| http://www.w3.org/ns/prov#value | - The inspection window may be of any suitable transparent material, such as plastics, Perspex, glass or the like, and may be characterized therein that it can withstand a pressure of at least between 40 and 50 bar. [0018] The monitoring unit may include regulating means for regulating flow across the membrane, as well as fluid pressure in the unit.
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