15. SAMPLES PREPARATION
This section of user manual contains information about obtaining optimum test results during
drying process. There are hints for selection of appropriate drying parameters for various
materials and substances.
15.1. Moisture Content Measurement Principle for Moisture Analyzer
Measurement of sample moisture content is carried out by determining the loss of sample
mass during heating (evaporation).
MAX2 moisture analyzer is comprised of two elements: a precision balance and a drying
chamber. Compared to standard moisture content determining methods, the measurement
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 tested
substances.
Optimum temperature and drying time depend on sample type and size, and anticipated
measuring accuracy. Selection of drying parameters can only be carried out on basis of test
measurements.
15.2. Sampling and Preparation
Sample features, its preparation and size 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.
Final measurement result is vastly conditioned by precise and considered sample
preparation. A sample used for analysis has to represent the total structure of tested
material. Sampling process should determine: sampling means, sample disintegrating,
particle size after disintegration, sample uniformity and other. The sampling process has to
be carried out as quickly as possible, so that a sample does not lose or absorb moisture from
surrounding area.
Applied sampling standards should match individual operator needs and requirements of
tested material, its consistence and sample size.
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