Photoelectric Line Sensor features multimodal operation.

Press Release Summary:

Operating in 3 basic modes, BOL 27K provides means for product width sensing, edge detection, hole location, and web loop tension measurement. Retroreflective photoelectric sensor projects measuring line of light onto strip of reflective tape, which it uses to measure and locate key attributes of object with 0.15 mm resolution. With discrete and analog outputs, measuring line sensor suits error proofing, sheet feed control, web control, and packaging tasks.

Original Press Release:

Balluff Photoelectric Line Sensor Provides Inexpensive Edge and Width Measurement

Florence, KY (April 2007): Balluff's unique BOL 27K advanced measuring line sensor provides the most cost effective way to sense product width, edge detection, hole location, and web loop tension. With both discrete and analog outputs, this specialized retroreflective photoelectric sensor projects a measuring line of light on to a strip of special reflective tape which it uses to measure and locate key attributes of an object. (More information can be found at

The BOL 27K operates in three basic modes. Edge position mode detects the position of an object passing over the tape - perfect for strip feed positioning of objects made of materials as different as paper to steel. Once the edges of the reflective tape are calibrated, the percentage of the tape covered by an object gives the BOL 27K an accurate location of the object's edge without the need of feeler gauges or mechanical contact with the object. This mode can also provide the distance from a hole to one of the edges of the object.

Center positioning mode detects the center of an object independent of the object's width. Once the length of the reflective tape is calibrated, the percent of tape blocked by the object gives the BOL 27K the width of the object. This provides a lower cost width measurement than can be had with a vision system.

Width detection mode provides the distance between the two edges of an object, such as a pipe or a group of objects such as stacks of blister packs. For objects that are more than 150 mm wide, two BOL 27Ks can be used in concert to provide the measurement.

The 0.15 mm resolution precision of the sensor makes it ideal for error proofing, sheet feed control, web control, and a range of packaging tasks.

Balluff Inc., the U.S. subsidiary of Balluff GmbH, Neuhausen, Germany, is a leading manufacturer of a wide range of inductive, optical, capacitive and magnetic sensors as well as linear position transducers and ID systems. Balluff products for OEM and factory floor solutions are used to control, regulate, automate, assemble, position, and monitor manufacturing, assembly, and packaging sequences for industries including metalworking, automotive, plastics, material handling, wood processing, aerospace, electrical, and electronics.

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