Checkline LM6 - Manual (Page 5)

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3.0 DETERMINATION OF THE REFERENCE WATER CONTENT
The humimeter LM6 determines the water content, which means that it calculates the
moisture referred to the total mass (DIN53304):
3.1 Short description of norm DIN53304
Take a leather piece according to DIN 53302 T2 or DIN 53303 T2. For the
determination of the water content, weigh the leather piece with an accuracy of 0,001
g (mass Mn). Put the piece of leather in a glass bowl that was dried at (102 ± 2) °C
and was weighed after cooling to room temperature. Dry the opened glass bowl in a
drying chamber at (102 ±2) °C for 5 hours. After closing the glass bowl cool it in an
exsiccator. Now determine the mass (Mt). After that, go on with the above described
drying procedure in the drying chamber for one further hour, cool and weigh again. If
the weight after the second drying period decreases less than 0.1 % of the initial weight,
the assay is finished. If the decrease of weight is higher than 0.1 %, the drying has to be
continued. The total period of drying must not exceed 8 hours.
100 %
×
−
=
Mn
Mt Mn
WG
Mn: Mass with average moisture content
Mt: Mass of the dried sample
%WG: Calculated water content