LD-100 / LD-102 Single Channel Vehicle Loop Detector (12-24V / 100-240V)
✓ Inductive Loop Metal Sensing: High-accuracy detection eliminates false triggers from pedestrians or animals.
✓ 16-Level Rotary Sensitivity: Precise trimpot tuning (0 to F) reliably senses motorcycles, cars, and trailers.
✓ Dual Relay Outputs: Presence Relay A (0-30s delay) and configurable Multi-Function/Fault Relay B.
✓ 4-Step Anti-Crosstalk Frequencies: 20kHz–80kHz frequency switching prevents multi-lane interference.
✓ Universal 11-Pin Plug-in Base: Standard octal base enables quick DIN-rail mounting and tool-free replacement.
Original price was: $89.00.$69.00Current price is: $69.00.
🚚 Ships within 24-48 hours | 🛡️ 1-Year Quality Warranty
LD-100 & LD-102 Inductive Vehicle Loop Detector Overview
The LD-100 and LD-102 series single channel vehicle loop detectors utilize digital micro-controller technology to sense changes in magnetic inductance when metallic vehicles pass over ground-embedded loops. Engineered for parking barrier gates, commercial sliding doors, overhead high-speed doors, and automated toll systems, the detector delivers rapid vehicle detection and anti-crush safety protection.
Key Operational Advantages:
Ultra-Fast Response Time: 10ms to 90ms fast switching speed ensures immediate gate reaction to prevent barrier arm collisions.
Automatic Sensitivity Boost (ASB): Built-in logic filter maintains active detection when high-bed trucks or multi-axle trailers cross the sensing loop.
Real-Time Diagnostic LED: Dual LEDs indicate power status, vehicle presence, short circuits, and open-loop conditions in real time.
Industrial Grade Reliability: Operates stably in harsh environments from -40°C to +70°C (-40°F to +158°F) with up to 95% non-condensing humidity.
TECHNICAL SPECIFICATIONS & SELECTION GUIDE
| Parameter Specification | Technical Rating & Working Limits |
| Self-Tuning Inductance Range | 20 μH to 2000 μH |
| Sensitivity Adjustment | 16-way selectable (Highest: 0.010% ΔL/L, Lowest: 2.56% ΔL/L) via Rotary Trimpot |
| Operating Frequency | 4-step switch selectable (20 kHz to 80 kHz) |
| Power Requirements | LD-100: 100–240V AC (48–62Hz) / LD-102: 12–24V AC/DC (48–62Hz) |
| Operating Temperature Range | -40°C to +70°C (-111°F to +158°F) |
| Relay Response Times | Turn-on: 10–90 ms / Turn-off: 10–90 ms |
| Visual Status Indications | Red LED: Power Indicator / Green LED: Channel & Fault Diagnostics |
| Output Relays | Dual Relays: Presence Relay A & Multi-Function / Fault Relay B |
| System Reset | Push button on front faceplate |
| Operating Humidity | Up to 95% Relative Humidity (non-condensing) |
11-PIN CONNECTIONS & DIP SWITCH CONFIGURATION
Standard 11-Pin Terminal Configuration:
Pin 1 & 2: Power Input (LD-100: 100–240V AC | LD-102: 12–24V AC/DC)
Pin 3, 4, 11: Relay B (N.O / COM / N.C) – Pulse, Presence & Fault Output
Pin 5, 6, 10: Relay A (N.O / COM / N.C) – Vehicle Presence Output
Pin 7 & 8: Inductive Sensing Loop Coil Input
Pin 9: Chassis Earth Ground
SYSTEM APPLICATIONS & INDUCTIVE LOOP INSTALLATION GUIDE
Target Applications & Field Deployment:
Automatic Barrier Gates: Provides vehicle safety presence sensing to prevent boom arms from lowering onto vehicles.
Driveway Swing & Sliding Gates: Automatically triggers commercial gate operators for seamless entry and exit.
Automated Toll Lanes & LPR: Provides reliable trigger signals for license plate cameras and ticket dispensers.
Vehicle Counting: Delivers rapid output pulses for accurate vehicle counting and traffic management.
Loop Installation & Wiring Requirements:
Wire Specification: Use insulated multi-strand copper wire (32/020; 32 strand, 2mm diameter).
Loop Perimeter & Turns: 3–4m (6 turns) | 4–6m (5 turns) | 6–10m (4 turns) | 10–20m (3 turns) | >20m (2 turns).
Feeder Cable: Twist feeder wires at least 20 turns per meter back to the cabinet. Distances over 10m require 2-core shielded cable (maximum 30m).
Ground Sealing: Seal ground slots using quick-set epoxy compound or hot bitumen mastic flush with roadway pavement.
What’s in the Box (Standard Package):
1x LD-100 or LD-102 Single Channel Vehicle Loop Detector Unit
1x Standard 11-Pin Circular DIN-Rail Mounting Socket Base
1x Comprehensive User Manual with Wiring & Loop Cutting Guidelines
FREQUENTLY ASKED QUESTIONS & LED TROUBLESHOOTING
Q1: What do the faceplate LED indicators signify during operation?
A: Red LED indicates Power ON. Green LED indicates loop status: Solid ON = Vehicle detected; Slow Blinking = Loop short-circuit or insufficient coil turns; Fast Blinking = Open loop circuit or too many coil turns.
Q2: What should I do if the green LED indicator is blinking slowly?
A: A slow blinking green LED means the inductive loop has a short circuit or the number of turns is insufficient. Lower the operating frequency via DIP switches 9 & 10. If the frequency is still too high, you must add more wire turns to the ground loop.
Q3: What should I do if the green LED indicator is blinking rapidly?
A: A fast blinking green LED indicates an open-circuit loop fault or excessive wire turns. Increase the operating frequency via DIP switches 9 & 10. If the frequency is still too low, remove some turns from the loop coil.
Q4: How do I eliminate crosstalk interference between two adjacent loop detectors?
A: Keep the sensing loops spaced at least 2 meters apart. Set one detector unit to High Frequency (DIP 9 & 10 OFF) and the second unit to Low Frequency (DIP 9 & 10 ON) to avoid electromagnetic cross-talk.
Q5: Why does the detector not respond after I change the DIP switch settings?
A: The detector must be reset every time a configuration change is made to the DIP switches. Press the front RESET push button to apply and re-tune new settings.