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Armada Technologies
The Pro900™ Advanced Underground Locator
Introduction: Theory of Locating - C
transmitter and a receiver. In the case of the Pro900™ model, the
transmitter is in the long gray box and the receiver is a yellow and black
wand. In operation, a transmitter places a specific tracing signal onto the
metallic conductor you are trying to locate. This placing of an AC signal
onto a cable produces an electrical current and an electromagnetic field
around that cable. If the wand is close enough, this signal is received and
amplified by the wand.
It is very important to understand that the circuit you are creating follows
the laws of physics and electricity. A cable transmitter creates an electrical
current (AC) that travels down the cable, through grounding to the earth,
and then back to the transmitter through the ground stake. The tracing
signal will always travel on the path of least resistance. If there is too much
resistance or no circuit path, no current will flow and no locate will be
possible. So, keep in mind that when a signal is heard, it is because the
signal has a complete path that is creating an electrically friendly way for
the signal to travel back to the transmitter. The signal doesn't just
randomly wander through the dirt. It follows a path provided for it, whether
it is a pipe, wire, reinforcing bar, etc.
It is also important to note that in the tracing circuits, a return path needs
to be present. Basically, the return path completes the circuit. In most
cases, this will be the earth ground as the signal transmits down the cable
and returns to the ground stake. However, any return is possible, so a
common wire could work. Or if you have a looped wire, like a dog fence,
the loop itself returns to the start and therefore provides a 'ground' instead
of the ground stake. You don't have to use a ground stake, but you do
have to give the signal a way to return to the transmitter.
Power – The Pro900™ has two options for powering the
transmitter: AC mains power or internal batteries. The AC adapter
is useful when 120 VAC power outlets are available nearby. The
adapter provides constant power and does not diminish batteries.
To use the AC adapter, simply insert the round plug of the adapter
into the "12 V" external power receptacle on the transmitter panel
Pro900™ LOCATOR USER GUIDE
able locators consist of a
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