PLANT PRODUCTION & SOFTWARE
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Moisture meters are essential tools
for avoiding wood problems such
as shrinking, warping and cupping.
Both both pin and pinless meters
have advantages and disadvantages.
Pinless meters use electromagnetic
wave technology, which measures
the density in a 3-D field underneath
the measuring pad and indicates
the average. The distortion of the
electromagnetic wave caused by the
material being scanned is what the
meter uses to measure moisture.
While both types of meters must
take into account the wood species,
the wood’s temperature does not
affect the measurements in pinless
meters. Another advantage for pin-
less meters is that a large number of
boards can be scanned in a short
time and the measurements leave
no visible marks, i.e., no pinholes.
However, pinless meters require
a somewhat flat and smooth surface.
They also give general indications
of moisture location in wood rather
than specific, and if the wood being
scanned is too thin, you could get
moisture content readings for objects
behind the wood.
Pin meters measure the electrical
If the lumber is hot or cold the
resistance between two pins. The
electrical resistance changes with
the moisture content of wood — if
moisture varies within the small seg-
ment of the non-insulated part of the
pins, the highest value is indicated.
electrical resistance in the wood
changes; so, temperature correc-
tions are necessary.
For general usage, pin meters
are more versatile and can be used
to measure round, small and oddly
Sources: Lignomat USA, Lignomat.com
or 800-227-2105. Delmhorst Instrument Co.,
Delmhorst.com or 877-335-6467.
Metering moisture in the product