Why Safety Sensors Matter
A residential auto gate weighs 100–400kg and moves with enough force to seriously injure a child, pet, or anyone caught between the gate and a pillar. Modern auto gates are designed to detect obstacles and reverse — but only if the right sensors are fitted, calibrated, and tested.
Skipping or skimping on safety sensors is the single most common corner cut in budget gate installations. It's also where homeowners regret not pushing harder on the spec. The cost is small; the consequences of failure are not.
Photocells (Photo-Eye Sensors)
Photocells are infrared beam pairs mounted on either side of the gate opening at roughly knee height. The transmitter sends a beam to the receiver; if anything breaks the beam during closing, the gate stops and reverses.
Every reputable installer includes a basic pair as standard. Cost: $80–$150 per pair. Some setups use two pairs — one at knee height, one at chest height — for $150–$250 total. For homes with children or pets, the second pair is worth it.
Safety Edges (Pressure-Sensitive Strips)
A safety edge is a rubber strip mounted along the leading edge of the gate. When the strip touches anything (including a person, a car bumper, or a wall pillar), it triggers an immediate stop-and-reverse.
Photocells catch things in the beam path. Safety edges catch anything the gate physically contacts — useful for slow approaches that don't break the photocell beam, or for objects too short to interrupt it. Cost: $200–$400 per gate leaf installed. Common on commercial gates but underused on residential.
Anti-Crush / Obstacle Detection (Motor-Based)
Modern auto gate motors have built-in current sensors. When the motor draws more current than expected — because something is in the way — the control board stops and reverses the gate. This is the "third line of defence" after photocells and safety edges.
On premium brands (FAAC, BFT, CAME), this is sensitive enough to detect a person leaning against the gate. On cheaper brands the sensitivity is cruder — the gate may push for half a second before reversing, which isn't enough margin for a small child. This alone is a reason to spec a known brand.
Other Sensors Worth Knowing
Loop detectors: buried wire loops in the driveway that detect vehicles. They prevent the gate closing on a car that's stopped under it. Cost: $300–$600 installed. Common on commercial gates, occasionally added to homes with very long driveways. Flashing lamp / warning light: required by some installers as standard, signals "gate is moving" to anyone nearby. Cost: $50–$120.
Pedestrian access sensors: detect a person waiting at the side gate area and trigger a slower, smaller opening. Niche, mostly commercial.
The Minimum Spec We Push For
One pair of photocells. A reputable-brand motor with calibrated obstacle detection. A flashing warning lamp during movement. A working manual release in case of emergency. This baseline is what every quote we look at should include without you having to ask.
WhatsApp us your existing setup or a draft quote and we'll tell you whether the safety spec is adequate or if there's a corner being cut. Don't pay full price for a gate that's missing a $150 sensor pair.
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