Mammalian cell culture processes are very important in the production of recombinant proteins such as vaccines, antibodies, and pharmaceuticals for clinical applications. The physiology of mammalian cells is highly sensitive, leading to the need for sophisticated process technologies. A reliable sensor set-up is required to control major process parameters such as pH, dissolved oxygen, carbon dioxide, cell density, and feed rates. If such set points are not controlled tightly, then product quality and quantity might be altered. In addition, a steady cell-concentration measurement is necessary to plan feeding strategies.

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