6
EN
moisture indicator BM31
Calibrating the measuring device
Info
The first measurement after switch-on is carried out
automatically and serves for the purpose of calibration.
1. Hold the measuring device preferably somewhere near the
bottom and in one hand (corrugated rubber coating).
2. Point the measuring device away from the body and any
objects into clear space.
ð
CAL
flashes on the display for approx. 5 seconds.
ð
The calibration is complete once the
CAL
indication
stops flashing.
ð
The device is ready for operation.
Carrying out a measurement
1. Place the measuring device in a vertical position on the
component.
2. Press and hold the
MEAS
button (6) until the desired
measurement interval is completed.
3. Release the
MEAS
button (6).
ð
The indication HOLD (10) appears on the display.
ð
The last measured value is displayed in the
measurement value indication (13).
Performing a humidity scan
1. Place the measuring device in a vertical position on the
component.
2. Run the device over the surface to be measured without a
break. In doing so, press and hold the
MEAS
button (6).
3. Observe the indicated measured value for changes.
4. Release the
MEAS
button (6).
ð
The indication HOLD (10) appears on the display.
ð
The last measured value is displayed in the
measurement value indication (13).
MAX/MIN function
1. Press the
MAX/MIN
button (7)
before
performing the
measurement.
ð
The MAX indication (9) appears on the display.
ð
The highest measured value during a measurement will
be displayed.
2. Press the
MAX / MIN
button (7) again
before
performing
the measurement.
ð
The MIN indication (10) appears on the display.
ð
The lowest measured value during a measurement will
be displayed.
3. Carry out the measurement with the desired setting.
Switching on the display illumination
1. Press the Lamp button (5).
ð
The background illumination is activated.
2. Press the Lamp button (5) again.
ð
The background illumination is deactivated.
Switching the device off
Info
The device automatically switches off after
approx. 30 seconds of non-use.
Please proceed as follows for manual switch-off:
1. Press the on/off switch (8).
ð
The device is switched off.
Dielectric measurements
The measuring device at hand serves for the rough
determination of the material or wood moisture content
according to the dielectric measuring principle. Fields of
application include the non-destructive moisture measurement
of sawn timber, lumber and firewood as well as of mineral
building materials.
The dielectric measuring method is an indirect measurement
method, since the moisture content of the measured material is
deduced from the changed dielectric permittivity.
General notes on use
If precise material moisture values are required, an additional
control measurement applying the Darr procedure is
recommended. Especially for precise wood moisture
measurements for other wood temperatures or with due regard
to the type and bulk density of a certain timber it is
recommended to use a wood moisture measuring device with
temperature comparison function and selection option for the
specific wood type calibration.
•
The measurement results are only to be used as reference
for a rough orientation.
•
The displayed measured values are so-called unitless digit
values in the range of 0-100. These do not resemble
moisture data in mass % or volume %.
•
The height of the measured value can be calculated from
the determined dielectric constant of the measured
material. Dry air has a constant of 1, water 80. Hence, the
more humidity is contained in the material, the higher will
be the displayed measured value.
•
Another important variable influencing the measured value
is the bulk density of the good to be measured. The higher
the bulk density, the higher the measured value.
