PT100 Temperature Sensor - 3-Wire RTD, 2m Braided Cable M6 Screw Probe

Specifications

• Sensor Type: PT100 RTD.

• Mounting: M6 Threaded Bolt.

• Temperature Range: -50°C to +300°C.

• Cable Length: 2 Meters.

• Cable Protection: Stainless Steel Internal Braiding.

• Strain Relief: Steel Spring at cable exit.

• Wire Configuration: 3-Wire (2x Red, 1x Blue/White).

• Termination: Spade Fork Connectors (Easy screw-terminal connection).

Key Applications & Projects

• Heavy Duty 3D Printing: Reliable hot-end monitoring for high-temp filaments (Nylon/PC) up to 300°C.

• Industrial Machinery: Screw directly into motor housings or gearbox casings to monitor overheating.

• Fluid Tanks: Ideal for coffee machines, brewing rigs, or chemical baths requiring a sealed thread mount.

• Oven Control: PID control feedback for curing ovens or reflow stations.

Project Evolution

• The Bottleneck: Plastic-coated thermistors melt above 250°C and break if the cable is pulled.

• The Upgrade: This Armoured PT100 handles up to 300°C with ease. The M6 screw ensures a solid thermal bridge, giving you faster response times and tighter control loops for your PID system.

• Effort Level: Intermediate. Requires an M6 tapped hole and a compatible RTD amplifier (MAX31865) or PLC input.

Virtual Technician & Wiring Guide

• 3-Wire Wiring: Connect the two wires of the same colour (usually Red) to the "Bias" and "Ref" terminals (or common ground) on your amplifier. Connect the single, distinct wire (Blue/White) to the Signal input.

• Tightening: The M6 bolt is hollow to house the sensor. Do not over-torque. Hand-tight plus a quarter turn with a wrench is sufficient to secure it without shearing the head.

• Cable Routing: Although braided, avoid tight kinks. Let the spring strain relief do its work by allowing a gentle curve at the sensor exit.

Accessories & Compatibility

• Included: 1x PT100 M6 Sensor with 2m Braided Cable.

• Required: M6 Tapped Hole (or Nut), MAX31865 Amplifier (for Arduino/Pi).

Helpful Tutorials & Resources

• Using PT100 Sensors with Arduino and MAX31865

Frequently Asked Questions (Technical SEO)

• Is this compatible with the Prusa/Marlin 3D printers? Yes, but not directly into the thermistor port. You must use an external amplifier board (like the E3D PT100 board or MAX31865) and update your firmware sensor type.
• What is the thread pitch of the M6 screw? It is the standard coarse pitch M6x1.0mm.
• Why are there 3 wires? The 3rd wire is for resistance compensation. It allows the controller to cancel out the resistance of the 2m cable for higher accuracy.
• Can I use it as a 2-wire sensor? Yes, leave one of the common (same colour) wires disconnected. However, accuracy will be slightly lower due to cable resistance.
• Is the cable waterproof? The stainless steel braid is not waterproof (liquid can pass through). The sensor tip is sealed, but the cable itself should not be submerged in conductive liquids.
• Does it require thermal paste? Adding thermal paste to the M6 threads before installation will significantly improve thermal transfer and response speed.
• What is the maximum temperature? The sensor element is rated for 300°C continuous use.
• Can I cut the spade connectors off? Yes, if your amplifier uses screw terminals or a JST connector, you can cut the spades and strip the wires.
• Is the braiding electrically conductive? Yes, it is stainless steel. Be careful not to short it against live electronics boards. Grounding the braid can help reduce noise.
• How do I know which wires are which? Use a multimeter. The two wires with near-zero resistance between them are the "Common" legs. The pair with ~110 ohms (at room temp) are the sensor legs.