PT100 PT1000 MAX31865 RTD Temperature Thermocouple Sensor Amplifier Module

PT100 PT1000 MAX31865 RTD Temperature Thermocouple Sensor  Amplifier Module

For precision temperature sensing, nothing beats a Platinum RTD. Resistance temperature detectors (RTDs) 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 0°C, 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) PT100's 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.

Quick Spec

• Simple Conversion of Platinum RTD Resistance to Digital Value

• Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)

• Compatible with 2-, 3-, and 4-Wire Sensor Connections

• SPI-Compatible Interface

• 20-Pin TQFN and SSOP Packages

• 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125NC (Varies Due to RTD Nonlinearity)

• Total Accuracy Over All Operating Conditions: 0.5NC (0.05% of Full Scale) max

• Fully Differential VREF Inputs

• 21ms (max) Conversion Time

• ±45V Input Protection

• Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element)

Resources

• MAX31865 Datasheet

• Pinout

• Arduino Code

• Library on GitHub

• Lookup Table