12. SAMPLE PREPARATION FOR A DRYING PROCESS
This section of the user manual presents data on obtaining optimum measurement
results from drying a sample to be tested. It lists the principles of selecting drying
parameters in relation to a material to be tested.
12.1. Principles of humidity content determination in a moisture analyzer
Measurement of moisture content in a tested sample is carried out by
determining loss of mass in a sample by its heating (humidity evaporation from a
sample).
RADWAG moisture analyzer comprises two components: a precision balance
and a drying chamber. Compared to standard moisture content determining
methods, the measurements with application of RADWAG moisture analyzer is
much quicker and does not require additional mathematical calculations (a result of
moisture content is previewed on an ongoing basis during product testing process).
Independently on moisture content determining method, the measurement
accuracy is highly influenced by means of sample preparation and selection of
testing parameters, such as:
• Sample size
• Sample type
• Drying temperature
• Drying time
In practice, the measurement accuracy is not as important as the speed of
obtaining measurement result (control over technological process). Thus, heating a
sample (with application of a halogen filament) carried out by a moisture analyzer,
makes the measurement process very time efficient and short. Measurement speed
can be additionally increased by appropriate adjusting moisture analyzer’s
parameters depending on substances to be tested.
Optimum temperature and drying time depend on type and size of a sample
to be tested, and anticipated measuring accuracy. Selection of drying parameters
can only be carried out on basis of test measurements.
12.2. Sampling and preparation
Features, preparation and size of a sample are very important factors
influencing the speed and accuracy of measurement process.
Means of sampling and preparation are extremely important for repeatability
of measurement results, as a sample should be a representative part of tested
substance.
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