FREEZE-DRYER, SOFTWARE PRODUCT AND METHOD FOR PRESSURE-BASED DETERMINATION OF A PRODUCT PARAMETER IN A FREEZE-DRYER.

摘要

The invention relates to a method for the pressure-based determination of a product parameter, in particular a product temperature, in a freeze dryer. In such a method, at a time t START, a shutter member such as an intermediate valve is closed between an ice chamber and a drying chamber of the freeze dryer. There then takes place a measurement of pressure values (P 1, P 2,...) In the drying chamber during the pressure rise occurring as a result of the sublimation. At a time t END then the opening of the closure element takes place. From the measured pressure values (P 1, P 2,...), An approximation of a product parameter, in particular a product temperature T APPROX, is determined. According to the invention, the time t ENDE is determined specifically for the recorded pressure values (P 1, P 2,...), So that the time span for which the closure element is closed and the pressure rise takes place depends on the determined pressure values and becomes variable during a drying process is. By means of the method according to the invention, in particular an undesired thawing of the drying product can be avoided.