Notes on Use
26
Hydromette BL Compact
4.3
Notes on Building Moisture Measurements
4.3.1
Introduction
The Hydromette BL Compact works by the well-known principle of
electrical resistance or conductivity measurement. This method is
based on the fact that electrical resistance is closely related to the
respective material moisture content. The conductivity of oven-
dried material is very low and the resistance so great that
practically no current can flow. The more water present, the more
conductive is the material and the lower the electrical resistance.
In order to achieve high-quality measurement results the material
should be measured at several points. The electrode pins must be
pressed well home. Both electrode pins should generally only be
pressed into the same piece of material.
It is not possible to measure material that is frozen or has a wet
surface.
When originally delivered the instrument includes 10 x 20 mm long
electrode pins. They are suitable for measuring to depths of up to
15 mm maximum.
Care must be taken that the knurled screws are always sufficiently
tightened to prevent measuring errors and the area between the
pins is kept clean.
Caution:
We do not recommend pressing the electrode pins into hard
building materials (screed, concrete, etc.), as this may produce
considerable measurement differences (a value that is too low/dry
is displayed). The electrode tip contact to the material is
problematic here.
