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The biological autonomy of man when isolated from his original biosphere can be ensured only by Biological Life Support technologies. Among these, bioreactors are of prime importance and can be divided into two main groups: biomass producing bioreactors and materials transforming bioreactors. The latter case requires, if possible, high concentrations of active cells, in order to obtain a maximum efficiency in the transformation of substracts to products. One way to obtain such objectives is to immobilise the microorganisms. Specific and precise tools are required to control continuously the immobilised biomass. Among them there is a biomass monitor able to measure both free and immobilised biomass concentration. Such a monitor has been developed by Nuevas Tecnologías Espaciales (NTE) in collaboration with the Chemical Engineering Unit of the Universitat Autònoma de Barcelona (UAB) under the Technology Research Programme (TRP) of the European Space Agency (ESA).