reference temperature T0 automatically.



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