The circuit uses the popular Pt100 RTD, which has a resistance of 100 Ω at 0°C. Its temperature coefficient of 0.00385 Ω/Ω/ºC produces a 38.5-Ω increase in resistance from 0°C to 100°C. Thus, the ...

This circuit applies heating power for about 90% of the time and measures the RTD thermoelectric potential during the approximately 10% of off-time (Fig. 1). Two switches are required.

ADI’s AD74412R and AD74413R quad-channel software-configurable I/O devices offer flexible building control and process automation. Each device provides the functionality for analog output, analog ...