Material hygrometer LB-796 is designed for absolute humidity measurement of wood, walls and other materials for which it was calibrated.There are two measurement methods available in the hygrometer.
The electrodes are attached permanently to the meter. The needle
electrodes are assigned for soft materials i.e. foamed polyester, clay,
cereals. They can have various lengths depending on the type of
material and user requirements. The flat electrodes are assigned for
hard materials i.e. wood, brick, concrete etc.
In case of the resistance method of humidity measurement it is performed using a resistance probe ended with the gripping devices. It is possible to disconnect the probe from the hygrometer.The main features of the hygrometer LB-796 are:
The hygrometer is calibrated in such way, so it indicates a mass
humidity, which is defined as a ratio of water content in a material to
a mass of absolutely dry material (in %). There is also a possibility
of scaling the meter, in such way, so it indicates otherwise defined
humidity or a material electric permittivity.
The measurement scope and measurement uncertainty for the materials
available in the meter are provided in an annex to an instruction
manual of a certain meter. The measurement resolution amount to
The measurement inaccuracy of wood humidity depends on many factors such as i.e. wood flaws in a spot of taking a measurement, uneven distribution of humidity in wood, improper way of taking a measurement. The influence of those factors (each treated separately) is not big and should not provide any meaningful reflection on a measurement result. However, when few on them appear simultaneously and in their unfavorable accumulation they can lead to serious measurement errors. When taking a measurement one should follow all comments and indications described in the appropriate chapters of the device user manual.Wood humidity can be divided to two characteristic scopes:
The upper scope of hygroscopic humidity 30% is conventional and for various types of wood assumes value 23% do 33%.
|Meteorological parameters for
|scope||-10...70 °C||-0...50 °C|
||+/- 0,5 °C||+/- 0,5 °C|
||1 battery 9V type 6F22
||4 mA - temperature measurement
6 mA - resistance method
38 mA - capacity method
|SCOPE OF WORK TEMPERATURES
|Meter LB-796||0..+50 °C||Water outdropping is unacceptable