Table of Contents
Advertisement
3-2 Direct mode & Induction mode
Magnetic Field
PRINCIPLE & USAGE
Current
Inducted current
【How to select modes】
☞ Condition of pipeline
Case 1 : There is a part exposed on the ground
➡ Direct Mode
Case 2 : There are no parts exposed on the ground
➡ Induction Mode
【Direct Mode】
Connect the target pipe and the transmitter with a cable and apply
the electric current directly to the pipeline and generate a mag-
netic field that can be detected by the receiver.
【Induction Mode】
A magnetic field is generated by the transmitter, and an electric
current is generated in the pipeline from the magnetic field and
simultaneously secondary magnetic field is generated to be
detected by the receiver.
- 15 -
Advertisement
Table of Contents
