The variable range feature makes the Series 28 sensors effective on a variety of applications. The ability to define the sensing range is particularly useful on rotary tower systems, which feature a carriage that rotates around the package. When the sensing range is adjusted to the width of the conveyor, the sensor, circled at left, ignores everything beyond the conveyor belt.
The variable range feature makes the Series 28 sensors effective on a variety of applications. The ability to define the sensing range is particularly useful on rotary tower systems, which feature a carriage that rotates around the package. When the sensing range is adjusted to the width of the conveyor, the sensor, circled at left, ignores everything beyond the conveyor belt.

The variable range feature makes the Series 28 sensors effective on a variety of applications. The ability to define the sensing range is particularly useful on rotary tower systems, which feature a carriage that rotates around the package. When the sensing range is adjusted to the width of the conveyor, the sensor, circled at left, ignores everything beyond the conveyor belt.


A packaging application needed a sensor able to not only detect all shades of black without error but also to work over an extended sensing range of at least 4 ft. Thus proximity sensors had to reliably detect flat black and glossy black materials. But a common problem with photoelectric sensors is that dark colors absorb more light than they reflect, which potentially shortens the sensing range.

A Pepperl+Fuchs' Series 28 photoelectric sensor with background suppression and an infrared light source handled the application. The background-suppression sensor is a diffused mode photoelectric that uses separate sensing elements to detect objects close together without detecting the background material. Its sensing range for black is just 5% less than its range for white targets, and it can operate at a variable distance. Developers installed the sensor on the yellow carriage of the top-loading machine. In operation it senses the contours of the package to let the machine automatically wrap any size package. Highly visible LEDs give operators a visual status indication from as far away as 50 ft.

 Edited by Leland Teschler

 

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