Product Manual

sensitivity and begin searching the area as de-
scribed in the search and sweep section of this
manual.
Generally the larger the pipe the deeper it can be
located. 4” diameter cast iron pipe joints can be
located at depths up to 10 feet assuming there is
no significant interference from foreign objects.
In pipelines that run east and west, you may find
that the location of the joints can be slightly off from
the point where you detect the peak signal.
4.5 Manhole covers
A strong magnetic field is produced by the support
collar that supports manhole lids. This is what you
will detect with the Mag Horn. Your peak signals will
occur at the outer edges of the cover.
By reducing outer sensitivity setting you can easily
locate and trace the edges of manhole covers and
reduce the amount of work required to uncover the
lid.
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