Project Description

702 Non-Invasive Microloops

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The Canoga™ 702 Microloop is a transducer that converts changes in the vertical component of the earth’s magnetic field to changes in inductance. Vehicles containing vertical components of ferromagnetic material “focus” the earth’s field, increasing the magnetic field at the sensor when vehicles move over the sensor. Changes in inductance can be sensed by a Canoga 9004 vehicle detector. The Canoga™ 702 Microloop sensor’s small size permits easy insertion into a 3-inch (7.6 cm) plastic conduit installed 18–24 inches (46–61 cm) below the road surface. Installing the sensors in a conduit leaves the road surface intact, bypasses the effects of poor pavement conditions and inclement weather, and virtually eliminates maintenance and service requirements.


  • Lower life cycle costs

  • No maintenance, underground installation, protected from weather and traffic

  • Lower service costs. Not affected by environmental factors or pavement deterioration

  • Sensors can be replaced from the roadside without affecting traffic

  • No pavement repair or road maintenance costs; the road surface is not damaged

  • Better installation and efficiency; traffic lanes are not closed for long periods of time

  • Replaces inductive loops for presence and passage detection

  • Ideal for use in poor pavement conditions, brick or cobblestone surfaces

  • Low inductance, allowing 4 Microloop sensors connected in series to one detection channel

  • Accurate, closely spaced vehicles are detected and adjacent lane vehicles rejected


GTT Canoga™ 702 Non-Invasive Mircoloops

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