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Full machine-readable index: https://core-electronics.com.au/llms.txt # Adafruit PT100 RTD Temperature Sensor Amplifier - MAX31865 **Type:** Product page · **SKU:** ADA3328 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-pt100-rtd-temperature-sensor-amplifier-max31865.html ([markdown](https://core-electronics.com.au/adafruit-pt100-rtd-temperature-sensor-amplifier-max31865.html.md)) For precision temperature sensing, nothing beats a Platinum RTD. Resistance temperature detectors (RTDs) are temperature sensors that contain a resistor that changes... ## Pricing - **Price:** $26.80 (inc GST) — $24.36 AUD, exc GST - **Quantity discounts:** 10+ $23.64 (exc GST) · 50+ $23.15 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 17 today, and up to 500 more in 7–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA3328:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA3328:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description 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. 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, have an amplifier that can automatically adjust and compensate for the resistance of the connecting wires. If you're looking for a great RTD sensor, today is your lucky day because Adafruit have a lovely **Adafruit RTD Sensor Amplifier with the MAX31865** breakout **for use with any 2, 3 or 4 wire PT100 RTD!** Adafruit have 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. The MAX31865 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. Adafruit put a 430O 0.1% resistor as a reference resistor on the breakout. Adafruit have some example code that will calculate the temperature based on the resistance for you. Adafruit 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 pin header (to plug into any breadboard or perfboard). **A required PT100 RTD is not included!** (But Adafruit stock them in the shop). Some soldering is required to solder the headers and terminal blocks to the breakout, but it's an easy task with soldering tools. **Please note: this does not include an RTD sensor!** ## Technical Details [Datasheets, PCB CAD files, diagrams, Fritzing object and more in the tutorial](https://learn.adafruit.com/adafruit-max31865-rtd-pt100-amplifier/) Product Dimensions: 28.0mm x 25.5mm x 3.0mm / 1.1" x 1.0" x 0.1" Product Weight: 2.7g / 0.1oz ![](https://core-electronics.com.au/attachments/localcontent/rohs_icon_8216055e11.jpg) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/3/3/3328-06.jpg)