Based on the part number **M8RS1-366-R**, this component is a **High-Performance Magneto-Resistive (MR) Speed Sensor**, commonly manufactured by brands like **ZF (formerly Cherry)** or specialized automotive sensor companies. These sensors are designed to detect the rotation speed of a target wheel (like a gear or encoder wheel) using the magnetoresistive effect. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Technology** | Anisotropic Magneto-Resistive (AMR) | | **Operating Voltage** | 4.5V to 24V DC | | **Output Type** | Digital Square Wave (Open Collector) | | **Operating Temperature** | -40°C to +150°C | | **Sensing Distance** | Up to 3.0mm (depending on target) | | **Body Material** | Stainless Steel (threaded M8x1) | | **Connection** | Integrated Cable or Connector (R denotes RoHS compliant) | --- ### 2. Functional Characteristics The "M8" in the prefix refers to the **M8x1 metric thread** housing, which is standard for industrial and automotive mounting. * **Zero-Speed Detection:** Unlike variable reluctance (VR) sensors, MR sensors can detect motion down to 0 Hz (true zero speed). * **Air Gap Performance:** AMR technology allows for a larger air gap between the sensor face and the target wheel compared to standard Hall-effect sensors. * **Insensitivity to Vibration:** The solid-state design ensures that mechanical vibrations do not create "ghost" signals. * **Immunity to Magnetic Fields:** Highly resistant to stray electromagnetic interference (EMI). --- ### 3. Pinout and Wiring (Typical) Most sensors in this series utilize a 3-wire configuration: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Red** | Vcc | Supply Voltage (Power) | | **Black** | Ground | Common Reference | | **White/Green** | Signal Out | Pulse output (NPN Open Collector) | > **Note:** Because it is an open collector output, a **Pull-up Resistor** is usually required between the Signal Out and Vcc to see a voltage swing. --- ### 4. Common Applications * **Automotive:** ABS braking systems, transmission speed monitoring, and crankshaft/camshaft positioning. * **Industrial:** Motor speed control, conveyor belt synchronization, and flow meter pulse counting. * **Off-Road:** Traction control for agricultural or construction machinery. ---