Monitored entrapment protection devices are required to protect all entrapment zones in automated gate applications. Photo‐cells are used as type B1 (non‐contact sensors) devices. Electric edges are used as type B2 (contact sensors) devices.
Type B1 non-contact devices (such as photo-beams) and/or Type B2 contact sensors (such as reversing edges) are required for most automatic gate system applications. DKS gate operators require a minimum of one (1) device to be connected in each direction of travel - otherwise the operator will not run. All entrapment devices used with DKS gate operators are monitored per the requirements of the UL 325 Standard for Safety.