Abstract: In a flow measuring device having a measuring tube with a sensor arrangement and an evaluation unit for ascertaining a flow, a sensor arranged on or in a measuring tube having a tube wall of a metal support material and a first ply of a corrosion resistant material that protects the metal support material from corrosive measured media and is placed on an inner surface of the tube wall; or a tube wall of a corrosion resistant material, wherein in the measuring tube on the side of the first ply facing the medium or on the side of the measuring tube wall of the corrosion resistant, synthetic material facing the medium a ply or second ply is arranged for reducing mechanical loading, of the synthetic material by the measured medium, wherein the ply or second ply has a greater hardness than the first ply or the tube wall.

Abstract: In a flow measuring device having a measuring tube with a sensor arrangement and an evaluation unit for ascertaining a flow, a sensor arranged on or in a measuring tube having a tube wall of a metal support material and a first ply of a corrosion resistant material ply that protects the metal support material from corrosive measured media and is placed on an inner surface of the tube wall; or a tube wall of a corrosion resistant material, wherein in the measuring tube on the side of the first ply facing the medium or on the side of the measuring tube wall of the corrosion resistant, synthetic material facing the medium a ply or second ply is arranged for reducing mechanical loading, of the synthetic material by the measured medium, wherein the ply or second ply has a greater hardness than the first ply or the tube wall.

Abstract: The electrode assembly (3, 3′, 3″) avoids the reduction of the insulation resistance of electrodes (4, 4′, 41″) by a suitable design. The assembly is part of an electromagnetic flow sensor comprising a tube (1, 1′, 1″) made of a metallic, nonferromagnetic material. The tube has an insulating liner (2, 2′, 2″); an external surface (11) of the tube is untreated. Each electrode (4, 4′, 4″) has a head (41, 41′, 41″) and a shank (42, 42′, 42″) provided with a thread (43) and having a smaller diameter than the head. The electrode is fitted in hole (12) of the tube wall by means of an insulating body (5, 5′, 5″). The body has a disk-shaped portion (51, 51′, 51″) and a tubular extension (52, 52′, 52″) fitting the hole. A cylindrical part (6, 6′, 6″) is made of an insulating, hydrophobic material and has a bottom (61) and a wall portion (62).

Abstract: The sealing device has a sealing element which can be moved axially relative to the column by means of a positioning ring. A threaded bushing and a threaded ring that is screwed into it enclose the positioning ring. By means of these, the sealing element on the one hand is held at the column and, on the other hand, can be moved by turning the positioning ring. Thus, the connection points of the finished column can be matched to an existing line system.