Field Measurements 5:34
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
Figure 5.17 Example of a Conductive Pipe Locator
Inductive
An inductive locator uses a radio frequency AC signal, which is induced in
the structure to be located by an induction coil that is part of the transmitter.
Inductive type locators permit the location of underground metallic
structures where it is not feasible to attach a wire directly to the structure, as
in the case of the conductive locator. This is accomplished by a coil in the
transmitter that establishes a strong magnetic field that induces an AC
current in the structure. The AC field surrounding the structure can then be
detected in a manner similar to that described for the conductive locator.
Figure 5.18 illustrates the principle of the inductive locator.
Pipe
Transmitter
Receiver
Figure 5.18 Inductive Pipe Locator Principle
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