The **E3S-R67** is a high-performance, transparent-object detection photoelectric sensor manufactured by Omron. It is specifically designed to detect clear glass, PET bottles, and transparent films which are often difficult for standard sensors to "see." --- ## 1. Core Technical Specifications The E3S-R67 belongs to the retro-reflective category, meaning it emits light towards a reflector and detects the interruption of the returned beam. | Feature | Specification | | :--- | :--- | | **Sensing Method** | Retro-reflective with MSR (Mirror Surface Rejection) | | **Sensing Distance** | 100 mm to 1 m (with E39-R1 reflector) | | **Supply Voltage** | 10 to 30 VDC | | **Current Consumption** | 40 mA maximum | | **Output Type** | NPN / PNP (Open Collector) | | **Operation Mode** | Light-ON / Dark-ON (Switch selectable) | | **Response Time** | 1 ms Max | --- ## 2. Key Electronic Features ### A. MSR (Mirror Surface Rejection) Function The electronic circuitry includes a polarizing filter. This allows the sensor to distinguish between the light reflected from a **reflector** (which rotates the light's polarization) and the light reflected from a **shiny object** like a PET bottle (which does not rotate it). This prevents false triggers from reflective surfaces. ### B. Sensitivity Adjustment The unit features a 2-turn trimmer potentiometer. Because transparent objects only block a small percentage of light, the electronic sensitivity must be tuned finely to detect the slight drop in light intensity. ### C. Output Protection Circuitry The E3S-R67 is equipped with several protective electronic features: * **Reverse Polarity Protection:** Prevents damage if the power leads are swapped. * **Load Short-circuit Protection:** Protects the internal transistor if the output is grounded. * **Mutual Interference Prevention:** Allows two sensors to be mounted close together without cross-talk. --- ## 3. Wiring Configuration The E3S-R67 typically uses a standard 3-wire or 4-wire DC connection. Below is the typical logic for an NPN/PNP output model: ```markdown Brown : +V (10-30 VDC) Blue : 0V (GND) Black : Control Output (Load) White : Mode Selection (Light-ON/Dark-ON) *On some models, this varies* ``` --- ## 4. Application Suitability * **PET Bottle Lines:** Detection of clear plastic bottles. * **Glass Manufacturing:** Detecting glass panes on a conveyor. * **Packaging:** Detecting transparent plastic wrap or shrink film.