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Applicable Tax and Freight Charge will be added to Final Invoice.
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FISHER TW-6 TIPS |
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THE TW-6 PERFORMS THREE DIFFERENT
SEARCHES |
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BLIND
LOCATING |
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| Many
locators for underground pipes and cables can only trace from a known
starting point , such as an exposed line, hydrant, or water faucet
(conductive trace). However, the "two-box" M-Scope invented by Dr.
Gerhard Fisher in 1931 can locate and trace any underground pipe or
cable when no starting point is known (inductive trace). Today's TW-6 is
a direct descendent of that first M-Scope invented by Dr. Fisher and is
capable of conducting a "blind" search of an area for an underground
pipe or cable that has no know starting point. Nonmetallic pipe may be
located inductively or conductively if tracer tape or wire is placed in
the trench above the line. |
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INDUCTIVE LOCATING
(Click for Video) |
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| Using the
3-piece handle (Item P50502) position the Transmitter Box behind, while
the Receiver Box is ahead. Walk a grid pattern to discover the location
of buried metallic objects. Watch the meter on the TW-6 Transmitter Box
and listen for the signal tone to discover the location of a metallic
object, such as a pipe, cable or vault box. Mark the pavement with chalk
for signal location. Soon a pattern will emerge that shows the location
of the underground object you may be locating. If you are looking for a
valve, tee or riser simply walk over the pipe and you will see a higher
signal from the meter and hear a higher tone indicating a larger mass of
metal. |
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INDUCTIVE TRACING
(Click for Video) |
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| When one point of a underground linear conductor (such as a pipe or cable) is known,
place the Transmitter Box of the TW-6 over it and trace in either direction. Walk out the
path of the line and swing the TW-6 Receiver Box left and right over the line while
listening for the audio signal tone. As you walk away from the Transmitter Box tracing
farther down the line, the Transmitter signal will become faint, but the Transmitter Box
can be moved closer to you so that tracing can continue to the end of the line. Another
alternative is to raise the sensitivity on the receiver.
Two Person Locating: Each person holds the units with its face towards him and parallel
to the other instrument. Standing at least 30 feet away (to prevent air coupling), the two
people walk parallel to each other from the curb toward the opposite side of the street.
When the two operators are directly over the pipe the receiver will give you the maximum
signal.
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CONDUCTIVE TRACING
(Click for Video) |
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| This is the preferred method for tracing because the Transmitter Box makes a direct
physical hook-up with the line to be traced. Plug the TW-6 Ground Plate Assembly into the
Transmitter with one wire going to an alligator clamp that is attached to the pipe,
non-energized wire or conduit. This concentrates the signal on the known line to be
traced, and there is less chance of the signal being induced to a nearby or adjacent line.
Tracing distances are increased 25-50 percent over the Inductive method. Nonmetallic pipes
may be traced Conductively if the Ground Plate Assembly is attached to a plumber's
"snake" or electrician's "fish tape" running inside of the pipe. |
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