A METHOD OF AND APPARATUS FOR DETERMINING IF A BURIED CURRENT CARRYING CONDUCTOR IS BURIED ABOVE A PREDETERMINED MINIMUM DEPTH

摘要

A detector 1 for detecting a current carrying conductor has a pair of vertically spaced antennae (3, 5) to detect the magnetic radiation produced by a current carrying conductor as a result of one or both of the mains power supply or an electromagnetic signal which is induced in the conductor by a dedicated signal transmitter. The detector (1) continuously calculates the depth of a buried conductor and if the buried conductor is above a predetermined minimum depth then the detector 1 triggers an audio and/or visual alarm. By reducing the sensitivity of the antennae (3, 5), the lateral offset range for which the alarm sounds is reduced and the location of a buried conductor can be determined.