OHAUS MB27 Guide De L'utilisateur page 8

EN-6
Types of Samples
Pasty, fat containing and melting substances
Use a glass fiber filter to increase the surface area of these types of samples (e.g., butter). The moisture in these
substances is more uniformly distributed through the filter. The increased surface area results in faster and more complete
vaporization of the moisture.
Liquid substances
Liquids (e.g., dispersions) tend to form drops on the test pan, which prevents rapid drying. Use of a glass fiber filter
shortens the drying time significantly as the filter distributes the liquid sample over a larger surface area.
Skin-forming and temperature sensitive substances
Formation of a film on the surface of these samples can prevent complete determination of moisture. Using a glass fiber
filter to cover the sample allow gentler and more beneficial heating, improving reproducitility.
Sugar-containing substances
Samples containing large amounts of sugar tend to caramelize. Ensure that a thin and uniform layer is applied and a
moderate temperature selected. The sample can also be covered with a glass fiber filter that improves reproducitility.
The following substances present risk of fire, explosion, damage or injury.
Should there be any uncertainty regarding the safety of a substance, always perform a careful risk
analysis. In such cases, never leave the Analyzer unattended.
Volatile substances
With volatile samples, rapid application of the sample on the test pan is advisable, to limit the moisture from escaping
before the initial weight is recorded. These substances also include samples treated with solvents, and substances which
contain solvents or release flammable or explosive vapors. Work at drying temperatures low enough to prevent the
formation of flames or an explosion. Always work with small samples (maximum 1g).
Poisonous and toxic substances
Substances which contain toxic or caustic components should only be dried in a fume hood.
Corrosive substances
Substances which release corrosive vapors when heated (e.g. acids) should be tested in small amounts. The vapors can
condense on the Analyzer parts causing corrosion.
MB27