GMAX brand active infrared (IR) beam motion sensor (photocell) with an integrated relay, model GM-S409. This vital safety device is widely utilized in access control systems, automated gates, and parking barriers. When the invisible infrared beam passing between the transmitter and receiver is interrupted by a person or vehicle, the sensor instantly triggers the relay, effectively preventing the gate or barrier arm from closing and avoiding potential damage or injury. It features a maximum reliable detection range of up to 15 meters.
