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The audio signal sounds with the highest frequency
directly above the object and the LCD display 6 sig-
nals the highest value both with the numerical indica-
tion 7 and with the bar diagram 9.
Note: Please observe that the measuring tool not only
responds to ferro-magnetic objects, but also to ferro-
magnetic items on your body.
Detection Under Water (see figure D)
Ferro-magnetic objects can also be located under
water.
Immerse the measuring tool only until below
the plastic housing. Penetrating water can dam-
age the measuring tool's electronics.
Detection Next to a Metal Fence
(MT100/MT200) (see figure E)
With the sensitivity of the sensor set to low, hold the
measuring tool horizontal and at a right angle to the
fence.
During your search, guide the measuring tool over the
ground with uniform clearance to the fence.
The signal intensifies while approaching the ferro-
magnetic object, and returns to the base value when
directly above the object. Any further position change
leads to an increase of the signal.
Detection Next to a Metal Fence
(MT102/MT202) (see figure F)
Position the measuring tool at the desired clearance
to the fence and press the erase button 11.
Afterwards, scan the terrain in a line parallel to the
fence, paying attention that the measuring tool is also
moved parallel to the fence.
When the distance to the fence is changed, the pro-
cedure must be repeated.
Signal Patterns
The following figures show signal patterns of different
ferro-magnetic objects.
Manhole Covers
Large ferro-magnetic objects generate double signals
according to the image shown above.
The centre of the manhole cover is determined by
moving the measuring tool left and right.
2 610 A15 110 • 23.6.09
The centre between both signal peaks indicates the
centre of the manhole cover. The signal drops rela-
tively strong here.
Steel Pipes
Pipe sleeves, bends and ends provide conclusive sig-
nals.
Surveying Marks, Slide-valve Rods
Standing pipes or bars can be localised very well.
They act as very strong magnets and generate conclu-
sive signals.
Please observe that misleading or deceptive signals
can be generated hereby. According to the image
shown above, the charactersitic of the signal drops to
the basic value just ahead of the bar/pipe/rod.
This is due to the course of the magnetic field. At
these points, the field runs at a right angle to the loca-
tor rod, meaning, there is no interference of the
probes.
This phenominon can be used specifically to locate
bars and rods, as the signal typically drops to the
basic value just ahead of the object and strongly
increases just after the object.
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