What device is typically used to detect obstacles on escalators?

The device commonly used to detect obstacles on escalators is safety sensors. These sensors are critical components that ensure the safe operation of escalators by monitoring the area near the escalator steps. When an object or a person is detected in a potentially hazardous area, the safety sensors trigger the escalator to stop, preventing accidents and injuries.

Safety sensors can include a variety of technologies, such as infrared beams or pressure-sensitive mats, that are specifically designed to recognize obstructions. Their primary purpose is to enhance user safety by ensuring that the escalator stops in the presence of an obstacle, thus minimizing the risk of entrapment or collision.

In contrast, while camera systems and infrared beams can also play roles in surveillance and additional safety measures, they are not the primary devices used for obstacle detection on escalators. Weight sensors are generally used to monitor load limits rather than directly identify obstructions.