KERN DLB 160-3A Operating Instructions Manual

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KERN DLB 160-3A Operating Instructions Manual Manual pdf 50 page image

50 DLB_A-BA-e-111012.4 Preparing a samplePrepare one sample at a time for measuring. This prevents the sample fromexchanging moisture with its surroundings. If several samples have to be taken at thesame time, they should be packed in airtight boxes so that they do not undergochanges during storage.To receive reproducible results, spread the sample thinly and evenly on a sample dish.Patchy spreads will produce inhomogeneous heat distribution in the sample to be driedresulting in incomplete drying and increased measuring time. Sample clusters generateincreased heating of the upper layers resulting in combustion or incrustation. The highlayer thickness or possibly arising incrustation makes it impossible for the moisture toescape from the sample. Due to this residual moisture, measured results calculated inthis way will not be comprehensible or reproducible.Preparing a sample from solids:• Spread powdery or grainy samples evenly on the sample dish.• Grind coarse samples using a mortar or a shredder. When grinding the sample avoidany heat supply as this may cause loss of humidity.Preparing a sample from liquids:For liquids, pastes or melting samples we recommend to use a glass fibre filter. The glassfibre filter has the following advantages:• Even distribution thanks to capillary attraction• no formation of droplets• fast evaporation due to a greater surface