| 摘要 |
PCT No. PCT/DK94/00308 Sec. 371 Date Feb. 27, 1996 Sec. 102(e) Date Feb. 27, 1996 PCT Filed Aug. 17, 1994 PCT Pub. No. WO95/05579 PCT Pub. Date Feb. 23, 1995A measuring section for an electromagnetic flowmeter is provided having a metallic measuring tube made of a non-magnetic material, a set of magnetic coils for generating a magnetic field in a direction substantially at fight angles to the direction of flow, an electrode arrangement which is arranged substantially at fight angles to the direction of the magnetic field and substantially at right angles to the direction of flow, and an electrical insulator on the inside of the measuring tube, and also a method for the manufacture of this measuring section. Here, it is desirable for manufacture to be carried out with a relatively high degree of reliability. For that purpose, the insulator is constituted by a surface layer of metal oxide or metal nitride having a thickness of more than 10 mu m an on the inside of the measuring tube. The inside of the measuring tube can be oxidized or nitrogenized for that purpose and a metal oxide or a metal nitride is deposited on the resulting oxide or nitride layer.
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