Loop Detectors & Gate Safety Sensors: How to Stop Automatic Gates Closing on Cars (Pakistan 2026)
Quick answer: Automatic gates and parking barriers need safety sensors so they never close on a car or a person. The two main types are a loop detector, which senses vehicles through a wire loop cut into the road (Rs 9,500 for a dual-channel unit at ZZ Marts), and an infrared (IR) beam sensor, which detects anything crossing the gateway (from Rs 2,550). For full protection, most sites use both, plus a motion sensor or control panel to match how the gate is used.
Gate safety and control prices in Pakistan (2026)
| Product | Price (PKR) | What it does |
|---|---|---|
| Loop Detector – Dual Channel | Rs 9,500 | Detects vehicles over a ground loop; opens or holds the barrier |
| ABT-15 IR Beam Sensor (15m) | Rs 2,550 | Infrared beam across the gateway |
| Single Infrared Beam Sensor | Rs 4,800 | Perimeter and gateway safety beam |
| High-Range Motion Sensor for Automatic Gates (12V/24V) | Rs 7,500 | Detects approaching movement |
| Gate Push Button Panel (Up / Stop / Down) | Rs 2,249 | Manual control station |
| Gate Push Button Panel (Up / Down / Stop / Start) | Rs 2,999 | Four-button control station |
| Industrial Key Switch Control Box | Rs 1,649 | Key-operated gate control |
| RF Wireless Remote Relay (2 Button) | Rs 2,199 | Remote open/close control |
Prices as listed on ZZ Marts. See the full range in Gate Barriers & Automation.
How a loop detector works
A thin wire loop is cut into the road surface in front of (or under) the gate or barrier and connected to the loop detector. When a car stops over the loop, its metal body changes the loop's signal and the detector triggers a relay. That relay can open a barrier automatically as a car arrives, or hold it open until the car has fully passed, so the arm never drops onto the vehicle. A dual-channel detector handles two loops, for example one for entry and one for safety under the barrier.
Because it only reacts to large metal objects, a loop detector ignores people and animals, which is why it is usually paired with a beam sensor.
How an infrared beam sensor works
An IR beam sensor sends an invisible beam across the gateway. If anything breaks the beam while the gate is closing, whether a car, person, child or pet, the gate controller stops or reverses. This is the most important safety device on any automatic sliding or swing gate. The ABT-15 covers openings up to 15 metres.
Which sensors does your gate need?
Home sliding or swing gate: at least one IR beam sensor across the opening. Add a remote relay or keypad for convenience.
Office or apartment parking barrier: a loop detector so the arm opens for cars and never lowers onto one, plus an IR beam for pedestrians.
Factory or warehouse gate: IR beams, a loop detector for vehicles, and a push button or key switch panel for the guard room.
Busy commercial entrance: add a high-range motion sensor to detect approaching traffic.
Pairing sensors with a gate motor
Sensors connect to your gate motor's controller. We stock sliding gate motors including the PYM-B024 smart sliding gate opener (Rs 64,500) and the ZZ-2338 automatic sliding gate motor (Rs 91,500). For a full breakdown of gate motor costs, see our automatic gate opener price guide. Our Karachi and Lahore teams supply and install complete gate systems.
Frequently asked questions
What is a loop detector for a gate barrier?
A loop detector is connected to a wire loop cut into the road surface. When a vehicle stops over the loop, the detector senses the metal and signals the barrier or gate, either to open it or to keep it from closing on the car. A dual-channel loop detector costs Rs 9,500 at ZZ Marts.
What is the difference between a loop detector and an IR beam sensor?
A loop detector senses vehicles through a wire loop in the ground and ignores people. An infrared beam sensor detects anything that breaks its beam across the gateway, including people and animals. Many gates use both for full protection.
Do I need a safety sensor on an automatic sliding gate?
Yes. Without a safety sensor, an automatic gate can close on a car, child or pet. An IR beam sensor across the opening, costing from Rs 2,550, is the minimum; adding a loop detector protects vehicles.
Where can I buy gate safety sensors in Pakistan?
From ZZ Marts (Zam Zam Traders), operating since 2005 with stores in Karachi and Lahore and nationwide delivery, free over Rs 5,000.
Related: Gate barriers & automation · Automatic gate opener price · Security Equipment Price Index
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