Safety is a very important part of any automation system. Safety devices include: Photocells, vehicle induction loops and safety edges. Photocells are the most common type of device used to provide 'hold open' safety.

Photocells

Photocells work by emitting an infared beam across the driveway. The infared 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. Normally, photocells are used to prevent the gates from closing but they are sometimes used to signal the gates to open.

Safety Edges

Safety edges are another safety feature used. They are approx. 2 metres long with integral trigger wire and switch. These are items more commonly used to provide safety on sliding gate systems.