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1. DECRIPTION AND APPLICATIONS
Wood Moisture Meter WRD-100 is a sophisticated electronic
device for measuring moisture in wood from 6% to 100% of
moisture contents. It can measure moisture in 11 different
types of wood: pine, spruce, fir, great maple, birch, maple,
ash, walnut, oak, beech and poplar. The Moisture Meter is
equipped with temperature compensation control knob. The
Moisture Meter is also equipped with a hand and a Hammer
Electrode and in addition it can be equipped with an Inertial
Electrode EB-1
Moisture Meter WRD-100 is widely used in wood industry,
forestry and other industries utilising wood.
2. TECHNICAL DATA
Range
6 % - 100 % moisture contents
Number of wood types
11
Wood temp. range
0° - 50° C
Display type
LCD
Power
1 * 9V (1 battery 6F22)
Battery life
about 10.000 measurements
Size
instrument
33 * 80 * 165 mm
case
80 * 180 * 250 mm
Electrodes
hand
2*6 mm
hammer
4*12 mm
or
2*8 mm
Weight
1.4 kG
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3. PREPARING THE INSTRUMENT
- Before the measurement you should connect the moisture
meter with one of the electrodes. with coaxial cable
provided.
- Set the "WOOD TYPE" switch to the appropriate wood
type and the "WOOD TEMPERATURE" switch to the
measured (or approximate) wood temperature.
4. SELECTING THE ELECTRODE
-
We recommend that the length of the needles you use
should be about 25-30 % of the thickness of the timber.
- To measure wood with a high moisture contents you
should use the hammer electrode with long needles. A dry
wood should be measured with the hand electrode (or the
hammer electrode with short needles).
5. MEASUREMENT
To conduct measurements do the following:
- Beat the electrode into the wood. A line drawn between
the needles should be perpendicular to the fibres in the
wood.
- Press the power switch.
-
Read the result on the LCD.
If the moisture contents is lower than 6% a sign „LO” appears
on the LCD, if the moisture contents is higher than 99.9% -
„HI” is displayed.
While conducting the measurements you should observe the
following rules:
- Do the measurement in the middle of the timber not closer
than 0.5 m from each end.
- Do not make the measurements where there are defects in
the wood.
- You should make from 2 to 4 measurements on each side
of the timber.
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- In each spot you should make not less than 3 separate
measurements 10 - 15 mm apart.
- The final result is the arithmetic average of the results.
6. MEASURING VERY DRY WOOD
Measurements of moisture contents in a very dry wood
(below 10%) are subject to interference. This can be observed
when the result of the measurement becomes unstable. The
sources of the interference are electrostatic charges and
electromagnetic fields. Often the measurements of very dry
wood are conducted in a very dry environment (below 30%
RH) and this additionally increases the problem.
When measuring a very dry wood:
- do the measurements in a place where the electro-
magnetic interference is minimal (away from electric
engines, high voltage wires etc.),
-
do not walk around the device,
-
use thin needles because they provide a better contact
with the wood,
- in extremely difficult conditions place the timber on a
grounded metal plate or wire mesh.
7. CHANGING THE BATTERIES AND STORAGE
The instrument is equipped with a power level control unit.
When the power drops below acceptable level a sign "LO
BAT" appears on the left side of the LCD. This indicates that
the battery has expired and should be replaced with a new
one.
To replace the battery unscrew the screw on the back of the
instrument and carefully remove the back panel.
Store the device in a dry place.
8. ADDITIONAL INFORMATION.
(a) The most common cause of bending or breaking the
needles in the hammer electrode is an incorrect way of
pulling it out of the wood. With long needles and hard
