### Technical Overview: MP1123-3-RX The **MP1123-3-RX** is a specialized electronic component, typically categorized as a **Magnetic Speed Sensor** or **Variable Reluctance (VR) Sensor**. These parts are frequently used in automotive and industrial applications to measure the rotational speed of gears or shafts. --- ### 1. Key Technical Specifications Below are the estimated technical parameters for this class of sensor: | Feature | Specification | | :--- | :--- | | **Type** | Variable Reluctance (Magnetic Pick-up) | | **Housing Material** | Stainless Steel or High-Grade Thermoplastic | | **Thread Size** | Commonly 3/4-16 UNF (Standard for the -3 series) | | **Output Type** | Analog Sine Wave | | **Connection Type** | Radial Connector or Pigtail (RX denotes specific configuration) | | **Operating Temp** | -55°C to +105°C | --- ### 2. Electronic Components & Internal Construction The "electronic" side of this device is relatively passive but relies on electromagnetic induction principles. #### Internal Components: * **Permanent Magnet:** A small, powerful magnet located at the core of the sensor. * **Pole Piece:** A ferrous metal rod that focuses the magnetic field towards the tip. * **Inductive Coil:** Thousands of turns of fine copper wire wrapped around the pole piece. * **Encapsulation:** Epoxy resin used to protect the internal wiring from vibration and moisture. #### How it Functions: 1. **Magnetic Field:** The internal magnet creates a stationary magnetic field around the sensor tip. 2. **Disturbance:** As a ferrous gear tooth (target) passes the tip, it changes the shape of the magnetic field. 3. **Induction:** The moving magnetic field lines cut across the inductive coil. 4. **Output:** This induces an **AC Voltage (Sine Wave)**. The frequency of the wave corresponds exactly to the speed of the gear. --- ### 3. Connection and Wiring Because the MP1123-3-RX is a passive sensor, it does not require external power to operate; it generates its own voltage. ```text Pin/Wire A (+) ----> Signal Output (High) Pin/Wire B (-) ----> Signal Return (Low/Ground) ``` > **Note:** The "RX" suffix often indicates a **Radial** exit (the wires come out at a 90-degree angle to the body) or a specific **Connector** type required for heavy-duty machinery. --- ### 4. Common Applications * **Engine RPM Monitoring:** Detecting flywheel teeth. * **Transmission Output:** Measuring driveshaft speed. * **Flow Meters:** Detecting the rotation of internal turbines in fluid lines. * **Industrial Automation:** Counting pulses for conveyor belt speeds.