The **E3F2-R4B4F** is a high-performance photoelectric sensor manufactured by **Omron**. It belongs to the E3F2 series, characterized by its cylindrical M18 threaded housing and built-in amplifier. --- ## 1. Technical Specifications The E3F2-R4B4F is specifically a **Retro-reflective** sensor. This means it emits light and requires a reflector to bounce the beam back to the receiver located in the same head. | Feature | Specification | |:---|:---| | **Sensing Type** | Retro-reflective (with MSR function) | | **Sensing Distance** | 0.1 to 4 Meters (with E39-R1 reflector) | | **Housing Diameter** | M18 (Cylindrical) | | **Output Type** | PNP (Open Collector) | | **Operation Mode** | Light-ON / Dark-ON (Selectable via wiring) | | **Supply Voltage** | 10 to 30 VDC | | **Current Consumption** | 30 mA max | | **Response Time** | 2.5 ms max | | **Connection Method** | Pre-wired (2-meter cable) | --- ## 2. Key Electronic Components & Features ### A. The MSR (Mirror Surface Rejection) Function The "R" in the model name indicates it possesses **MSR**. This is an internal optical filter system that ensures the sensor only detects light reflected from the specific reflector. * **Purpose:** It prevents false triggers from shiny or metallic objects (like a soda can) that might otherwise act as a mirror. ### B. Output Circuitry (PNP) This sensor uses a **PNP transistor** output. * When the sensor is triggered, it connects the output load to the **Positive** rail (+V). * It is commonly used in European industrial standards and is compatible with most PLC inputs. ### C. Wiring Configuration The device typically uses a 4-wire configuration to allow for mode selection: | Wire Color | Function | Description | |:---|:---|:---| | **Brown** | +V | Power Supply (10-30 VDC) | | **Blue** | 0V | Ground / Common | | **Black** | Output | PNP Control Signal | | **White** | Mode Select | Connect to +V for L-ON, or 0V/Open for D-ON | --- ## 3. Physical Construction * **Housing Material:** Usually ABS (Plastic) or Brass-Nickel plated, depending on the specific sub-variant (the 'F' suffix often denotes plastic). * **IP Rating:** Typically **IP67**, making it resistant to water and dust in industrial environments. * **Indicators:** Features a Red LED (Operation indicator) and sometimes a Green LED (Stability indicator) to help with alignment. ---