WOLFF GmbH & Co. KG | D-74360 Ilsfeld | Ungerhalde 1 | Tel. +49 (0)7062-91556-0 | Fax +49 (0)7062-91556-10 | E-Mail [email protected] |
Internet www.wolff-tools.de
3. Turning the hydrometer on
Press the „ON” button to turn the device on. The hygrometer will start automatically, without calibration. When the
device turns on, the display will show the recently selected scale. If the battery level is too low, the device will display
the appropriate message, and then turn off.
4. Turning the hydrometer off
If the device is not used for a longer time, it shuts down automatically. This extends the life of the batteries.
To manually turn the device off, press and hold the “SELECT MATERIAL” button.
During every shut down, the recently used settings (scale, language, alarm thresholds) are saved.
5. Measurement
The device analyses the dielectric properties of the material by measuring the electric field emitted by a metal ball.
Dielectric properties depend on moisture content, bulk density of the material and metal elements.
CAUTION!
If metal
parts (i.e. nails, screws) are present within the measurement area, the results will be biased towards higher values.
The results of the measurement are displayed on the screen. The hygrometer has 9 scales than can be used to
determine the moisture content of the material. The selected scale is displayed at the bottom of the screen.
To perform a measurement, press the metal ball to the material and press and hold the
“ON” button!
CAUTION!
The angle between the hydrometer and the tested surface should be between 45° and 90°. When
the “ON” button is released, the hydrometer automatically switches to the “HOLD” mode.
1. Scale selection
The device is equipped with multiple scales, which eliminates the need to use adjustment tables. This makes
measurements not only more precise, but also easier and more convenient.
The selected scale is displayed at the bottom of the screen. To change the measurement scale, briefly press the
“SELECT MATERIAL” button.
CAUTION!
When the device turns on, the display will show the recently selected scale.
Table
1
. Names and descriptions of the measurement scales available in GM-200
Scale number
Scale name
Description
1.
Relative Scale
Basic scale. Shows the relative humidity of the material.
2.
Anhydrite Screed
wt%
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.
3.
Anhydrite Screed
CM%
This scale is used to measure the moisture content of Ascreed. The displayed value is an
approximate value that can be also determined using the Carbide Method (CM).
4.
Cement Screed wt% This scale is used to measure the moisture content of cement screed. The content of water is
expressed as a percentage of weight.
5.
Cement Screed 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).
6.
Concrete wt%
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 humidity measurement
methods.
7.
Gypsum Screed wt%
This scale is used to measure the moisture content of gypsum plaster. The content of water is
expressed as a percentage of weight.
8.
Hardwood wt%
This scale is used to measure the moisture content of Hardwood. The content of water is
expressed as a percentage of weight. This scale is used to measure the moisture content of
wood with a density of 0.6-0.9 [10
3
kg/m
3
] (i.e. oak).
9.
Softwood wt%
This scale is used to measure the moisture content of Softwood. The content of water is
expressed as a percentage of weight. This scale is used to measure the moisture content of
wood with a density of0.4-0.55 [10
3
kg/m
3
] (i.e. spruce). The content of water is expressed as a
percentage.
WARNING ; The CM-Scale in this measuring device does not replace the determination of residual
moisture with a CM-meter ( carbide method) in screed floors as prescribed in DIN 18365