Trotec T500 Manuel D'utilisation page 45

The temperature conditions must therefore be checked be-
fore the actual measurement procedure. To this end, the sur-
face temperature of the type of wood is measured, for example
with a pyrometer, and compared to the wood temperature set in
the device (see chapter 7, "TEMP" function). If both temperatures
are identical, the measurement can proceed.
Procedural instructions for the measurement
of moisture in building materials
The electrical conductivity of a dry, mineral building material
(e.g. cement screed) is very low. If the building material absorbs
water, the conductivity can increase rapidly, i.e. its resistance can
decrease.
In evaluating the results of the measurement, it must be taken
into account that the results are influenced by the composition
of the material being measured. The presence of soluble salts can
falsify the result of the measurement significantly. The more salts
are present, the higher the displayed measured value will be.
A further influencing factor for the evaluation of the results is the con-
nection of the electrodes with the building material.
For mineral, porous building materials, comparatively high transi-
tion resistances can occur due to low electrode contact (coupling),
which falsify the results of the measurement.
Both of the points mentioned are responsible for the accuracy of the
Operating manual – English
B - 12