Comparing Traditional Through-Beams and Fork Sensors

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Photoelectric sensors are a staple within many industries due to their ability to detect objects without contact and over longer ranges than most other sensor types. They come in various housing types and protection classes, making them adaptable to specific application needs. However, the wide range of options can make choosing the right sensor for your application difficult. This post highlights the benefits of through-beam sensors and explains why fork sensors specifically, are often the ideal choice for particular tasks.
The efficiency of through-beam sensors
Through-beam sensors are highly versatile and can detect objects regardless of color, texture, or reflectivity. This makes them highly efficient in any application requiring reliable detection of materials on parts during a process. These sensors consist of two components: an emitter and a receiver. The emitter sends a light beam toward the receiver, and when this beam is interrupted, the sensor triggers. A common example is the safety system on a garage door, which detects obstructions to prevent the door from closing. Alternatively, the sensor can be configured to trigger when the light beam is not obstructed.
Traditional through-beams vs. fork sensors
Through-beam photoelectric sensors are simple, non-contact, and reliable. They can operate over distances up to 100 meters, making them a go-to for many applications. However, they require precise alignment because the emitter and receiver are housed separately. This alignment process can be time-consuming and leave the sensors vulnerable to potential misalignment over time.
Fork sensors, also called C slot or U slot sensors, combine the emitter and receiver into a single unit. This design delivers the advantages of a through-beam sensor while eliminating installation challenges. It significantly reduces both the installation and maintenance time of the sensor in several ways:
· Only one sensor needs to be mounted instead of two
· Fewer cables are needed for networking
· No touchy alignment is needed during installation
· Future re-alignment maintenance is unnecessary
Photoelectric fork sensors can sense window widths up to over 200 mm or more, making them suitable for various applications. They also come with multiple lighting options to meet specific requirements.
Exploring lighting options in fork sensors
Choosing the right lighting technology is crucial for the performance of fork sensors:
Laser: Provides high precision and long-distance detection, which is ideal for applications with the highest accuracy.
Red Light: Its visibility simplifies alignment and maintenance, making it especially useful in complex machinery setups.
Infrared: Invisible to the human eye, infrared enhances safety and reduces interference from ambient light, making it perfect for use in contaminated environments.
Fork sensors offer advantages over traditional through-beam sensors, including ease of installation, greater reliability, and lower maintenance requirements. While they are an excellent choice, it’s essential to understand the specific application requirements. Evaluate the benefits carefully to ensure the sensor you choose best fits your needs.
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