The **SICK GL10-R3812** is a high-performance photoelectric retro-reflective sensor designed for industrial automation. It belongs to the G10 product family, known for its long sensing ranges and high immunity to ambient light. ### 1. Key Technical Specifications The following table highlights the primary electronic and optical characteristics of the GL10-R3812: | Feature | Specification | | :--- | :--- | | **Sensor Principle** | Photoelectric retro-reflective sensor | | **Sensing Range (max)** | 0.08 m ... 15 m (with PL80A reflector) | | **Supply Voltage ($U_B$)** | 24 V AC/DC ... 240 V AC/DC | | **Output Type** | Relay (SPDT - Single Pole Double Throw) | | **Switching Mode** | Light switching (Dark switching available via wiring) | | **Switching Current (max)** | 0.11 A @ 250 V AC / 0.11 A @ 30 V DC | | **Response Time** | $\leq$ 10 ms | | **Connection Type** | Cable, 5-wire, 2 meters | --- ### 2. Internal Electronic Components & Functionality #### A. The Light Source (Emitter) The device uses a **PinPoint LED**. Unlike standard LEDs, PinPoint technology creates a small, highly visible, and precise light spot. This makes alignment easier and allows the sensor to detect smaller objects at greater distances. * **Light type:** Visible red light. * **Wave length:** 625 nm. #### B. The Receiver & Logic The sensor contains a photodiode that monitors the reflected light. * **Polarizing Filter:** The GL10-R3812 includes internal polarizing filters. This is a critical electronic feature that ensures the sensor only "sees" the light reflected by a corner-cube reflector, preventing false triggers from shiny objects (like stainless steel or foil). * **Signal Processing:** The internal ASIC (Application-Specific Integrated Circuit) filters out interference from high-frequency lighting (HF lamps) and neighboring sensors. #### C. Relay Output (Power Stage) Unlike NPN/PNP transistors found in low-voltage DC sensors, the **R3812** variant utilizes a **Relay Output**. * **Galvanic Isolation:** The relay provides physical separation between the sensor's internal logic and the load it is switching. * **Universal Voltage:** Because it uses a relay, it can operate on a wide range of voltages (Multi-voltage), making it ideal for facilities that use both AC and DC power systems. --- ### 3. Wiring Diagram Overview The cable contains 5 wires. The standard color coding for SICK relay sensors is: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Brown (BN)** | L1 / + | Supply Voltage (AC or DC) | | **Blue (BU)** | N / - | Supply Voltage (AC or DC) | | **White (WH)** | Relay Common | Shared contact for the relay | | **Black (BK)** | Relay NO | Normally Open contact | | **Gray (GY)** | Relay NC | Normally Closed contact | --- ### 4. Mechanical & Environmental Protection * **Enclosure Rating:** IP67 (Dust tight and protected against water immersion). * **Housing Material:** PVC/PMMA (Plastic), designed for rugged industrial use. * **Operating Temperature:** –30 °C ... +60 °C.