For accurate temperature sensing, a Platinum RTD is unbeatable. Resistance temperature detectors (RTDs) are temperature sensors with a resistor that changes resistance as the temperature varies, similar to a thermistor. In this sensor, the resistor is a small Platinum strip with a 100-ohm resistance at 0°C, hence the name PT100. Compared to most NTC/PTC thermistors, PT RTDs are far more stable and precise (though more costly). PT100 sensors have been trusted for years in laboratory and industrial temperature measurements, known for their accuracy, repeatability, and stability. This high-temperature PT100 sensor comes with a stainless-steel shield that can handle up to 550°C. Key features of the PT100 include: it operates on resistance measurement principles; the resistor is made of Platinum with 100 ohms at 0°C; Platinum has a positive resistance temperature factor, so resistance rises with temperature; the nominal resistance variation is 0.385Ω/°C; it offers high accuracy and stability compared to thermocouples, silicon-based temperature sensors, or thermistors. Each sensor has three wires. Two connect to either side of the platinum resistor as expected, and the third wire connects to one end of the PT100. If your RTD amplifier supports 3-wire sensors, it will drive the resistor with the first two wires and measure voltage differences to subtract wire voltage drops. If your amplifier only supports 2-wire sensors, just leave the third wire disconnected. Use our Adafruit RTD sensor breakout to connect this great sensor to your preferred microcontroller.
Using this Platinum PT100 RTD sensor is easy. First, connect it to your RTD amplifier. If your amplifier supports 3-wire sensors, use all three wires as described. If it only supports 2-wire sensors, leave the third wire alone. Then, use our Adafruit RTD sensor breakout to connect it to your favorite microcontroller. When using, keep in mind that this sensor is great for high temperatures up to 550°C because of its stainless-steel shield. But don't expose it to temperatures higher than that. For maintenance, keep it clean and dry. Avoid any physical damage to the sensor and its wires. If you notice any issues with temperature readings, check the connections first. And remember, this sensor is more stable and precise than many others, so handle it with care to keep it working well.
