For best results, place the sensing head firmly against the surface
being explored. While it does not have to be on a horizontal plane, the
instrument works best when it is free standing, since the circulation of
blood in the hands will set up detectable vibrations.
The instrument performs equally well on soil, ice, hard packed snow,
pavement or any solid substance. Light packed snow or grassy surfaces
tends to distort or muffle the leak sounds. In these cases it is
suggested that you dig down to solid ground or drive a metal rod into
the ground, leaving approximately two inches of the rod above the
ground.
Place the disc on top of the rod and listen. In addition to the rush of
water you will some times hear an erratic clicking sound. This is caused
by rocks and gravel banging against the pipe in the high pressure stream
of leaking water. Remember that the Geophone is designed and built for
detection of vibrations in solid substances not in gaseous media.
Using
drawings or pipe locators, first find the exact location of the main.
Begin searching in the spot where you most suspect the leak to be. Place
the sensing heads on the ground above the main, spaced approximately
three feet apart. The sounds you hear may reach one ear sooner than the
other.
By moving the heads you will reach a spot where the sound is of the same
intensity in both sensing heads and reaches both ears at the same time.
You are now directly above the leak. |
