Fluid metering

Details Fluid metering Fluid metering

1988-08-11

1991-09-17

Williams, Hezron E.

Measuring and testing

Specific gravity or density of liquid or solid

7386102, G01N 924

Patent

active

050483234

ABSTRACT:
A gas flow correction sensor for producing an output signal proportional to the ratio between line pressure and line temperature for gas flowing in a line, for use in correcting the output of a volumetric flow meter connected in the line, comprises a sealed chamber containing a fixed mass of a reference gas. The sealed chamber includes a bellows portion subjected to line pressure, thus maintaining the reference gas at line pressure. Additionally, the sealed chamber is thermally insulated and includes at least a portion disposed in a thermowell immersed in the line, so as to maintain the reference gas at line temperature. A vibrating quartz density sensor is also mounted in the thermowell, so as to produce an output signal whose frequency is proportional to the density of the reference gas, which can be shown also to be proportional to the desired line pressure to line temperature ratio.

REFERENCES:
patent: 4297872 (1981-11-01), Ikeda et al.
patent: 4526480 (1985-07-01), Ward

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