Designing an analog circuit can be a frustrating experience, as noted by Nick Cornford in his Design Idea (DI), “ DIY RTD for a DMM.” With a fortnight’s struggle, I completed the design of 4 mA to ...

This guarantees optimal heat transfer between the probe and thermowell and insulates the sensor against vibration. The PR-21SL RTD can be used in two-, three- or four-wire applications and fits ...

It also cuts the number of RTD array connections (feedthroughs) from 4N to 4 + N. For 28 sensors, the resulting savings are 2N − 2 − N = 26 inputs and 4N − 4 − N = 80 feedthroughs.

The sensors feature 100, 120, 500, and 1000Ω resistance values. Available temperature coefficients include 6180 ppm, suiting DIN 43760; 6370 ppm suiting, the HVAC curve; and 6720 ppm, suiting ANSI ...