Freeze Drying

Freeze drying is a method for carefully extracting moisture from products like food or serums. Such products are sensitive to temperature and care has to be taken in order to protect their internal structure. Freezing is followed by an accurately controlled pressure decrease, which leads to sublimation of the microscopic ice crystals.

Challenge

Losses of expensive product lots must be avoided and process run at reasonable cost. This is why the demands on the required vacuum gauges regarding repeatability and reliability are extremely high.

Solution

The VCP Pirani vacuum transducer has a helix platinum rhodium filament. This new sensor version is not only suitable for corrosive gas applications in the range of 100 ... 5e-4 hPa. The relatively smooth surface of the material reduces coatings due to oil vapor or other contamination and ensures an especially long live time of the filament. This was proofen in field tests in especially critical applications. The sensor can even resist steam sterilization. Its metal sealed sensor with long-life helix filament and the stainless steel flange make the gauge especially robust The results are an improved reliability of the process and a decrease of maintenance costs.

One of the world´s leading companies in the field of development and production of freeze dryers has trusted in the quality and precision of our vacuum sensors for many years.