WOLFF VI-D4 Basic Handbuch Seite 10

It is recommended to repeat the measurement in a few points situated next to each other as
humidity has a tendency of uneven distribution. If the measurements vary, only the highest
outcomes should be used.
• To switch off the meter press ON/HOLD button for around 2 seconds.
3. Preparation of the surface before measuring
All concrete heating/drying equipment should be switched off at least 96 hours before taking the
final measurements. Otherwise the outcome may not reflect the actual humidity level or
displacement of humidity in tested material. Before the measurement may be taken, the analyzed
surface should be cleaned- there should not be any foreign substances like plastic films, dust etc..
In case of measuring concrete floors all covering materials like: concrete additives, primers, paints,
etc., should be removed in order to reveal pure concrete that is going to be measured.
All cleaning and cover-removing works should be finished at least 48 hours before taking the
measurement. VI-D4 meter should not be used to measure concrete on which there is water in a
liquid state. Measurements should be avoided in areas exposed to direct sunlight or other sources of
heat.
4. Available scales
1. Concrete 0-6% H2O Concrete scale may be used only for concrete surfaces. It shows the
relation between weight of pure water contained in the tested material with its dry weight. The
scale range varies between 0 and 6% as 6% is about maximal physically possible content of water
in the concrete. The obtained results should not be confused with moisture emission or any other
humiditymeasurement methods.
2. Cement Screed (0-6%H2O) This scale is used to measure the moisture content of cement
screed. The content of water is expressed as a percentage of weight.
3. Cement Screed (0-4% CM) This scale is used to measure the moisture content of cement
screed. The displayed value is an approximate value that can be also determined using the Carbide
Method (CM).
4. Anhydrite Screed (0-3.5% H2O) This scale is meant for moisture measurements in anhydrite
floors. The displayed value is an approximation of a value that normally would be indicated using a
CM-measurement device.
Wolff GmbH & Co KG | D-74360 Ilsfeld | Ungerhalde 1 | Fon: +49 (0)7062-91556-0 | Fax: +49 (0)7062-91556-41 |
www.wolff-tools.de