Radwag MAX 60 Moisture Analyzer Manual de usuario descargar pdf (Pagina 76)

- 76 -

13.6. Drying mode analysis

In the first case the drying mode is an asymptote. The humidity content in a

sample reaches a constant and it does not change after long drying time.

Using this drying mode enables easy obtaining of repeatable humidity content

in a tested sample.

The measurement result refers specifically to the constant asymptote value. It

easily corresponds and it is simple to determine appropriate finish mode

criterion.

The other type of drying mode in its initial stage is carried out rapidly, and later

on it slows down. Humidity content never reaches a constant value. The drying

mode in this case may form in the following way:

The sample demonstrates thermal decomposition. The decomposing is sample

(product) evaporation, and the sample losses weight. The fat, oil, plastics and

other volatile ingredients may cause slower evaporation process than in case

of water. The ingredients that evaporate hard cause decreasing of sample

mass.

The measurement result using this drying mode can be optimistic:

• Decreasing temperature may slow down ingredients’ reaction.

• Selecting an appropriate finish mode criterion may enable detecting an

end of the analysis in the described drying point.

• Selecting a constant drying process often ensures very good results.

• Permanent maintaining initial mass of a sample to be tested

(+10%....+20%).

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 87 88

Sin comentarios

Radwag MAX 60 Moisture Analyzer Manual de usuario Pagina 76