H68.0.03.6C-02 Operating Manual GMI 15 plus page 6 of 12
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6 Measurement Basics
6.1 Measuring field & depth
The device measures with an electric field (capacitive measuring method), which propagates from
the rear side downwards. The measuring depth can be changed between approx. 10 mm and 25
mm with the sliding switch.
Side view: measuring field and penetration depth for “25 mm”
The specifications for the penetration 25 mm are just approximate values. The actual depth will be
the higher the wetter the measured material is. Therefore areas deeper than 25 mm will be
measured in very wet materials.
On the rear side the area is marked under that it is predominantly measured.
For precise measurements, the device has to lie on the measured material not only at
the marked measuring spot but at its whole rear side. If there is an air gap between
device and material the measured value will be too dry.
Here are some examples for measurements that are not precise at all. (Measured value too dry in
all cases):
6.2 Moisture rating (‘WET’ - ‘MEDIUM’ - ‘DRY’)
In addition to the measuring value there is a moisture rating via bar graph. For most applications,
the decision ‘wet or dry’ is easy and comfortable and has no longer be deduced from literature and
tables.
However, this rating can only be a first approximate value, because factors like the application field
of the measured material have to be taken into account for the final rating. This device cannot
completely replace the knowledge of an experienced craftsman or technical expert.
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