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transformer box, a telephone switch box, a gas meter, etc.). The clamp then induces
a current onto the pipe or cable. In this mode, it is not necessary to provide a return
path for the induced current to the transmitter. The induced current will travel on the
pipe or cable for a certain distance, making it possible to trace it.
Induc tive
In the inductive mode, the transmitter imposes a signal of the selected
frequency onto the pipe or cable to be traced. It does so by energizing
an inductive antenna built into the case. The transmitter is placed on
the ground in a direction perpendicular to the pipe or cable being
traced. The inductive antenna then induces a current onto the pipe or
cable. In this mode, it is not necessary to provide a return path for the
induced current to the transmitter. The induced current will travel on the
pipe or cable for a certain distance, making it possible to trace it.
So nde
In the sonde mode, the transmitter is not used at all. This mode is used to
trace non-metallic pipes or metallic pipes where other modes are
inapplicable or inefficient. A small beacon transmitter, or sonde, is pushed
through the pipe, and the receiver searches for the signal emitted by the
sonde. Since the signal being traced by the receiver is produced by the
sonde and not travelling along the pipes, there are some differences in the
way the receiver is used. Due to the nature and strength of the sonde
signal, it is necessary to have some idea of where the sonde is (in order to
narrow the search area to a radius of several feet centered around the
sonde). Since the sonde is “guided” by a device that is under the control of
the work crew and it often has a camera attached to it, having a general
idea of where the sonde is located is typically not a problem.
For additional information on sonde locating and techniques, check the
training section of our website at
www.schonstedt.com/training .
Micro Mini Sonde-512 Hz Mini Sonde-512 Hz