The **OBT50-R2-E2** is a subminiature photoelectric sensor manufactured by Pepperl+Fuchs. It is a **diffuse mode sensor**, meaning it transmits light and detects the reflection directly off the object being sensed. Below is the detailed breakdown of its electronic components and specifications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Detection Range** | 0 ... 50 mm | | **Operating Voltage** | 10 ... 30 V DC | | **Output Type** | 1 PNP output, short-circuit protected, reverse polarity protected | | **Switching Type** | NO (Normally Open) / Light-ON | | **Switching Frequency** | Approx. 800 Hz | | **Response Time** | < 0.6 ms | | **No-load Current** | < 10 mA | --- ### 2. Electronic Components & Functionality #### A. Light Source (Emitter) The device uses a **Modulated Visible Red LED** (630 nm). * **Electronic benefit:** Visible light allows for easy alignment during installation. * **Modulation:** The light is pulsed at a specific frequency to prevent interference from ambient light sources (like sunlight or overhead lamps). #### B. Output Stage (E2 - PNP) The "E2" suffix in the part number indicates the specific electronic output configuration: * **PNP Logic:** The sensor acts as a source, providing a positive voltage to the load when triggered. * **Protection:** Includes integrated protection against short circuits and reverse polarity, ensuring the internal transistors aren't destroyed by wiring errors. #### C. Signal Processing The internal circuitry consists of a high-speed comparator that evaluates the intensity of the light reflected back to the receiver. * **Fixed Sensitivity:** Unlike larger sensors with potentiometers, the R2 series often features a fixed detection range to maintain its ultra-compact form factor. --- ### 3. Wiring Diagram The sensor typically comes with a fixed cable or an M8 connector. The standard 3-wire color coding is as follows: ```markdown 1. Brown (L+) -> +10 to 30 V DC 2. Black (Out) -> PNP Output (Load) 3. Blue (L-) -> 0 V (Ground) ``` --- ### 4. Physical & Environmental Construction * **Housing:** Polycarbonate (PC) / ABS. * **Optical Face:** PMMA (Acrylic). * **Status Indicators:** A green LED typically indicates "Power On," and a yellow LED indicates "Switching State" (object detected). ---