6
1 INTRODUCTION
The Metrotech Model 480B Pipe and Cable Locator is a versatile locating instrument designed for locating
and tracing the path of pipes and cables; detecting energizing 60Hz power lines; and when mounted on an
optional carrying handle, conducting blind searches, ground surveys, and locating underground metal
masses. Depth measurement is accomplished using the triangulation method.
The 480B is of split-box design, half being the Transmitter and half being the Receiver.
The Transmitter generates a signal which is applied onto the pipe or cable to be traced - referred to from
now on as the "conductor". The signal travels along the conductor, becoming weaker as it gets farther
away from the Transmitter. The distance that the signal travels before it becomes too weak to be detected
depends on the method of connection, the type of conductor, the surrounding soil, and the depth of the
conductor.
When you position the Receiver over the targeted conductor, it will detect the signal from the conductor,
enabling the operator to trace the path of the pipe or cable. The signal strength reading on the meter and
the audio tone directs the operator to the path of the conductor.
As with all electromagnetic locating systems, this unit is designed to locate metallic conductors only. The
word "conductor, pipe, or cable" refers to a metallic conductor throughout this manual.
Figure 2-1: Model 480B Pipe and Cable Locator: Standard Equipment