Platinum RTD Sensor - PT100 - 3 Wire 1 meter long

PT100 platinum RTD probe on a 1 m three-wire cable, 100 Ω at 0°C. Requires a dedicated amplifier (e.g. MAX31865) to convert resistance to temperature; not directly readable by a standard ADC.

Logical pinout · physical placement not verified

RTD lead A
One side of the PT100 platinum resistor element. Adafruit states two wires connect to either side of the platinum resistor.
Type · Unknown
RTD lead B
Opposite side of the PT100 platinum resistor element. The sensor is a 100 ohm platinum RTD at 0°C.
Type · Unknown
RTD sense lead
Third wire connected to one end of the PT100 element for 3-wire RTD measurement so an amplifier can subtract lead voltage drop. Leave disconnected for 2-wire amplifiers.
Type · Unknown

Pin	Type	Function
RTD lead A	Unknown	One side of the PT100 platinum resistor element. Adafruit states two wires connect to either side of the platinum resistor.
RTD lead B	Unknown	Opposite side of the PT100 platinum resistor element. The sensor is a 100 ohm platinum RTD at 0°C.
RTD sense lead	Unknown	Third wire connected to one end of the PT100 element for 3-wire RTD measurement so an amplifier can subtract lead voltage drop. Leave disconnected for 2-wire amplifiers.

Logical pinout · physical placement not verified

Pin details

3 connections

RTD lead A
One side of the PT100 platinum resistor element. Adafruit states two wires connect to either side of the platinum resistor.
Unknown
RTD lead B
Opposite side of the PT100 platinum resistor element. The sensor is a 100 ohm platinum RTD at 0°C.
Unknown
RTD sense lead
Third wire connected to one end of the PT100 element for 3-wire RTD measurement so an amplifier can subtract lead voltage drop. Leave disconnected for 2-wire amplifiers.
Unknown

Start wiring

I2C · SPI · Single data line · 3.3 – 5 V · Breakout

Verify supply voltage and logic levels before powering up.

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