The **E3F2-R4B4-P1** 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. --- ### 1. Key Technical Specifications The following table summarizes the electrical and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Sensing Type** | Retro-reflective (requires a reflector) | | **Sensing Distance** | 0.1 to 4 Meters (with E39-R1 reflector) | | **Input Voltage** | 10 to 30 VDC | | **Output Type** | PNP Open Collector | | **Output Mode** | Light-ON / Dark-ON (Selectable via wiring) | | **Housing Material** | Plastic (PBT) / Brass (Nickel Plated) | | **Thread Size** | M18 (18mm diameter) | | **Connection Method** | M12 Connector (4-pin) | --- ### 2. Functional Description As a **Retro-reflective** sensor, the E3F2-R4B4-P1 contains both the light emitter and the receiver in a single housing. * **Operation:** It emits a beam of light toward a dedicated reflector. The light bounces back to the receiver. * **Detection:** When an object passes between the sensor and the reflector, the light beam is interrupted, triggering the electronic output. * **Polarization:** This specific model usually features a **Polarizing Filter**, allowing it to detect shiny or mirror-like objects without false triggering. --- ### 3. Electronic Wiring and Pinout Since this model uses a **PNP** output and an **M12 Connector**, the wiring typically follows the standard industrial color code: ```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 Load) ``` #### Output Circuitry The PNP output means that when the sensor is triggered, it "switches" the positive voltage (V+) to the Black wire (Pin 4). The load should be connected between the Black wire and the Blue (Ground) wire. --- ### 4. Application Use Cases * **Conveyor Systems:** Counting boxes or detecting the presence of items on a line. * **Packaging Machinery:** Monitoring the flow of materials. * **Automated Gates:** Detecting vehicles or pedestrians for safety stops.