H68.0.03.6C-01
Operating Manual GMK 100
page 8 of 12
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7
Wood Measuring
Best results are obtained if you measure
crossways to the wood’s grain. (see right picture)
Unplaned and wrinkled surfaces are causing too low measuring results!
NOTE:
Wood is a natural product. Its density fluctuates due to the tree’s
growth and flaws (knots, cracks, resin pockets, etc.). This may lead
to measuring errors up to several %u, because the measurement
depends on density.
If your kind of wood is not listed in addendum A, it can be measured, but an
increased measurement error must be expected.
8
Floor screed Measurement
NOTE:
Floor screed dries patchy and therefore areas may be differently wet. A big amount of
water has to be released upwards (evaporate) before you can tile it. The floor screed has
to be drier if a vapor-tight covering should be used as if it would be with a diffusion
permeable covering. Therefore the moisture rating of the device can only be a first
approximate value and the decision whether the floor is ready for further covering or not
cannot be based only on this rating.
Reinforcements (iron) or floor heating near the surface may cause erroneous measuring
results. Please consider chapter 10.2 CM-moisture.
9
Measurement of Other Materials
Should other material than screed or wood be measured, you can do significant
relative
measurements
.
We recommend the material
“rEF” (dimensionless digit-value) for this purpose.
For example if you want to evaluate water damage you can measure surely dry spot and an
evidently wet one (identifiable by salt efflorescence, water spots, mould growth, etc.). Then you can
compare the other measuring values with them and get the moisture distribution of your measuring
area or find the reason for the moisture penetration.
You do not need absolute values (%u) for this.
NOTE:
Please consider that the configuration of the measured wall (cavity block, cement joints,
reinforcements, etc.) may also influences the measuring values.
