## Overview of Omron E3B2-R5M4-US The **E3B2-R5M4-US** is a retroreflective photoelectric sensor manufactured by Omron. It is a heavy-duty industrial sensor designed for object detection using a beam of light that reflects off a target reflector. --- ### Technical Specifications The following table summarizes the key electronic and physical characteristics: | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retroreflective (Requires a reflector) | | **Sensing Distance** | Up to 5 meters (16.4 feet) | | **Supply Voltage** | 24 to 240 VAC or 12 to 240 VDC | | **Output Type** | Relay Output (SPDT - Single Pole Double Throw) | | **Switching Capacity** | 3A at 250 VAC (Resistive load) | | **Response Time** | 20 ms maximum | | **Light Source** | Infrared LED | | **Connection Type** | Terminal Block (Conduit entry) | | **Enclosure Rating** | IP66 (Dust-tight and water-resistant) | --- ### Key Electronic Components & Features #### 1. Universal Power Supply The internal circuitry includes a multi-voltage regulator, allowing the device to operate on a wide range of voltages (both AC and DC). This makes it highly versatile for different industrial power grids without needing additional transformers. #### 2. Relay Output (SPDT) Unlike NPN/PNP transistor outputs which are limited by low current, this sensor uses an integrated electromechanical relay. * **Advantage:** It can directly switch heavy loads (like motors, large solenoids, or light bulbs). * **Isolation:** Provides physical galvanic isolation between the sensor's internal logic and the output load. #### 3. Sensitivity Adjustment The sensor features a built-in potentiometer (variable resistor). This allows the user to fine-tune the detection threshold, which is useful for: * Detecting semi-transparent objects. * Operating in dusty or high-glare environments. #### 4. Operation Modes (Light-ON / Dark-ON) The unit typically features a switch to select the logic: * **Light-ON:** The relay activates when the beam is reflected back to the sensor. * **Dark-ON:** The relay activates when the beam is interrupted by an object. --- ### Wiring Configuration Because this model uses a terminal block, the wiring is typically categorized as follows: ```text Terminal 1 & 2: Power Input (24-240V AC/DC) Terminal 3: Relay Common (COM) Terminal 4: Normally Closed (NC) Terminal 5: Normally Open (NO) ``` ---