Photoelectric switches, also known as photoelectric sensors or photocells, detect objects or obstructions using light—typically infrared beams. When the light beam is interrupted by an object or person, the sensor triggers an output signal to halt or reverse elevator doors, enhancing safety. Elevator WorldOwjlift
Common Configurations in Elevators:
| Type | Description |
|---|---|
| Point Photocell | A single-beam sensor positioned at a specific height to detect small obstructions like fingers during door closing. thangmaynidec.vn |
| Bar Photocell (Light Curtain) | Multiple beams arranged vertically along the door frame create a protective curtain; more comprehensive coverage across the door’s height. Elevator Worldthangmaynidec.vn |
| Retroreflective or Fork-Type | Sensors with U-shaped or forked designs, where a beam must be broken within the slot to detect an object. Useful in door edges or cabin boundaries |
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