Photoelectric Switch

Photoelectric Switch 
Reliable Sensing for Automated Precision

A Photoelectric Switch is a powerful sensor used to detect objects, changes in surface conditions, or distances through light emission and reflection. Commonly applied in industrial automation, packaging lines, robotics, and conveyor systems, this switch enables contactless object detection with extreme accuracy and speed.

Using a beam of infrared or visible light, a photoelectric switch senses the presence or absence of objects without the need for physical contact. This makes it ideal for clean, fast, and efficient detection in harsh or sensitive environments.

Whether you're automating machinery or optimizing workflow, delivers high-performance reliability across countless industrial and commercial applications.

Product Specifications

Sensor Type: Through-beam, Retro-reflective, or Diffuse-reflective

Detection Range: Up to 10 meters (model-dependent)

Light Source: Infrared or Visible Red LED

Response Time: <1 ms

Power Supply: 10–30 VDC (standard)

Output Type: NPN/PNP, Normally Open/Closed

Housing Material: ABS or Metal (model-dependent)

Protection Level: IP65 or higher (dust and water-resistant)

Mounting Type: Bracket or surface-mounted

What is a Photoelectric Switch?

Detects the presence or absence of an object using a light transmitter (LED) and a receiver. It emits a beam of light and senses interruptions or reflections to determine if an object is present.

There are three main types of photoelectric switches:

Through-beam – The emitter and receiver are separate; detection occurs when the beam is interrupted.

Retro-reflective – Uses a reflector; detects when the light beam is interrupted between sensor and reflector.

Diffuse-reflective – Both emitter and receiver are in one housing; detects reflected light from the object itself.

This sensor enables non-contact detection, reducing wear and tear while increasing response speed and reliability.

Key Features of the

Non-Contact Object Detection

Detects without physical contact, making it ideal for fragile, hot, or fast-moving items.

High-Speed Response

Fast reaction time (<1 millisecond) for use in high-speed automation and safety applications.

Multiple Detection Modes

Choose between through-beam, retro-reflective, or diffuse-reflective models to suit your exact needs.

Adjustable Sensing Distance

Allows flexible mounting and customization based on environmental or object size variations.

LED Status Indicators

Built-in LED lights show real-time sensor status, simplifying troubleshooting and setup.

Dust and Moisture Resistance

Most models offer IP65+ protection, perfect for industrial use in challenging environments.

Benefits of Using

Improved Automation Efficiency

Significantly boosts automation efficiency by providing highly precise and rapid object detection on manufacturing lines. Its fast response time ensures that products are detected instantly, reducing errors caused by missed or false detections. This precision helps to streamline operations, minimize downtime, and maximize overall throughput, allowing production lines to run smoother and faster. By automating repetitive detection tasks with accuracy, businesses can improve productivity and meet tighter deadlines with consistent quality output.

Long Service Life

Thanks to its non-contact sensing technology, the photoelectric switch experiences no mechanical wear and tear. Unlike mechanical sensors that rely on physical contact and moving parts, this optical sensor operates using light beams, which eliminates friction and physical degradation. As a result, the switch is highly durable and ideal for continuous, long-term operation in demanding industrial environments. This reliability reduces maintenance costs and downtime while extending the sensor’s lifespan, providing excellent return on investment for automated systems.

Energy Efficient

The photoelectric switch operates at low voltage levels, typically between 10 and 30 volts DC, and consumes minimal power during operation. Its efficient design ensures that it uses only the necessary energy to emit and detect light signals without excess power waste. This energy efficiency not only lowers electricity costs but also enhances overall system safety by reducing heat generation and electrical load. In large-scale automation setups with multiple sensors, this power-saving feature contributes to more sustainable and cost-effective manufacturing processes.

Compact and Lightweight

Designed to fit into tight spaces and compact industrial equipment, the photoelectric switch features a small, lightweight form factor. This makes it easy to install in locations where space is limited, such as inside robotic arms, conveyor frames, or portable machines. The compact size also allows for flexible mounting options, including surface mount or bracket mount configurations, without adding bulk or weight. Lightweight sensors are particularly advantageous in mobile or handheld systems where minimizing weight improves maneuverability and reduces operator fatigue.

Versatile Application

The photoelectric switch is highly versatile and can detect a wide range of objects regardless of their shape, size, or surface characteristics. It works effectively with transparent materials like glass or plastic, reflective surfaces such as metals, matte finishes, and even irregularly shaped or textured objects. This adaptability makes it suitable for diverse industrial sectors including packaging, automotive, electronics, pharmaceuticals, and food processing. By accurately sensing different materials and surfaces, the switch supports complex automation tasks, quality control, and precise positioning in various manufacturing environments.

How to Use

Choose a Detection Mode – Select through-beam for long distances, retro-reflective for reflective targets, or diffuse-reflective for space-saving setups.

Install Sensor – Mount using provided bracket. Align properly for optimal light beam targeting.

Wire to System – Connect to your control unit or PLC using NPN or PNP output wiring.

Power On and Adjust – Power up the switch and fine-tune sensitivity if needed.

Test and Operate – Check LED status, place target object in range, and confirm detection response.

Applications

Conveyor belt item detection

Bottle and packaging counting

Robotic arm positioning

Label detection in print lines

Safety interruption on gates and doors

Smart agriculture and irrigation automation

Contactless door opening systems

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