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Retro-Reflex Sensor as Trigger Sensor for Measuring Cheese Blocks

In the food industry, it is important to accurately measure blocks of cheese on conveyors before cutting. To avoid keeping the measuring sensors permanently in operation, a retro-reflex sensor is installed upstream with laser light as a trigger. Only when this sensor detects an object are the subsequent sensors activated for measurement – which reduces unnecessary power consumption. The fine laser beam and high switching frequency ensure precise detection of the leading edge. Thanks to the single-lens optics without blind spots, the objects are reliably detected over the entire line width.

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Retro-Reflex Sensors

Retro-reflex sensors for roller conveyors work according to the through-beam mode. Light is sent to a reflector mounted opposite the sensor that is then reflected back. If the light beam is interrupted by the object on the conveyor, the sensor is switched. The use of red light enables even shiny and black objects to be detected.

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