Dispositivos de seguridad para portones y puertas

How to Choose Gate Safety Devices for UL 325

What UL 325 Requires

Since August 2016, UL 325 requires automatic gate operators to use monitored external entrapment protection. The operator checks that a working device is connected. If it does not see one, the gate will not run normally. Each entrapment zone needs coverage, in the closing direction and the opening direction where a zone exists.

Photo Eyes or Safety Edges

• Photo eyes are non-contact. They send a beam across the opening and signal the operator when it is broken.
• Safety edges are contact sensors. They mount on the gate or a post and signal when pressed.

Most sites use both: eyes across the opening and edges at pinch points the beam cannot reach.

Match the Monitoring Type

Operators check devices in different ways, such as a 10K ohm resistive circuit or a brand-specific pulsed signal. LiftMaster gate operators, for example, use LiftMaster monitored photo eyes and edge kits. Look up the operator's safety input before you buy, and match the device to it.

Wired or Wireless Edges

An edge on a moving gate needs a way to reach the controller. Wireless edge kits from Miller Edge, EMX and LiftMaster put a battery transmitter on the gate and a receiver at the operator, which avoids coil cords and trenching.

Door Safeties

Commercial door operators use photo eyes and edges too. For door hardware and controls, see overhead door parts.

Common Questions

Why will my gate only move while I hold the button?

The operator likely does not see a working monitored device. Check for a missing, misaligned or failed photo eye or edge, and loose safety wiring.

Do vehicle loops meet UL 325 entrapment rules?

No. Loops detect vehicles only. A UL 325 gate still needs monitored photo eyes or edges on top of any loops.

Can I use non-monitored safeties on a new operator?

Not on their own. Operators built to the 2016 standard expect monitored devices on their safety inputs.