Manipulator, vial stoppering

Manipulator. To test the residual moisture in a product in addition to the measurement of desorption rate, the freeze dryer could be equipped with a manipulator (Figure 31) and a vacuum lock, which permits one to take out the sample or to close marked vials with a stopper inside the chamber. 

When analytical instruments, e.g., analytical balances, are used in the course of manipulation of chemical carcinogens, the sample should be placed in tightly stoppered tubes or vials, so as to avoid contamination. If, by accident, analytical instruments become contaminated, they should not be used until they have been thoroughly decontaminated (see Section 3). 

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