The **OBT50-R3-E2** is a subminiature photoelectric sensor manufactured by Pepperl+Fuchs. It is a **diffuse mode sensor**, meaning it detects objects by reflecting light directly off the target surface back to the receiver. --- ### 1. Technical Specifications The following table summarizes the key electrical and functional parameters of the OBT50-R3-E2: | Parameter | Specification | | :--- | :--- | | **Sensor Type** | Diffuse Mode (Background Evaluation) | | **Detection Range** | 0 to 50 mm | | **Operating Voltage** | 10 ... 30 V DC | | **Output Type** | PNP, Normally Open (NO) | | **Switching Current** | Max. 100 mA | | **Switching Frequency** | 1000 Hz (High speed) | | **Response Time** | 0.5 ms | | **Light Type** | Modulated visible red light (640 nm) | --- ### 2. Electronic Components & Connectivity #### Wiring Configuration (E2 Output) The "E2" suffix designates the specific output logic and wiring. This model features a **3-wire** connection: * **Brown (+):** Supply voltage (10-30V DC). * **Blue (-):** Ground (0V). * **Black (Out):** PNP output signal. When an object is detected, the black wire connects to the positive supply voltage. #### Protection Circuitry The device includes integrated electronic protection to ensure longevity in industrial environments: * **Reverse Polarity Protection:** Prevents damage if the power supply wires are swapped. * **Short Circuit Protection:** Pulsing protection for the output stage. --- ### 3. Indicators and Housing Despite its miniature size (R3 series), the sensor includes visual feedback for status monitoring: 1. **Green LED:** Power indicator (Static on when powered). 2. **Yellow LED:** Switching state (Lights up when an object is detected within the 50mm range). 3. **Optical Face:** Uses a specialized lens to focus the visible red light, making alignment easy for the user. --- ### 4. Application Logic The electronic logic is designed for **light-on** operation. This means the PNP output transistor becomes active (conductive) when the receiver senses reflected light from an object. Because it is a diffuse sensor, no separate reflector is required; however, the detection distance (50mm) is sensitive to the color and texture of the target material.