The **M2PA-1F-R2/CE** is a high-performance **Magnetic Proximity Sensor** (or magnetic reed switch unit) commonly used in industrial automation, specifically for detecting the position of pneumatic cylinders or moving mechanical parts. --- ### ## Technical Specifications The "R2" typically refers to the lead wire length (2 meters), and "CE" indicates compliance with European safety standards. | Component / Feature | Specification | | :--- | :--- | | **Switching Type** | Reed Switch (SPST-NO) | | **Voltage Range** | 5V to 120V AC/DC | | **Max Switching Current** | 100mA (max) | | **Contact Capacity** | 10W (max) | | **Internal Voltage Drop** | 2.5V or less | | **Indicator Lamp** | Red LED (Lights up when activated) | | **Operating Temperature** | -10°C to +70°C | | **Protection Class** | IP67 (Dust-tight and water-resistant) | | **Cable Length** | 2 Meters (PVC Jacket) | --- ### ### Internal Electronic Components The device is comprised of several key electronic layers: 1. **Reed Switch:** The heart of the sensor. It consists of two ferromagnetic blades sealed in a glass tube. When a magnet (usually on a cylinder piston) approaches, the blades close the circuit. 2. **Current Limiting Resistor:** Protects the internal LED from burning out when the operating voltage is applied. 3. **LED Indicator:** A small surface-mount LED that provides visual feedback to the technician that the magnetic field has been detected and the switch is closed. 4. **Varistor/Zener Diode:** Often included in "CE" rated models to protect the internal contacts from voltage spikes (EMC protection). --- ### ### Wiring Diagram The M2PA-1F-R2/CE is a **2-wire** device. It is wired in series with the load. ```mermaid [Power Source (+)] ---- [Load (PLC Input/Relay)] ---- (Brown Wire) [Sensor] (Blue Wire) ---- [Power Source (-)] ``` > **Note:** Because this is a 2-wire switch, there is a small "leakage current" even when the switch is off, and a "voltage drop" when the switch is on. Ensure your PLC input threshold is compatible with a 2.5V drop. --- ### ### Key Applications * **Pneumatic Cylinders:** Mounted in the "T-slot" or "C-slot" of an actuator to sense end-of-stroke. * **Safety Interlocks:** Detecting if a protective door with a magnet is closed. * **Counting:** Counting rotations or movements of a magnetic cam.