Vortex flow sensor with a capacitive sensing element

Details Vortex flow sensor with a capacitive sensing element Vortex flow sensor with a capacitive sensing element

1997-10-17

1999-12-21

Patel, Harshad

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386124, G01F 132

Patent

active

060033843

ABSTRACT:
This vortex flow sensor is to be designed either as vortex sensor with a capacitive vortex sensing element (3, 3') either arranged in the hole of a bluff body (4) or inserted into a wall opening of a measuring tube (2, 2') downstream of the bluff body. Both vortex sensing elements being of largely identical construction and being capable of being produced as an independent component in the manner of a module. The wall sensor (3) and the bluff body sensor (3') has a diaphragm (33, 33') sealing off the hole and the wall opening. A flexurally stiff thin sensor vane (31) or sensor sleeve (51) and a sleeve-shaped electrode arrangement (34, 34') with at least one electrode (341, 341') are attached to the diaphragm on opposite sides. A housing cap (32, 32') surrounds the electrode arrangement and the diaphragm, is fixed on the measuring tube and contains a second electrode arrangement (35, 35') with at least one counter-electrode (351, 352; 351', 352'). The mass of the sensor sleeve is made equal to the mass of the electrode arrangement (34, 34'). The geometrical moment of inertia of the sensor sleeve is made equal to that of the electrode arrangement (34, 34'). The housing cap is dimensioned to be of sufficient flexural stiffness to ensure that it does not bend in the case of a maximum permissible acceleration acting on the measuring tube.

REFERENCES:
patent: 4716770 (1988-01-01), Herzog
patent: 5347873 (1994-09-01), Vander Heyden

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