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How to Choose a Gate Photo Eye

Through-Beam or Retro-Reflective

• Through-beam: a separate transmitter and receiver face each other across the opening. You run wire to both sides, but range is longer and the beam handles dirt and glare better.
• Retro-reflective: one unit sends the beam to a reflector and reads it back. Wiring stays on one side, which makes retrofits easier, but range is shorter and the reflector must stay clean and aimed.
• Polarized retro-reflective: filters out stray reflections from shiny cars and metal gates.

Range

Measure across the opening and choose a rated range with room to spare. Rain, fog, dust and a dirty lens all cut working range outdoors, so a beam rated right at your distance will trip more often.

Monitoring and Operator Match

A gate operator built to the 2016 UL 325 standard needs a monitored photo eye on its safety input. Check which type the board accepts: a 10K ohm style input, a brand-specific monitored eye, or a bus system like Nice BlueBUS. Older operators may still take the non-monitored models. More background is on the gate and door safeties page.

Mounting

Mount eyes on rigid posts so gate vibration does not knock them out of line. Hoods block direct sun from the receiver, a common cause of false trips. Many sites run two sets at different heights to catch both cars and smaller objects.

Security Beams

Twin and quad beam detectors and curtain sensors from Seco-Larm are for intrusion alarms and driveway alerts. They are not gate entrapment devices.

Common Questions

Why does my gate reverse with nothing in the way?

Check alignment first, then clean the lens and reflector. Sun on the receiver, spider webs and loose wiring are the next usual causes.

Can I use a garage door safety sensor on a gate?

No. Garage door sensors are short range and paired with their own openers. Use a photo eye the gate operator accepts, and add safety edges where the beam cannot cover a pinch point.