Elektrisch verschmelzender Markierer.

摘要

An electrofusion marker which fuses two pipe sections together and acts as a passive electronic marker. The electrofusion marker includes a tubular thermoplastic fitting having a coil therein, which is temporarily energized by a power supply. This heats the fitting, causing it to fuse with the pipe sections. The coil doubles as an inductor, and a capacitor connected in parallel with the coil creates a resonant LC circuit. After the pipe sections have been fused together and buried, the joint may be thereafter located by emitting a signal into the ground, which is picked up by the resonant circuit and re-radiated. The radiated signal is detected by a receiver, indicating location of the electrofusion marker and joint.