Retro-Reflective Photoelectric Sensor | 2M Range with Reflector | NPN/PNP

This retro-reflective photoelectric sensor finds objects up to 2 meters away. It sends a light beam to a reflector. When something blocks the beam, the sensor's output changes. This makes it a dependable object sensor for many uses. Features and Benefits - 2-meter sensing range - This distance is enough to monitor wide openings like garage doors or conveyor paths. - Comes with a prismatic reflector - The sensor and reflector are a complete set, ready for you to use. - Flexible NPN/PNP and AC/DC models - It comes in DC 10-30V with NPN/PNP outputs or an AC 90-250V version for different power systems. - Polarized optics - It helps prevent false signals from shiny surfaces. This makes it good for finding glossy boxes or shrink-wrapped pallets. Applications - Automatic gate openers - Use it as a safety beam to stop a gate from closing if something is in the way. - Packaging lines - Count boxes, bottles, or packages as they pass a certain spot on a conveyor. - Access control - Watch doorways or entry points to trigger alarms or count people. How They Work A photoelectric sensor, sometimes called an optical sensor or light sensor, operates by detecting changes in light. This particular retro-reflective model projects a light beam towards a reflector. The reflector bounces the light back to the sensor. When an object breaks this light beam, the sensor detects the interruption and triggers its output. This mechanism allows for reliable object detection over a specified distance, in this case, up to 2 metres. The sensor can be wired for either NPN or PNP output, depending on the control system requirements. 3 Main Types of Photoelectric Sensors There are three primary types of photoelectric sensors, each suited for different detection scenarios. - Through-beam sensors: These have separate transmitter and receiver units. An object is detected when it breaks the beam between them. - Diffuse-reflective sensors: These sensors have both the transmitter and receiver in one unit. They detect objects by sensing light reflected directly off the object's surface. - Retro-reflective sensors: Like this product, these sensors have a single unit containing the transmitter and receiver, and rely on a separate reflector to return the light beam. Common Applications Photoelectric sensors are versatile and find use in various industrial and commercial settings. Their ability to detect objects without physical contact makes them ideal for automation tasks. Common applications include counting items on a conveyor belt, detecting the presence of products in packaging machinery, and monitoring access points. They can also be used for position sensing, ensuring components are correctly placed before the next stage of a manufacturing process, or for simple door and gate automation where a beam needs to be broken. The Core Components Every photoelectric sensor, including this retro-reflective model, consists of several key components. The light emitter, typically an LED, generates the light beam. The light receiver, often a phototransistor or photodiode, detects the returned or interrupted light. An optical lens focuses the light beam from the emitter and directs the reflected light to the receiver. Finally, the output circuit processes the signal from the receiver and switches the NPN or PNP output, indicating object detection. This product also includes the necessary reflector. The 3 Main Operating Modes Photoelectric sensors generally operate in one of three main modes, which define how they react to the presence or absence of an object. - Light-on mode: The output activates when the receiver detects light. In a retro-reflective sensor, this means the output is active when the light beam is unbroken. - Dark-on mode: The output activates when the receiver does not detect light. For a retro-reflective sensor, the output would activate when an object breaks the beam. - Dual mode: Some sensors can be configured to operate in either light-on or dark-on mode, offering greater flexibility for different applications.