In a device for carrying out mechanical, chemical and/or thermal processes in an educt in a housing (3) having working elements (5), such as kneading, mixing, transporting and cleaning elements, on at least one shaft (1, 2), wherein the housing (3) consists of at least two housing shells which form between them an upper and/or a lower saddle (19.1, 19.2), a sensor (20) is intended to be located in at least one saddle (19.2), which sensor detects changes in parameters, particularly pressure and/or temperature, in the region of the saddle (19.2).
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