If the transmitter and receiver units are oriented vertically and parallel to the buried pipe, what happens?

• A. Minimum efficiency
• B. No effect
• C. Not specified
• D. Maximum efficiency

Answer: (D)

Maximizing the signal comes from how well the transmitter’s field couples into the buried conductor and how effectively the receiver picks up that field. When the transmitter and receiver are oriented vertically and run parallel to the buried pipe, the magnetic field created by the current in the pipe aligns with the receiver’s sensing path along the pipe’s length. This mutual alignment increases magnetic flux linkage between the pipe and the receiver, producing the strongest signal. That stronger signal translates to maximum efficiency in locating the pipe. If you’re rotated away from this alignment, the flux linkage drops and the signal weakens.