Designed for parking barrier and vehicle access control applications, this loop detector provides reliable vehicle presence detection and anti-crush protection for safer, more efficient gate operation. Installed with an inductive loop beneath the road surface, the detector identifies changes in loop inductance when a vehicle enters the detection area and sends relay signals to the connected barrier controller. It is suitable for parking entrances, residential communities, commercial buildings, industrial facilities, toll lanes, and other controlled vehicle access points.

A key function is permanent vehicle presence detection. When permanent presence mode is enabled, the detector continuously maintains the presence relay output for as long as the vehicle remains above the induction loop. The signal is released only after the vehicle leaves the detection zone. This function is particularly useful beneath barrier arms, where continuous vehicle detection helps prevent the boom from lowering while a car, truck, or other vehicle is still within the safety area.

The detector supports configurable relay functions for both vehicle triggering and continuous presence monitoring. Depending on system requirements, the relay output can be configured for entry pulse, exit pulse, or presence operation. This allows one detector to work with barrier gates, LPR cameras, ticket dispensers, parking controllers, and other access control equipment. Adjustable relay release delays from 0 to 30 seconds provide additional flexibility for delayed barrier closing, continuous vehicle passage, and coordinated control with connected devices.

With a wide 15–2000 μH loop inductance range and 16 selectable sensitivity levels, the detector can be adapted to different loop sizes, installation depths, vehicle types, and site conditions. Automatic Sensitivity Boost helps maintain stable detection for trucks, trailers, and high-chassis vehicles, while four selectable operating frequencies help reduce interference when multiple loops are installed nearby.

For parking facilities requiring dependable barrier safety control, this parking barrier loop detector combines vehicle triggering, permanent presence monitoring, adjustable sensitivity, and anti-crush protection in one practical solution. It helps improve barrier operation by keeping the gate open while a vehicle remains in the protected area and allowing controlled closing only after the vehicle has safely cleared the induction loop.

• 1. 15-2000 μh detection Range
  • The loop detector supports a wide detection range from 15 µH to 2000 µH, accommodating various loop sizes and configurations for versatile application in different traffic detection scenarios. The wide detection range enables our loop detector to detect all kinds of vehicles, motorcycles, cars, Ultra long truck, buses and so on.
• 2. Compact Side
  • The compact and well-engineered housing combines all industry requirements for features and functionality, allowing this detector to be incorporated into any existing traffic detection system.
• 3. LED Diagnostic Capabilities
  • Comprehensive diagnostics capabilities enable accurate diagnosis of loop and installation problems and shows through LED, ensuring optimal performance and reducing downtime.
• 4. Selectable Presence Time
  • The output of the presence relay can be selected to limit a detect output to a fixed time (greater than 30 minutes) while a vehicle remains on the loop, providing flexibility in traffic management.
• 5. Loop Presence Time
  • Interference between adjacent loop detectors can be identified through integral indication and eliminated by adjusting the frequency setting, ensuring reliable operation.
• 6. Two Separate Output Relays
  • Presence Relay A: Provides presence output and can be extended for 0, 2, 5, 8, 10, 15, 20, or 30 seconds, programmable with external 10-way DIP switches.
  • Pulse Relay B: Programmable with external 10-way DIP switches, it offers presence, pulse on entry, pulse on exit, or failed output, enhancing detection flexibility.
• 7. Automatic Sensitivity Boost (ASB)
  • This feature reliably detects large truck-trailer combinations and high-bed vehicles by automatically boosting the sensitivity to maximum upon vehicle detection, ensuring accurate identification.
• 8. Automatic Environment Drifting Compensation
  • Loop detectors (or other sensors) automatically adjust and calibrate themselves to changes in environmental conditions, maintaining detection accuracy and stability despite varying weather and environmental factors.
• 9. 10 Dip Switch
  • The dip swich design on the shell makes the setting of loop detector easier and clearer, which is very user-friendly for users. Users can set all the functions first and then install the loop detector.
• 10. Anti-crosstalk interference.
  • Through the dip Switch, the frequency of the loop detector can be adjusted to prevent crosstalk interference caused by the installation of two loop coils too close.

(1)Power Led: RED Power LED Indicates “Power ON”

• Detecting Led: Continuously On: Indicates vehicle detection.
• Blinking slowly: Indicates loop is short circuit or the number of twists after the loop is not enough.
• Blinking fast: Indicates loop is open circuit or too many twists after the loop.

• Sensitivity of the loop can be adjusted by the trimpot labeled “Sensitivity”. User can select 16 different setting by turning the trimpot with 0 being the least sensitive and “F” being the most sensitive.

  

1. DIP 1 & DIP 2 Setting Special Functions

2. DIP 3 & DIP 4 Setting Relay B Output

3. DIP 5 Setting Automatic Reset

4. DIP 6 & DIP 7 & DIP 8 Setting Relay A Delay

5. DIP 9 & DIP 10 Setting Frequency (40 K to 100 KHz). Used to avoid the interference

• In the application, where two or more loop detectors and sensing loops have been installed, set one detector to high frequency and the other set to low frequency to minimize the effects of cross-talk between the two systems(The sensing loops and detectors should be positioned at least 2m apart).
• Reset Button:Please note: The LD-100 must be reset every time a setting change is made to the Dip switches.

• Install the detector in a weatherproof housing.
• The detector should be as close to the sensing loop as possible.
• The detector should always be installed away from strong magnetic fields.
• Avoid running high voltage wires near the loop detectors.
• Do not install the detector on vibrating objects.

• When the control box is installed within 10 metres of the loop, normal wires can be used to connect the control box to the loop. More than 10 metres requires the use of a 2 core shielded cable. Do not exceed 30 metres distance between control box and loop.

  

The loops are sealed using a “quick-set” black epoxy compound or hot bitumen mastic to blend with the roadway surface.