## Overview of the MP1103-3-RV The **MP1103-3-RV** is a specialized electronic component, typically categorized as a **Magnetic Speed Sensor** or **Magnetic Pickup (MPU)**. These sensors are primarily used to detect the speed of rotating ferrous (iron-based) machinery, such as gears, flywheels, or rotors, by converting mechanical motion into an electrical signal. --- ### 1. Key Technical Specifications While specific manufacturers (like Murphy or similar industrial brands) may have slight variations, the standard parameters for this class of sensor are as follows: | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | Magnetic Pickup (Passive) | | **Output Signal** | AC Sine Wave (Frequency based) | | **Housing Material** | Stainless Steel | | **Thread Size** | 3/4-16 UNF | | **Total Length** | Approx. 3.0 inches (76 mm) | | **Operating Temperature** | -65°F to +225°F (-54°C to +107°C) | | **Resistance** | High Impedance (approx. 100-300 Ohms) | --- ### 2. Internal Electronic Construction The MP1103 series operates on the principle of **Electromagnetic Induction**. It does not require external power to generate a signal. 1. **Permanent Magnet:** Located inside the tip of the sensor, creating a magnetic field that extends outward. 2. **Pole Piece:** A ferrous core that concentrates the magnetic flux. 3. **Induction Coil:** A fine copper wire coil wrapped around the magnet/pole piece. 4. **Housing:** Usually a ruggedized stainless steel casing to protect the internals from vibrations and oil. --- ### 3. Functional Operation The electronics work through a simple four-step process: 1. **Magnetic Flux Change:** As a gear tooth passes the sensor tip, it disrupts the magnetic field. 2. **Induction:** The change in magnetic flux induces a small voltage pulse in the internal coil (Faraday's Law). 3. **AC Waveform:** As teeth continue to pass, the sensor produces an **AC Sine Wave**. 4. **Frequency Analysis:** The frequency of this AC signal is directly proportional to the RPM (Revolutions Per Minute) of the gear. --- ### 4. Typical Applications * **Engine Speed Governing:** Providing feedback to electronic governors. * **Tachometers:** Displaying RPM on industrial dashboards. * **Safety Shutdowns:** Detecting overspeed or underspeed conditions in generators or pumps. ---