The **E3JM-R4S4-US** is a high-performance photoelectric sensor manufactured by Omron. It is a **Retro-reflective** sensor, meaning it emits a light beam toward a reflector and detects objects when the beam is interrupted. Below is a detailed breakdown of its electronic specifications and features. ### 1. Core Technical Specifications | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective (with MSR function) | | **Sensing Distance** | 4 meters (when using E39-R1 reflector) | | **Supply Voltage** | 12 to 240 VDC or 24 to 240 VAC (Universal) | | **Output Type** | Relay (SPDT) - Single Pole Double Throw | | **Switching Capacity** | 3A at 250 VAC / 3A at 30 VDC | | **Response Time** | 20 ms maximum | | **Light Source** | Infrared LED | | **Connection** | Terminal Block (Conduit G1/2) | --- ### 2. Key Electronic Features #### A. Universal Voltage Power Supply One of the most significant electronic characteristics of the E3JM series is its **built-in power supply**. It can accept a wide range of input voltages (AC or DC), making it highly versatile for various industrial environments without needing a separate power converter. #### B. MSR (Mirror Surface Rejection) Function The sensor includes a polarizing filter. This allows it to distinguish between the light reflected from the dedicated reflector and the light reflected from a shiny object (like a stainless steel can or a mirror). This prevents false triggers from reflective targets. #### C. Relay Output (SPDT) Unlike NPN/PNP transistor outputs found in smaller sensors, this model uses a mechanical relay. * **Benefit:** It can switch higher current loads directly. * **Durability:** The relay is rated for approximately 100,000 operations under full load. #### D. Built-in Timer Functions The "S4" designation in the model number typically indicates the inclusion of internal timing functions: * **ON-delay** * **OFF-delay** * **One-shot** * Timer durations are usually adjustable (0.1 to 5 seconds). --- ### 3. Wiring Configuration (Terminal Block) Inside the sensor head, you will find a terminal block with the following typical pin-out: | Terminal | Function | Description | | :--- | :--- | :--- | | **1 & 2** | Power Supply | Connect 12-240V DC or 24-240V AC | | **3** | Common (COM) | The common point for the relay switch | | **4** | Normally Closed (NC) | Connected to COM when no object is detected | | **5** | Normally Open (NO) | Connected to COM when an object is detected | --- ### 4. Environmental Protection * **IP Rating:** IP66 (Dust-tight and protected against powerful water jets). * **Operating Temp:** -25°C to 55°C.