The **OBT50-R2-E0-P** is an ultra-miniature diffuse mode photoelectric sensor manufactured by Pepperl+Fuchs. It is designed for short-range object detection in space-constrained industrial environments. --- ### Technical Specifications The following table outlines the primary electronic and operational characteristics: | Feature | Specification | | :--- | :--- | | **Detection Range** | 0 ... 50 mm | | **Operating Voltage** | 10 ... 30 V DC | | **Output Type** | 1 NPN output, short-circuit protected, reverse polarity protected, open collector | | **Switching Type** | Light-on (The output is active when light is reflected back) | | **No-load Supply Current** | < 10 mA | | **Switching Frequency** | Approx. 800 Hz | | **Response Time** | < 600 µs | | **Light Source** | LED (Red), 640 nm | --- ### Key Electronic Components & Wiring #### 1. Internal Circuitry * **Emitter:** Uses a modulated Red LED light source. Modulation helps the sensor distinguish its own light from ambient light (optical noise). * **Receiver:** A photodiode matched to the 640 nm wavelength. * **Control Interface:** The "E0" designation indicates an NPN output configuration. This means the sensor "sinks" the load to the negative rail (0V) when an object is detected. #### 2. Connection Diagram (Standard 3-Wire) The device typically features a fixed cable or a pigtail connector. The wiring logic is as follows: | Wire Color | Assignment | Function | | :--- | :--- | :--- | | **Brown (BN)** | +V | Positive supply (10-30V DC) | | **Black (BK)** | Output | Switching signal (NPN) | | **Blue (BU)** | 0V | Common / Ground | --- ### Electronic Features * **Reverse Polarity Protection:** Prevents damage if the power supply leads are accidentally swapped. * **Short-Circuit Protection:** Protects the internal switching transistor (NPN) from over-current if the load or wiring shorts to ground. * **Diffuse Mode Logic:** The sensor contains both the emitter and receiver in one housing. It relies on the target object to reflect light back to the receiver. Because the range is small (50mm), it is highly effective for detecting small parts on conveyors or inside machinery. ---