LD-200 / LD-202 Dual Channel Vehicle Loop Detector (12-24V / 100-240V)
✓ Dual-Channel Vehicle Sensing: Monitors two independent ground loops (CH1 & CH2) with a single compact controller unit.
✓ Directional Logic Detection: Built-in microprocessor supports 3 directional flow modes and 3 independent presence/pulse output modes.
✓ 8-Level Sensitivity per Channel: Independent DIP switch adjustment from 0.015% (highest) to 0.8% (lowest) for tailored vehicle profiling.
✓ Anti-Crosstalk Frequency Tuning: 4-step frequency selection (20 kHz to 100 kHz) eliminates interference between adjacent dual loops.
✓ Dedicated Dual Relays: Independent Relay 1 (CH1) and Relay 2 (CH2) N.O./COM outputs for barrier gate operators and toll stations.
✓ Universal 11-Pin Plug-in Base: Standard circular socket enables rapid DIN-rail mounting and tool-free cabinet replacement.
Original price was: $99.00.$79.00Current price is: $79.00.
🚚 Ships within 24-48 hours | 🛡️ 1-Year Quality Warranty
LD-200 & LD-202 DUAL CHANNEL VEHICLE LOOP DETECTOR OVERVIEW
The LD-200 (100–240V AC) and LD-202 (12–24V AC/DC) series dual channel vehicle loop detectors utilize micro-controller technology to process inductance changes across two separate inductive loops embedded in the roadway pavement. Designed for bidirectional traffic control, automated barrier gates, parking garages, and multi-lane tolling stations, the unit functions either as two separate detectors or as an integrated directional logic sensor to identify vehicle approach direction.
Key Operational Advantages:
Intelligent Direction Recognition: Automatically senses vehicle travel direction (CH1 → CH2 or CH2 → CH1), outputting specific pulses to prevent tailgating and wrong-way entry.
Automatic Sensitivity Boost (ASB): Integrates specialized trailer detection logic to maintain continuous presence for high-bed trucks and trailers.
Independent Diagnostic LEDs: Separate green status LEDs for CH1 and CH2 provide real-time visual alerts for loop presence, short-circuits, and open loops.
Flexible Reset Modes: Supports infinite permanent presence or 10-minute auto-reset to avoid stuck barrier arms in unattended parking setups.
TECHNICAL SPECIFICATIONS & PERFORMANCE RATINGS
| Parameter Specification | Technical Rating & Working Limits |
| Channel Configuration | Dual Independent Channels (CH1 & CH2) |
| Operating Voltage | LD-200: 100–240V AC (48–62Hz) | LD-202: 12–24V AC/DC (48–62Hz) |
| Sensitivity Selection | 8 Levels per channel (0.015% Highest to 0.8% Lowest) |
| Frequency Selection | 4-step switch selectable (20 kHz to 100 kHz) |
| Operating Logic Modes | Mode 1–3 (Direction Detection) | Mode 4–6 (Independent Dual Outputs) |
| Relay Outputs | Dual Relays: CH1 Relay (N.O/COM) & CH2 Relay (N.O/COM) |
| Visual Status Indicators | Red LED: Power ON | Dual Green LEDs: CH1 & CH2 Loop Status / Diagnostics |
| System Reset | Push button on front enclosure for instant calibration |
| Presence Hold Time | Permanent Presence or 10-Minute Auto-Reset selectable |
| Base Mounting | Standard 11-Pin Circular Plug-in Socket Base (DIN-Rail Mount) |
11-PIN TERMINAL CONNECTIONS & DIP SWITCH SETUP
Standard 11-Pin Base Terminal Connections:
Pin 1 & Pin 2: Power Input (LD-200: 100–240V AC | LD-202: 12–24V AC/DC)
Pin 3 & Pin 4: CH1 Inductive Sensing Loop Connection
Pin 5 & Pin 6: CH2 Inductive Sensing Loop Connection
Pin 7: CH2 Relay Common (COM)
Pin 8: CH2 Relay Normally Open (N.O.)
Pin 9: Chassis Earth Ground
Pin 10: CH1 Relay Common (COM)
Pin 11: CH1 Relay Normally Open (N.O.)
DUAL LOOP SYSTEM APPLICATIONS & ROADWAY INSTALLATION
Target Applications & Field Deployment:
Bi-Directional Barrier Gates: Automatically determines vehicle travel direction to control single-lane access.
Toll Collection & LPR: Triggers license plate recognition cameras and barrier interlocks[cite: 1, 2].
Parking Guidance: Provides directional pulse output to prevent reverse-entry counting errors[cite: 1, 2].
Industrial Doors: Dual-loop sequential logic enables auto-opening and anti-crush safety[cite: 1, 2].
Loop Installation & Feeder Cable Guidelines:
Loop Sizing: Standard 2m × 1m layout per channel with 1m spacing between CH1 and CH2 loops[cite: 1, 2].
Wiring Specification: Twist feeder lines at least 20 turns/meter back to the cabinet[cite: 1, 2].
Sealing & Mounting: Keep socket base vertical; seal pavement slots flush with epoxy or bitumen[cite: 1, 2].
What’s in the Box:
1x LD-200 or LD-202 Dual Channel Vehicle Loop Detector Unit
1x Standard 11-Pin Circular DIN-Rail Mounting Socket Base
1x Comprehensive User Manual with Dual Loop Wiring & Directional Logic Setup Guide
FREQUENTLY ASKED QUESTIONS & DUAL-CHANNEL TROUBLESHOOTING
Q1: How does direction detection work on the LD-200 / LD-202?
A: When configured in Modes 1, 2, or 3, the detector monitors the activation sequence of CH1 and CH2 loops. Vehicles moving from CH1 to CH2 trigger CH1 output, while vehicles moving from CH2 to CH1 trigger CH2 output, preventing false triggers from opposite-direction traffic.
Q2: What do the LED diagnostic signals mean on each channel?
A: The Red LED indicates Power ON. The Green CH1 and CH2 LEDs indicate: Solid ON = Vehicle detected; Slow Blinking = Short circuit or insufficient loop turns; Fast Blinking = Open circuit or excessive loop turns.
Q3: What should I do if a channel’s green LED is blinking slowly?
A: A slow blinking green LED indicates a short circuit in the loop coil or insufficient wire turns. Lower the operating frequency via DIP switches; if the issue remains, add more wire turns to the ground loop.
Q4: What should I do if a channel’s green LED is blinking rapidly?
A: A fast blinking green LED indicates an open-circuit loop fault or too many wire turns. Increase the operating frequency via DIP switches; if the frequency is still too low, remove wire turns from the loop coil.
Q5: Why must I press the RESET button after changing DIP switch settings?
A: The onboard micro-controller calibrates its loop inductance parameters upon reset or power-up. Pressing the front RESET push button applies and activates new DIP switch configurations immediately.