Safety Devices - Photocells

Photocells These are the most common type of device used to provide 'hold open' safety. Photocells work by releasing an infrared beam across the driveway. The infrared beam is constantly monitored by the photocell receiver unit; if the beam is interrupted (broken) the receiver unit sends a signal to the electronic control unit. Photocells are used to prevent the gates from closing but they are sometimes also used to signal the gates to open. SEA produce standard plastic long range, slim line and battery systems, also offering solid aluminum anti-vandal units if required.