The **GL10-R3711** is a high-performance photoelectric sensor belonging to the G10 product family by **SICK**. It is specifically designed for industrial automation tasks, such as object detection on conveyor belts. --- ## 1. Core Technical Specifications The electronic components of the GL10-R3711 are engineered for high reliability and ease of integration into AC/DC power systems. | Feature | Specification | | :--- | :--- | | **Sensor Principle** | Photoelectric retro-reflective sensor | | **Detection Principle** | Dual lens | | **Supply Voltage ($U_B$)** | 24 V AC/DC ... 240 V AC/DC | | **Power Consumption** | ≤ 2.5 VA | | **Switching Output** | Relay, SPDT (Single Pole Double Throw) | | **Switching Mode** | Light/dark switching (via selector) | | **Switching Current** | 0.11 A ... 3 A | | **Response Time** | ≤ 10 ms | | **Connection Type** | Cable, 5-wire, 2 meters | --- ## 2. Key Electronic Components ### A. The Optical System (Emitter/Receiver) The device uses **PinPoint LED technology**. Unlike standard LEDs, PinPoint LEDs create a precise, small, and intense light spot. * **Light Source:** Visible red light. * **Polarizing Filter:** The sensor contains internal polarizing filters that allow it to detect shiny or reflective objects (like stainless steel or foil) without being "fooled" by the object's own reflection. ### B. The Relay Output Unlike NPN or PNP transistor-based sensors, the **R3711** uses a mechanical relay. * **Galvanic Isolation:** The relay provides physical separation between the sensor's internal electronics and the load it is switching. * **High Voltage Switching:** It can directly trigger large contactors or AC motors without needing an intermediate amplifier. ### C. Protection Circuitry To ensure longevity in harsh industrial environments, the internal PCB includes: * **Reverse Polarity Protection:** Prevents damage if the power supply wires are swapped. * **Interference Suppression:** Filters out electromagnetic noise from nearby motors or frequency inverters. --- ## 3. Wiring Diagram Overview The cable contains 5 wires. The standard color coding for SICK relay sensors is as follows: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Brown** | L1 / + | Line voltage / Positive | | **Blue** | N / - | Neutral / Negative | | **White** | Common | Relay common contact | | **Black** | NO | Normally Open contact | | **Gray** | NC | Normally Closed contact | --- ## 4. Performance Limits * **Sensing Range:** Max. 0.08 m to 15 m (depending on the reflector used). * **Housing Material:** Plastic (ABS/PMMA), providing an **IP67** rating for water and dust resistance. * **Ambient Temperature:** Operates between -30 °C and +60 °C.