Method for a pressure-based determining of a product parameter in a freeze dryer, freeze dryer and software product
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United States of America
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Apr 20, 2021
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Apr 25, 2019
app pub date -
Oct 17, 2018
filing date -
Oct 17, 2018
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Abstract
Methods are disclosed for the pressure-based determining of a product parameter in a freeze dryer, in particular a product temperature. At a point in time tSTART, a closing element as an intermediate valve between an ice chamber and a drying chamber of the freeze dryer is closed. Then, during a pressure rise occurring due to the sublimation pressure values (P1, P2, . . . ) are measured in the drying chamber. At a point in time tEND then the closing element is opened. From the measured pressure values (P1, P2, . . . ) an approximation of a product parameter, in particular a product temperature TAPPROX, is determined. The point in time tEND is determined specifically for the measured pressure values (P1, P2, . . . ) such that the time span for which the closing element is closed depends on the determined pressure values and such that the time span is variable during a drying process.
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