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PT100 Sensor

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A PT100 is a Platinum RTD (Resistance Temperature Detector) with a resistance of 100Ω at 0°C which changes with temperature. It is suitable for applications in the temperature range of -200°C to 600°C but are more commonly used in the range -50°C to +250°C.

To use this sensor with our Qwiic PT100 ADC please connect the red wires to terminals 3 & 4. Connect the white wire to terminal 2. Short the A and B pads on the back of the Qwiic PT100 PCB. Be sure to use Example4-3-Wire from within the ADS122C04 library.

How do PT100 sensors work? On four-wire sensors the red wires are connected to one end of the resistor; the white wires are connected to the other end. For three-wire, they use the same scheme: the two reds to one end; and one white to the other. Using a DMM you should see ~1 Ohm between the red wires; and ~100 Ohms between red and white.

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  • So this worked great with the PT100 (ADS122CO2), SPX-16770 ... except ... this is a 3-wire sensor and you say to short A-B and put the red wires to port 3 and 4 and the silver wire to port 2. However when I did that it seemed the sensor was shorted out and it read -240C. I removed the short between A-B, and now it works and reads the correct temperature.

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