Single Channel Inductive Loop Vehicle Detector – Barrier Gate
Single Channel Inductive Loop Vehicle Detector – Barrier Gate
Asia-Teco Single Channel Inductive Loop Vehicle Detector (Model 120B)
Upgrade your parking lot, driveway gate, or barrier system with the Asia-Teco Model 120B Single Channel Loop Vehicle Detector. Engineered for reliable, traffic-inductive detection, this CE-certified unit integrates seamlessly with automatic gate openers, barrier arms, and access control systems — including Northtech-compatible setups. Whether you're managing a commercial parking facility or a residential gated entry, the 120B delivers fast, accurate vehicle sensing every time.
Why Choose the Asia-Teco 120B Loop Detector?
- Universal Voltage Compatibility: Operates on 230V AC, 115V AC, 24V DC/AC, or 12V DC/AC — making it adaptable to virtually any installation environment.
- Wide Temperature Range: Performs reliably from -20°C to +65°C, so it works year-round in demanding outdoor conditions.
- Adjustable Sensitivity: Four sensitivity increments let you fine-tune detection to suit your specific loop geometry and vehicle types.
- Fast Reaction Time: 10ms response ensures the gate or barrier triggers without perceptible delay.
- Self-Healing Fault Detection: The unit monitors loop health continuously; if a recoverable fault occurs, the detector keeps operating and signals the issue via LED indicator.
- CE Certified: Meets European conformity standards for safety and electromagnetic compatibility.
- Compact Housing: Slim 78 × 40 × 108 mm form factor fits easily inside a weatherproof control cabinet.
How It Works
A wire loop is embedded in the pavement surface beneath the gate or barrier. When a vehicle passes over the loop, it changes the loop's inductance. The 120B detector senses this change within 10ms and triggers its output relay, signaling the gate or barrier controller to open. The green Channel LED illuminates whenever a vehicle is detected, and the red Power LED remains on as long as the unit is energized. During the auto-tuning sequence at startup, both LEDs light briefly (~2 seconds) before the system is ready for operation.
Technical Specifications
| Model | 120B |
| Supply Voltage | 230V AC / 115V AC / 24V DC-AC / 12V DC-AC |
| Voltage Tolerance (AC) | +10% / -15% |
| Voltage Tolerance (DC) | ±15% |
| Power Consumption | 4.5 VA |
| Output Relays | 240V / 5A |
| Operating Temperature | -20°C to +65°C |
| Storage Temperature | -40°C to +85°C |
| Frequency Range | 20 kHz to 170 kHz |
| Reaction Time | 10 ms |
| Signal Hold Time | Unlimited (max 10 min when loop is permanently covered) |
| Sensitivity | Adjustable in 4 increments |
| Loop Inductance | 50µH – 1000µH (ideal: 100µH – 300µH) |
| Max Loop Wire Length | 20 metres, twisted ≥20 times per metre |
| Housing Dimensions | 78 × 40 × 108 mm (L × W × H) |
| Security Mode | Fail Secure |
| Certification | CE |
| Country of Origin | Made in Mainland China |
Installation Tips
- Mount the detector in a weatherproof location as close to the inductive loop as possible.
- Keep the unit away from heat sources and maintain at least 10 mm clearance from surrounding devices or enclosure walls.
- Loop connection wiring must not exceed 20 metres and must be twisted a minimum of 20 times per metre to minimize interference.
- Ideal loop inductance is 100µH to 300µH for optimal detection performance.
Compatibility
The Asia-Teco 120B is compatible with Northtech barrier gates and most single-channel automatic gate opener systems that accept inductive loop detector signals via relay output.
For general electrical safety guidelines when installing access-control and gate systems, refer to the U.S. Consumer Product Safety Commission (CPSC) and OSHA's Electrical Safety resources.
Frequently Asked Questions
Q: Is the Asia-Teco 120B loop vehicle detector compatible with Northtech barrier gate systems?
A: Yes. The 120B is specifically noted as compatible with Northtech parking lot barrier gate systems, as well as most other automatic gate openers that accept a standard relay-based inductive loop detector signal.
Q: What voltage options does the Model 120B single channel loop detector support?
A: The 120B supports multiple supply voltages — 230V AC, 115V AC, 24V DC/AC, and 12V DC/AC. Check the label on your specific unit to confirm which voltage it is configured for before installation.
Q: How do I know if the loop detector has detected a vehicle or if there is a fault?
A: The unit features two LED indicators. The green Channel LED illuminates whenever a vehicle is detected over the inductive loop. If a fault is present, the Channel LED will flash. The red Power LED remains constantly on whenever the unit is powered. During startup tuning (approximately 2 seconds), both LEDs light simultaneously.
Q: What is the maximum loop wire length for this vehicle loop detector?
A: The connection wiring from the inductive loop to the detector must not exceed 20 metres. The wire must also be twisted at least 20 times per metre to minimize electromagnetic interference and ensure reliable detection.
Q: Can this loop detector be used outdoors in extreme temperatures?
A: Yes. The Asia-Teco 120B has an operating temperature range of -20°C to +65°C, making it suitable for year-round outdoor use in most climates. For storage, the unit can withstand temperatures from -40°C to +85°C.