AC220V 170kHz Double Channel Vehicle Loop Detector for Parking and Access Control

Standard Double Channel CE Certificate Car Parking Vehicle Loop Detector PD232

This dual microprocessor-based loop detector is specifically designed for parking and vehicle access control applications. Its primary function is to detect vehicle presence through inductance changes caused by vehicles passing over a wire loop buried under the road surface.

The detector must be installed in a convenient weatherproof location as close to the loop as possible.

A correct loop configuration and detector installation will ensure a successful inductive loop detection system.

When two loop configurations are in close proximity, magnetic field overlap can cause false detects and detector lock-up. Crosstalk can be eliminated by:

• Careful choice of operating frequency - closer loops require further apart frequencies
• Maintaining minimum spacing of 7 feet between loops where possible
• Careful shielding of feeder cables if routed with other electrical cables, with shield earthed at detector end only

Reinforced steel below road surface reduces inductance and sensitivity. In this case, add two additional turns of wire to the loop. Ideal spacing between loop cable and steel reinforcing is 6 inches. Keep slot depth as shallow as possible, ensuring no part of the loop or feeder remains exposed after sealing compound application.

• Loop must consist of insulated wire with minimum copper cross-sectional area of 1.5 square millimeters
• Feeder should be same material, twisted minimum 20 twists per meter
• Joints in loop or feeder are not recommended - if necessary, solder and terminate in waterproof junction box
• For long feeders or routing with other electrical wiring, use screened cable with screen earthed at detector end only