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Slot Sensors also called as Fork Switches because of their forked shape, detect objects that pass between the two arms one is the Transmitter & the other is the Receiver. These sensors operate on a through beam design, they combine the transmitter & receiver into a fixed housing so alignment is never an issue. The transmitter emits pulsed light in the infrared wavelength range. The receiver detects the light beam and immediately converts a beam interruption caused by an object in the sensing zone into a switched signal. Fork Width is defined as the height between the transmitter & receiver. Depth is defined as the distance between the transmitter & receiver area and back of the opening.

The primary benefits of using fork sensors are easy installation, high immunity to ambient light & ability to detect different kinds of material. Sensors with different fork widths are available. They are typically used in labeling applications to detect the presence of the label compared to the carrier material. By adjusting the sensitivity with the help of a potentiometer or teach-in button, even slight differences in the light attenuation are detected. There are many applications beyond the packaging industry for fork sensors that include conveyors, small parts detection and general manufacturing.
Specs Sheet Attached

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