SparkFun
PT100 Platinum RTD Temperature Sensor
· MPN: SEN-17059
This PT100 is a platinum RTD (Resistance Temperature Detector) for accurate temperature sensing. It has a nominal resistance of 100Ω at 0°C, with resistance ...
This PT100 is a platinum RTD (Resistance Temperature Detector) for accurate temperature sensing. It has a nominal resistance of 100Ω at 0°C, with resistance changing as temperature changes.
It is suitable for applications across a broad temperature range, and is commonly used where stable, repeatable temperature measurement is needed. The sensor uses a three-wire connection scheme, with the two red wires connected to one end of the resistor and the white wire connected to the other.
For use with the SparkFun Qwiic PT100 ADC, connect the red wires to terminals 3 and 4, connect the white wire to terminal 2, and short the A and B pads on the back of the Qwiic PT100 PCB. Use Example4-3-Wire from within the ADS122C04 library.
When checking the wiring with a DMM, you should see approximately 1Ω between the red wires and approximately 100Ω between a red wire and the white wire.
Specifications:
- Nominal resistance at 0°C: 100Ω
- Temperature Coefficient (0°C up to 100°C): 3.85 - 10-3 K-1
- Tolerance classes to DIN EN 60751: A, B
- Operating Temperature Range: -50°C up to 550°C
- Measurement Current (DC) at 25°C: 1mA
- Maximal Permissible Peak Current (DC) at 25°C: 3mA
- Insulation Resistance: > 10MΩ
- Self-heating at 0°C: < 0.5 K / mW
A useful sensor for temperature logging, process monitoring, lab projects, and Qwiic PT100 ADC builds.
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- ADS122C04
- A Texas Instruments analogue-to-digital converter chip that measures small analogue voltages and reports them digitally over I2C. The exact chip matters because it sets the board’s resolution, input options, speed, and software support.
- DIN
- DIN means data in, the pin where this display receives data from the controller. Connecting DIN to the correct SPI data output pin is needed for the screen to receive pixel and command information.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- RTD
- An RTD, or resistance temperature detector, is a temperature sensor that changes resistance in a predictable way as it heats or cools. It is useful in water-quality probes because accurate temperature measurement helps correct conductivity readings.
- Tolerance
- Tolerance tells you how far the real resistance value may be from the printed value. A 1% resistor is useful when a circuit needs more predictable behaviour than a looser 5% or 10% part.
Find this product in
PT100 Sensor Datasheet
Datasheet · 508.7 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 399.7 KB · Click any page to view full size
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