The **E3S-R16** is a high-performance, self-contained photoelectric sensor manufactured by Omron. It is specifically designed for the stable detection of transparent objects, such as glass bottles, PET bottles, and transparent films. --- ## 1. Core Technical Specifications The E3S-R16 operates on the **Retro-reflective** principle and incorporates specialized optics to handle light refraction from clear targets. | Parameter | Specification | | :--- | :--- | | **Sensing Distance** | 100 mm to 1 m (with E39-R1 reflector) | | **Light Source** | Red LED (660 nm) | | **Supply Voltage** | 10 to 30 VDC | | **Current Consumption** | 30 mA max. | | **Control Output** | NPN / PNP (Open collector) | | **Response Time** | 1 ms max. | | **Operation Mode** | Light-ON / Dark-ON (Switchable) | | **Housing Material** | Zinc Die-cast (Metal) | | **Connection Method** | Pre-wired (Standard 2m cable) | --- ## 2. Key Electronic Components & Internal Design ### A. Specialized Optical System Unlike standard photoelectric sensors, the E3S-R16 uses a **polarizing filter**. * **Function:** It emits light in a specific polarization plane. When light hits a mirror-like surface (like a glass bottle), the polarization remains unchanged, but the sensor ignores it. * **Detection:** Only when the light is interrupted or redirected by the transparent object does the sensor trigger. ### B. Sensitivity Adjustment The unit features a **Multi-turn Potentiometer**. Because detecting transparent objects requires fine-tuning to distinguish between "clear air" and "clear glass," this component allows for precise threshold setting. ### C. Output Circuitry The sensor typically employs a transistor-based output: * **NPN/PNP Selectable:** Depending on the specific sub-model or wiring, it provides a sinking or sourcing current to a PLC or relay. * **Protection:** Includes built-in load short-circuit protection and power supply reverse polarity protection. --- ## 3. Wiring Diagram (Typical) The E3S-R16 follows standard industrial wire coloring: ```text Brown : +V (10 to 30 VDC) Blue : 0V (Ground) Black : Output (Control) Pink : Mode Selection (Light-ON / Dark-ON) ``` --- ## 4. Application Strengths 1. **Transparent Object Detection:** Optimized for PET, glass, and transparent films that usually confuse standard sensors. 2. **Environmental Resistance:** The metal housing (Zinc die-cast) provides high mechanical strength and EMI (Electromagnetic Interference) shielding. 3. **High Speed:** The 1ms response time allows for detection on high-speed bottling or packaging lines.