## E3JM-R4S4T-US: Technical Overview The **E3JM-R4S4T-US** is a high-performance, rectangular photoelectric sensor manufactured by **Omron**. It belongs to the E3JM series, which is known for its built-in power supply and versatile output options. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective with MSR (Mirror Surface Rejection) | | **Sensing Distance** | 4 meters (when using E39-R1 reflector) | | **Power Supply Voltage** | 12 to 240 VDC or 24 to 240 VAC (Multi-voltage) | | **Output Type** | Relay Output (SPDT) | | **Timer Function** | Built-in (On-delay, Off-delay, One-shot) | | **Connection Method** | Terminal Block (Conduit size: 1/2-14NPT) | | **Light Source** | Red LED (Visible) | --- ### 2. Breakdown of the Model Code To understand the electronic components and functionality, the model name can be deconstructed: * **E3JM:** The series name (Square-sized with built-in power supply). * **R4:** Indicates **Retro-reflective** sensing with a range of **4 meters**. * **S4:** Refers to the **MSR function**, allowing the sensor to detect shiny/metallic objects without being fooled by reflections. * **T:** Indicates the presence of a **Timer function** (adjustable via internal potentiometers). * **US:** UL/CSA certified version for the North American market. --- ### 3. Electronic Features and Controls #### A. Internal Timer Controls This specific model features a set of DIP switches and potentiometers located under the protective cover: * **Mode Selector:** Switch between Light-ON and Dark-ON operation. * **Timer Adjuster:** A dial to set the delay time (typically ranges from 0.1 to 5 seconds). * **Functions:** Includes ON-delay, OFF-delay, and One-shot options to stabilize signals for PLC inputs. #### B. Relay Output The sensor uses an internal electromechanical relay. * **Switching Capacity:** Usually rated for 3A at 250 VAC. * **Advantage:** Allows for direct switching of larger AC or DC loads without needing an external interface relay. #### C. Terminal Wiring The device uses a terminal block for wiring, making it robust for industrial environments. 1. **Terminals 1 & 2:** Power Supply (Universal AC/DC). 2. **Terminals 3, 4, 5:** Relay contacts (Common, Normally Open, Normally Closed). --- ### 4. Application Use-Case Because of the **MSR (Mirror Surface Rejection)** feature, this sensor is ideal for: * Conveyor systems moving shrink-wrapped products. * Detecting shiny automotive parts. * General-purpose gate or door automation where multi-voltage power is available. ---