Single Channel Vehicle Loop Detector – Barrier Gate & Parking Lot
Single Channel Vehicle Loop Detector – Barrier Gate & Parking Lot
Asia-Teco Single Channel Vehicle Loop Detector – Model 120B
Upgrade your parking lot, driveway gate, or barrier gate system with the Asia-Teco 120B Single Channel Inductive Loop Vehicle Detector. Engineered for reliable, high-speed vehicle detection, this CE-certified unit integrates seamlessly with automatic gate openers and barrier systems — including Northtech-compatible setups. With a lightning-fast 10ms reaction time, adjustable sensitivity, and wide voltage compatibility, it's a dependable choice for commercial parking facilities, residential driveways, and traffic control applications.
Made in Mainland China.
Why Choose the Asia-Teco 120B Loop Detector?
- Fast 10ms Reaction Time — Detects vehicles almost instantly for smooth, uninterrupted gate operation.
- 4-Level Adjustable Sensitivity — Fine-tune detection to suit motorcycles, cars, trucks, and everything in between.
- Wide Voltage Compatibility — Supports AC 220V, AC 110V, and DC 24V power inputs for versatile installation.
- Broad Frequency Range (20 kHz–170 kHz) — Minimizes interference when multiple detectors operate nearby.
- Relay Output (240V / 5A) — Direct, low-maintenance relay switching for gate and barrier controllers.
- LED Status Indicators — Green Channel LED and Red Power LED provide at-a-glance system status during tuning and operation.
- Durable Operating Range — Functions reliably from -20°C to +65°C (-4°F to +149°F), ideal for outdoor installations.
- Self-Healing Fault Detection — Automatically identifies and recovers from minor loop faults without manual intervention.
- CE Certified — Meets European safety and electromagnetic compatibility standards.
Technical Specifications
| Specification | Detail |
|---|---|
| Brand | Asia-Teco |
| Model | 120B |
| Supply Voltage | AC 220V / AC 110V / DC 24V |
| Power Consumption | 4.5 VA |
| Output Relay | 240V / 5A |
| Frequency Range | 20 kHz – 170 kHz |
| Reaction Time | 10 ms |
| Sensitivity | 4 Adjustable Levels |
| Loop Inductance | 50 μH – 1000 μH (ideal: 100–300 μH) |
| Maximum Coil Size | 8m × 1m |
| Lead Wire (Ground Sensing) | Best within 10 meters (twisted pair) |
| Loop Connection Wiring | Max 20 meters, twisted ≥20 times/meter |
| Operating Temperature | -20°C to +65°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | <90% (non-condensing) |
| Housing Size (L×W×H) | 78 × 40 × 108 mm |
| Certification | CE |
| Country of Origin | Mainland China |
Installation Tips
- Mount the detector in a weatherproof enclosure, as close to the inductive loop as practical.
- Keep the unit at least 10mm away from other devices or box walls to ensure proper airflow and signal integrity.
- Avoid installing near heat sources or high-vibration equipment.
- Use twisted-pair lead wire (minimum 20 twists per meter) for loop connection, with a maximum lead length of 20 meters.
- Loop inductance should ideally fall between 100 μH and 300 μH for optimal detection accuracy.
Operation & LED Indicators
On power-up and during auto-tuning, both the green Channel LED and red Power LED illuminate for approximately 2 seconds. The green LED turns off once tuning is complete. When a vehicle is detected over the loop, the green Channel LED lights up. The red Power LED remains on as long as the unit is energized. If a loop fault occurs, the Channel LED will flash to indicate the issue — and if the fault is self-healing, the detector continues operating automatically.
For more information on traffic detection systems and road safety technology, visit the Federal Highway Administration or refer to the National Institute of Standards and Technology (NIST) for standards on electromagnetic compatibility and measurement.
Frequently Asked Questions
Q: Is the Asia-Teco 120B loop detector compatible with Northtech barrier gate systems?
A: Yes, the 120B single channel vehicle loop detector is compatible with Northtech parking lot barrier gates and other standard relay-input gate controllers. Its relay output (240V/5A) connects directly to most automatic gate openers and barrier gate systems.
Q: What power supply does the loop detector require?
A: The Asia-Teco 120B supports multiple voltage inputs: AC 220V, AC 110V, and DC 24V. Always check the label on your specific unit to confirm the voltage rating before installation.
Q: How do I adjust the sensitivity of the vehicle loop detector?
A: The 120B offers 4 adjustable sensitivity levels, allowing you to calibrate the detector for different vehicle types — from motorcycles and small cars to large trucks. Sensitivity is typically adjusted via a DIP switch or dial on the unit itself.
Q: What is the maximum loop size supported by this detector?
A: The maximum coil size is 8 meters × 1 meter, with a loop inductance range of 50 μH to 1000 μH (ideally 100–300 μH). The maximum lead wire length from the loop to the detector is 20 meters using twisted-pair cable.
Q: Can this detector be used outdoors?
A: Yes. The unit operates reliably in temperatures from -20°C to +65°C and tolerates up to 90% relative humidity (non-condensing). It should be housed in a suitable weatherproof enclosure for outdoor installation.