Controlled Products Systems Group 222X383 - Manual (Page 40)

Installation and Maintenance Manual
32
D0119, Rev. F
Placement and Use of Secondary Pedestrian Entrapment Sensors
WARNING:
To reduce the risk of serious injury or death, read and follow all instructions in the gate
operator handbook and on the warning labels.
Automatic gate operators are intended only for vehicular use and pedestrians must be routed to a separate
pedestrian gate, however sensors are still required in order to provide a degree of protection should anyone
happen to stray into the area of an automatic gate. Generally there are two types of external sensors that may
be used: Contact type sensors, such as an edge sensor, and non-contact sensors, such as photoelectric eyes.
Current industry standards require the use of either type, or both, of these sensors as a secondary device. In
Class I and Class II automatic sliding gate installations because the general public is likely to be present.
Although there are alternatives for Class III and IV installations, we highly recommend the use of external
sensors for all automatic gate applications.
The specifier or installer may choose either photoelectric eyes or edge sensors, or use these devices in
combination, but both the open and closing directions of gate travel must be guarded. The UL 325 standard for
automatic sliding gates specifically requires the following:
• One or more non-contact sensors (photoelectric eyes) shall be located where the risk of entrapment or
obstruction exists, such as the perimeter reachable by a moving gate.
• One or more contact sensors (edge sensors) shall be located at the leading edge, trailing edge and post
mounted both inside and outside of a sliding gate.
• A hardwired contact sensor shall be located and it’s wiring arranged so that the communication between
the sensor and the gate is not subjected to mechanical damage.
• A contact sensor that transmits its signal to the gate operator shall be located such that the signal is not
impeded by building structures or other obstructions and shall function under its intended end-use
conditions.
• The contact and non-contact sensors must be tested and labeled as “Recognized Components” under
the UL 325 standard in order to be deemed acceptable for use in this application.
Study the entrapment protection schematic and consider your specific installation to determine where
the greatest risks of entrapment exist. Locate edge sensors and/or the photoelectric sensors
accordingly. Be certain that a sufficient number of sensors are used so that both directions of gate
travel are properly guarded.