To obtain a representative cross-sectional sample.
Check the cleanliness of the equipment, then gently penetrate the probe to the heart of the product whilst rotating the driver clockwise : the powder will enter the sample bag. Samples taken in this way are therefore representative of the different layers crossed by the probe. After sampling, purge the probe by reversing the direction of rotation. Withdraw the screw mechanism and clean with compressed air or a brush. When necessary sterilise the boring tube and screw in an autoclave.
NB : powder particles should not exceed 1mm in diameter.
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