Process control instrument using a pneumatically driven resonant

Details Process control instrument using a pneumatically driven resonant Process control instrument using a pneumatically driven resonant

1982-02-26

1984-09-18

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Vibration type

73651, 73655, 73705, 250227, G01L 710, G01L 900

Patent

active

044716605

ABSTRACT:
A process control instrument, in which the resonant frequency of a vibrating string varies in accordance with changes in a process parameter being monitored, employs a pneumatic drive system to induce the string into oscillation. Pressurized gas is discharged through a port, such as a jet nozzle, which is disposed to allow the gas to impinge on the outer surface of the string. Variations in the alignment between the gas discharge port and the string permits different modes of vibration, one of which is particularly suitable for process measurement purposes. In a particular embodiment of the apparatus, an optical sensor detects the frequency of vibrations, resulting in an intrinsically safe instrument for use in explosive environments.

REFERENCES:
patent: 3503479 (1970-03-01), Canova
patent: 3505880 (1970-04-01), Riordan
patent: 3557660 (1971-01-01), Palmer
patent: 3581579 (1971-06-01), Schmidlin

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