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Modern gates are designed for convenience and safety, and that's where automatic gates come in. These systems make daily access easier and more secure, thanks to built-in photocells—also known as safety sensors. Here’s what you need to know about installing these sensors and why they matter.
Why are safety sensors important for automatic gates?
Safety sensors, or photocells, are essential security components found on every automatic gate. These compact, oval or rectangular devices are typically mounted on either side of the gate.
Their main function is to automatically stop the gate if something—like a person, vehicle, or pet—crosses its path. Despite their critical role, gate sensors are affordable and widely available. You can usually find a set for around thirty euros.
How do gate safety sensors work?
Gate sensors usually consist of a transmitter and a receiver. Each unit includes a power indicator, wiring terminals, and lenses. The system works by sending an infrared beam from the transmitter to the receiver. If the beam is interrupted, the gate automatically stops moving. For detailed activation or deactivation instructions, refer to the manufacturer’s installation manual.
How to install safety sensors on your gate
Sensors are typically mounted on the gate posts and on the outside edge of the gate. For reliable operation, install them at the same height and directly facing each other. While there’s no specific US standard for sensor installation, European standard EN 13241-1 requires sensors if your gate opens onto a public road.
If this applies, you’ll also need a flashing light to signal when the gate is opening or closing. The recommended mounting height for sensors is between 20 and 24 inches from the ground, but you should adjust based on your property and gate setup. If you have small children or pets, make sure the sensors are positioned low enough to detect them.
For example, if the sensors are mounted higher than your pet’s height, the system may not detect them—posing a safety risk. For added security, you can install extra sensors on posts inside your property. While experienced DIYers may be able to handle installation, hiring a professional is recommended for optimal safety and performance.
Wiring safety sensors for automatic gates
The wiring process depends on the type of sensors you’re using. Common types include:
- Standard sensors, which require two wires on one side and four on the other;
- Battery-powered or reflector sensors, which use four wires on one side and batteries on the other;
- Bus sensors, which only need two wires on each side.
After installation, always test the sensors to ensure the system is working correctly.
