The **M2UDS-153-R2** is a specific electronic component typically categorized as a **Magnetic Speed Sensor** (often a Magnetic Pickup or MPU). These parts are primarily used to sense the speed of a rotating engine or gear by detecting changes in magnetic flux. --- ### 1. General Specifications While specific datasheets can vary by manufacturer (often used in power generation and industrial engine governors), the "M2UDS" series generally follows these technical parameters: | Feature | Description | | :--- | :--- | | **Component Type** | Magnetic Pickup (Speed Sensor) | | **Thread Size** | 5/8" - 18 UNF (Standard for industrial sensors) | | **Connector Type** | 2-Pin MS Connector (Military Standard) | | **Output Signal** | Analog AC Sine Wave | | **Operating Temp** | -55°C to +105°C | --- ### 2. Internal Electronic Construction The M2UDS-153-R2 is a **passive** electronic device, meaning it does not require an external power supply to operate. It consists of three primary internal parts: 1. **Permanent Magnet:** Creates a static magnetic field around the tip of the sensor. 2. **Pole Piece:** An iron core that extends the magnetic field towards the target gear. 3. **Inductive Coil:** Fine copper wire wrapped around the pole piece. ### 3. Principle of Operation The electronics work based on **Faraday’s Law of Induction**: * As a ferrous (iron/steel) gear tooth passes the tip of the sensor, it disrupts the magnetic field. * This flux change induces a voltage across the internal coil. * The output is an **AC voltage** where the **frequency** is directly proportional to the speed of the gear ($RPM \times \text{Teeth Count}$). --- ### 4. Typical Applications This part is commonly found in the following systems: * **Diesel/Gas Generators:** Providing speed feedback to the Electronic Governor (EFC). * **Industrial Turbines:** Monitoring shaft rotation. * **Heavy Machinery:** Transmission speed sensing. --- ### 5. Wiring and Connectivity The "R2" designation often refers to a specific revision or connector orientation. * **Pin A / Pin B:** Usually interchangeable as the output is a floating AC signal. * **Shielding:** It is highly recommended to use twisted-pair shielded cable to prevent Electromagnetic Interference (EMI) from the alternator or ignition system.