Which type of machine guard is designed to stop the operation of machinery if a person gets too close?

A presence-sensing device is designed specifically to enhance safety by detecting the presence of an individual near a machine and automatically stopping or disabling the machine's operation if someone gets too close. These devices use sensors, such as light curtains, laser scanners, or pressure mats, to monitor the area around the machine. If the sensor detects an intrusion into a defined safety zone, it will trigger a stop signal to ensure that the machine does not operate while someone is in a potentially hazardous area.

In comparison, fixed guards provide a permanent barrier that protects against hazards but do not respond to proximity; they remain in place regardless of whether an operator is nearby. Interlocked guards are designed to shut down machinery when the guard is removed or opened, but they do not typically offer real-time monitoring of proximity. Adjustable guards can be repositioned for different operations or machine setups, but they also do not inherently stop machinery based on the nearness of a person. Thus, the presence-sensing device stands out as the crucial technology specifically aimed at preventing accidents by recognizing human presence and acting accordingly.