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Photoelectric sensors, or photo eyes, are advanced devices designed to detect the presence, absence, or distance of objects using a beam of electromagnetic radiation. These sensors are critical in various automated processes across industries such as manufacturing, packaging, and logistics.

### **Working Principle of Photoelectric Sensors**

The fundamental operation of photoelectric sensors is based on light emission and detection. An emitter within the sensor sends out a beam of light, while a receiver gauges any changes in the light pattern caused by objects intercepting the beam. This detection mechanism allows the sensor to perform its function in three primary modes: through-beam, retro-reflective, and diffuse. 

## **Types of Photoelectric Sensors**

The choice of sensor type is driven by factors such as the required sensing distance, environmental conditions, and the physical and optical properties of the target objects. The following are the three types of photoelectric sensors: 

### **Through-beam Sensors**

Through-beam sensors consist of two separate units: a transmitter and a receiver. The transmitter emits a continuous beam of light, which is received by the receiver until an object interrupts this beam. This interruption triggers the receiver to send an electrical signal, signalling the presence of the object. These sensors are highly effective for long-distance sensing and are capable of detecting objects regardless of their colour or the angle of entry. 

[Through-beam sensors](https://au.rs-online.com/web/c/automation-control-gear/sensors/photoelectric-sensors/?applied-dimensions=4294644143,4292375497,4292375501,4292375496,4292375502) are commonly used in industrial automation for assembly line parts counting and in safety devices to ensure that no part of machinery operates while personnel are in dangerous proximity.

### **Retro-reflective Sensors**

Retro-reflective photoelectric sensors ([retroreflective](https://au.rs-online.com/web/c/automation-control-gear/sensors/photoelectric-sensors/?applied-dimensions=4293741797,4293775963,4294644284)) have both the transmitter and receiver contained within the same housing but require a reflector opposite to the sensor. The reflector bounces the light beam back to the transmitter until an object breaks the beam. Polarising filters are used to distinguish between genuine interruptions by objects and false signals from other reflective surfaces. This makes them ideal for packaging lines where various reflective products and materials are processed.

### **Diffuse Sensors**

Diffuse sensors integrate the transmitter and receiver within the same housing. They detect objects based on the light reflected directly from the target back into the sensor. This setup simplifies installation as only one device needs to be mounted. [Diffuse photoelectric sensors](https://au.rs-online.com/web/c/automation-control-gear/sensors/photoelectric-sensors/?applied-dimensions=4294644291) are suitable for applications where the object's distance from the sensor is short and consistent. 

A common use is in consumer electronics manufacturing, where they ensure components are present and correctly placed before assembly. Background suppression versions of these sensors are particularly effective for applications requiring precise distance detection, such as robotic arms used in assembly processes that need to verify the position of various components.

## **Applications of Photoelectric Sensors**

Photoelectric sensors are widely used in various industries, some of which include:

### **Food and Beverage Industry**

In the food and beverage sector, photoelectric sensors are crucial for maintaining the efficiency of manufacturing and packaging lines. For instance, in bottling plants, these sensors ensure that bottle caps are correctly aligned and oriented. This precision helps prevent errors in capping, allowing for uninterrupted production processes and safeguarding the consistency and safety of packaged products.

### **Pharmaceutical Industry**

In pharmaceutical manufacturing, photoelectric sensors are essential for ensuring the accuracy of packaging processes. They detect any discrepancies, such as empty medicine packaging, preventing errors that could lead to significant health risks and financial losses.

### **Packaging Plants**

In logistics and storage, photoelectric sensors facilitate the automation of warehousing operations. They track the movement of goods, assist in the automated storing and stacking of items, and help maintain accurate inventories. This application is particularly crucial in environments with high volumes of goods, such as distribution centres.

### **Automotive Industry**

Photoelectric sensors play a vital role in automotive manufacturing, where they are used to manage the precise movement of vehicle components along assembly lines. They ensure that each part stops accurately at designated stations for welding or assembly, thereby preventing errors and maintaining high-quality standards. Their ability to deliver reliable results, even in environments with reflective surfaces such as those found in automotive plants, is particularly valued.

### **Doors & Gates**

Photoelectric sensors are also integral to the functioning of automatic doors and gates used in public transportation, elevators, and private garages. These sensors, often paired with infrared scanners, detect people or vehicles approaching, enabling doors and gates to open and close at precisely the right moments, thus enhancing both convenience and safety.

## **How to Order Photoelectric Sensors From RS?**

[RS](https://au.rs-online.com/web/) offers a diverse selection of high-quality photoelectric sensors from leading brands such as [RS PRO](https://au.rs-online.com/web/c/automation-control-gear/sensors/photoelectric-sensors/?applied-dimensions=4291780588), [BALLUFF](https://au.rs-online.com/web/c/automation-control-gear/sensors/photoelectric-sensors/?applied-dimensions=4294967102), [Sick](https://au.rs-online.com/web/b/sick/), and [Telemecanique Sensors](https://au.rs-online.com/web/c/automation-control-gear/sensors/photoelectric-sensors/?applied-dimensions=4292218344). Business account customers benefit from free delivery on all orders over $40 (excluding GST), while a delivery fee of $10 is charged for orders under this amount. For private accounts and guest customers, delivery is free for orders over $80 (excluding GST), with a $12.95 fee applicable to smaller orders.

## **Delivery Information for Australia**

To ensure prompt delivery, place your orders by 5 pm AEST from Monday to Friday. Next working day delivery is available for items stocked locally, although some regional areas may experience longer delivery times.

For a complete overview of all our delivery services, including options like same-day delivery and consolidated shipments, please visit our [delivery information](https://au.rs-online.com/web/content/support/all-articles/delivery) page. Our efficient ordering process is designed to help you quickly and easily find and receive the perfect photoelectric sensors for your needs.



Explore our range of Photoelectric Sensors to detect objects and surface changes. Including through beam, retro reflective, diffuse sensors and more. 

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