The **E3F2-R2RB41-M** is a high-performance, cylindrical photoelectric sensor manufactured by **Omron**. It belongs to the E3F2 series, which is known for its durability and standardized M18 housing. ### Technical Specifications The following table outlines the primary electronic and physical characteristics of the sensor: | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective (Requires a Reflector) | | **Sensing Distance** | 0.1 to 2 Meters (Standard) | | **Output Type** | PNP Open Collector | | **Operation Mode** | Light-ON / Dark-ON (Selectable via wiring) | | **Supply Voltage** | 10 to 30 VDC | | **Current Consumption** | 30 mA maximum | | **Response Time** | 2.5 ms maximum | | **Connection Method** | M12 4-pin Connector | | **Housing Material** | Nickel-plated Brass (Metal) | | **Degree of Protection** | IP67 (Waterproof/Dustproof) | --- ### Core Electronic Components #### 1. The Light Source and Receiver This sensor utilizes an **Infrared LED** as the emitter. Because it is a "Retro-reflective" type, the emitter and receiver are both housed in the same unit. The light beam travels to a reflector and bounces back to the receiver. If an object breaks this beam, the sensor triggers. #### 2. PNP Output Circuit The "B4" in the model name indicates a **PNP output**. * When the sensor is triggered, it connects the output pin to the positive supply voltage ($V_{cc}$). * It is an **Open Collector** design, meaning it can switch external loads up to a specific current limit (usually 100mA). #### 3. M12 Connector Pinout Since this is the "-M" version, it uses a standard 4-pin circular connector. The typical wiring is as follows: ```text Pin 1: Brown -> +V (10-30 VDC) Pin 2: White -> Control Input (L-ON/D-ON selection) Pin 3: Blue -> 0V (Ground) Pin 4: Black -> Output (PNP) ``` ### Key Advantages * **Built-in Amplifier:** The electronics are fully integrated; no external controller is needed. * **Mutual Interference Protection:** Allows sensors to be mounted close to one another without false triggering. * **Short Circuit Protection:** The output circuit is protected against accidental wiring errors. ---