Method and apparatus for calibrating a differential pressure tra

Details Method and apparatus for calibrating a differential pressure tra Method and apparatus for calibrating a differential pressure tra

1987-12-22

1988-10-11

Levy, Stewart J.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01L 2700

Patent

active

047762012

ABSTRACT:
A low range differential pressure transducer is connected in a closed fluid system which also contains a U-tube filled with oil in its upper portion and mercury in its lower portion. Under conditions of high line pressure similar quantities of oil are displaced within the closed system from one arm of the U-tube to the other, causing the mercury in the latter arm to be forced down while rising in the other arm. The difference in height between the levels of mercury is used in calculating the differential pressure. By connecting a number of U-tubes in series the cumulative differences between the levels of mercury in the arms of each U-tube can be used in calculating the differential pressure for a transducer designed to measure differential pressure over a wider range of low pressures.

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patent: 4489786 (1984-12-01), Beck
patent: 4499751 (1985-02-01), Riggs

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