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78-8130-6151-8 Rev G
Use a ground extension cable,
or wire, and ground rod set-up
between a target pipe/cable and
a gas meter valve/box, or cable/
electrical meter box. This will
isolate the locate signal to the
target pipe/cable section below
the meter/box, between the
grounding points. This provides a
good return path for the tracing
signal. Insulating coupling above
a gas meter valve on a pipe will
isolate the returning signal from
ground and may make locating
more difficult.
1. Connect the 3M™ Dyna-Coupler to the transmitter
Output Jack
[T-6] using the
coupler cable (9011).
2.
Clamp the Dyna-Coupler around the cable or pipe, below any bonds, just before it
enters the earth.
The jaws of the coupler must fully close.
3. Press
Trace
[T-3] to turn on the transmitter. Press again to select 8 kHz, 33 kHz or
133 kHz.
Note: When using a Dyna-Coupler, always select high or maximum output power level
by pressing the Output Level key [T-5] on the transmitter.
C. Induction Method
Transmitter
Hinge
Suspected Cable Path
Near-end ground
Far-end ground
If you cannot make a direct connection, or use the 3M™
Dyna-Coupler Clamp to apply
a locating signal on the target, use the induction method. When nothing is plugged into
Output Jack
[T-6] of the transmitter the unit will be placed into induction mode when it
is turned on. This method uses the internal coil of the transmitter to generate a magnetic
field. This is the least preferred method of applying a signal on a target conductor
because it can easily be picked up by other non-target conductors in the area. However,
it is the preferred method of applying a signal to multiple cables/pipes in the same
trench, and for the ‘two-person sweeping’ application.
3M Dynatel transmitters provide a choice of induction frequencies and output levels.
Higher induction outputs are needed for detecting deeper depths and longer ranges.
The 3M Dynatel™ Advanced Locator 2200M Series 3 Watt transmitters provides
two induction frequencies: 33 kHz and 133 kHz. The 12 Watt transmitter provides
three induction frequencies: 8 kHz, 33 kHz and 133 kHz. The 133 kHz frequency is
