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Lath and Plaster
Because of the uneven thickness of the
plaster, it is difficult to detect wood studs using
the wood detection mode. It will probably be
easier to locate the studs by changing to the
metal-detection mode to locate the nails that
hold the lath to the studs.
Lath and Plaster with Metal Mesh
Reinforcement
(See SCANNING IN METAL–DETECTION
MODE).
Textured or Acoustic Walls and Ceilings
When scanning a wall or ceiling with an
uneven surface, place thin cardboard on the
surface to be scanned and scan over the
cardboard. In wood-detection mode, calibrate
with cardboard in place.
Wallpaper
If paper contains metallic foil, metallic fibers,
see SCANNING IN METAL-DETECTION
MODE. If paper is wet, it must be allowed to
dry before scanning.
Wood Flooring, Wood Subflooring and
Drywall Over Plywood Sheathing
Because of the thickness of these materials, it
is difficult to detect wood joists or studs using
the wood-detection mode. It will probably be
easier to locate these items by changing to the
metal-detection mode to locate the nails that
hold the materials to the joists or studs.
Carpeting
The DMD4 cannot detect wood studs and
joists through carpeting. It might be possible to
use the metal-detection mode to locate nails
or screws that were used to attach the wood
floor to the joist.
The multi-detector can indicate “live”
wires/conductors with 50 or 60 Hz of 120V AC
or at higher voltages. If other wires/conductors
are detected, they are indicated only as metal
objects. “The multi-detector automatically
scans for “live” wires/conductors in both the
metal mode and wood mode.
When a “live” wire/conductor is detected, the
indicator
a appears in the display. Move the
multi-detector over the surface repeatedly in
order to locate the “live” wire/conductor more
precisely. After moving the multi-detector over
the surface several times, the “live”
wire/conductor can be located quite precisely.
If the multi-detector is very close to the
wire/conductor (four or five bars in indicator a),
the illuminated ring
1 flashes red and the
signal tone sounds with a rapid tone
sequence.
• “Live” wires/conductors can be detected
more-easily when power consumers (e.g.,
lamps, appliances) are connected to the
wire/conductor being sought and switched
on.
• Wires/conductors with 110 V, 240 V and
380 V (three-phase current) are detected
with about the same scan capacity.
• Under certain conditions (such as when
behind metal surfaces, shielded in conduit or
behind surfaces with high water content),
“live” wires/conductors cannot be detected
with certainty. These ranges may be
recognized in the metal detection mode as
metal objects.
• Wires that are not “live” might be detected as
metal objects with the metal-detection mode.
However, unlike solid copper cables,
stranded copper cables are not detectable.
• When “live” wiring is detected over a wide
area, the scan for “live” wiring is not reliable
because something in the surface material is
shielding or distorting the electrical field.
Before penetrating a
surface (such as with a
drill, router, saw or nail), always shut off
the electrical power, gas and water
supplies.
Cutting, drilling, etc… into these
items when operational can result in personal
injury.
Scanning for “Live” Wires
Detection Through Special Surface Materials
!
WARNING
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