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AssigneeDanfoss A/S
InventorsHenning Max Hansen, Hans J.o slashed.rgen Pedersen, Frands Wulff Voss, Niels Gade
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A 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.
An isolated liner for an electromagnetic flowmeter 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 right angles to the direction of flow, an electrode arrangement which is arranged substantially at right angles to the direction of the magnetic field and substantially at right angles to the direction of flow, and an electrical insulator located on an inner surface of the measuring tube, said insulator being constituted by a surface layer of metal oxide or metal nitride having a thickness of more than 10 .mu.m on the inner surface of the measuring tube.
A method for producing an isolated liner for an electromagnetic flowmeter 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 right angles to the direction of flow, an electrode arrangement which is arranged substantially at right angles to the direction of the magnetic field and substantially at right angles to the direction of flow, in which an insulator is arranged on an inner surface of the measuring tube, and in which the inner surface of the measuring tube is oxidized or nitrogenized and a metal oxide or a metal nitride is deposited on the resulting oxide or nitride layer.
Dependencies are inferred from the claim text.