PT100 MAX31865 RTD Temperature Thermocouple Sensor Amplifier Module for Arduino Raspberry Pi are temperature sensors that contain a resistor that changes resistance value as its temperature changes, basically a kind of thermistor.
In this sensor, the resistor is actually a small strip of Platinum with a resistance of 100 ohms at 0C, thus the name PT100.
Compared to most NTC/PTC thermistors, the PT type of RTD is much most stable and precise (but also more expensive) PT100s have been used for many years to measure temperature in laboratory and industrial processes, and have developed a reputation for accuracy (better than thermocouples), repeatability and stability
However, to get that precision and accuracy out of your PT100 RTD you must use an amplifier that is designed to read the low resistance.
Better yet, We have an RTD Sensor Amplifier with the MAX31865 breakout for use with any 2, 3, or 4-wire PT100/1000 RTD
We’ve carried various MAXIM thermocouple amplifiers and they’re great – but thermocouples don’t have the best accuracy or precision, for when the readings must be as good as can be. PT100 MAX31865 RTD Temperature Thermocouple Sensor Amplifier Module for Arduino Raspberry Pi handles all of your RTD needs, and can even compensate 3 or 4-wire RTDs for better accuracy. Connect to it with any microcontroller over SPI and read out the resistance ratio from the internal ADC. We put a 430 0.1% resistor as a reference resistor on the breakout. We have some example codes that will calculate the temperature based on the resistance for you.
We even made the breakout 5V compliant, with a 3.3V regulator and level shifting, so you can use it with any Arduino or microcontroller.
Each order comes with one assembled RTD amplifier breakout board.
Also comes with two 2-pin terminal blocks (for connecting to the RTD sensor) and a pin header (to plug into any breadboard or perfboard)
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