Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1991-04-08
1992-04-21
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
73714, G01F 2314
Patent
active
051056623
ABSTRACT:
A system for measuring level of liquid material in a containment vessel that includes a hollow conduit composed of a first conduit section having an upper end coupled to a pressure sensor and a lower end disposed within the vessel. A second conduit section is coupled to the lower end of the first conduit section and extends downwardly therefrom at least to a minimum material measurement level within the vessel. The second conduit section has a vertical height coordinated with the maximum desired material measurement level within the vessel such that pressure of air captured within the first conduit section at such maximum material level prevents entry of the liquid material into the first conduit section. The cross sectional area of air flow within the second conduit section is at least ten times, and preferably at least sixteen times, greater than the cross sectional area to air flow within the first conduit section. Thus, the volume of air captured within the air column formed by the first and second conduit sections is minimized, thereby minimizing the effects of temperature-induced fluctuations of column air pressure. On the other hand, liquid level within the air column remains at all times within the conduit section of larger diameter, thereby reducing the likelihood of clogging of the small-diameter conduit section due to sediments or the like carried by the liquid.
REFERENCES:
patent: 2121743 (1938-06-01), Oyen
patent: 3221551 (1965-12-01), Hogan et al.
patent: 3283092 (1966-11-01), Grostick
patent: 3693738 (1972-09-01), Andrews
patent: 3777698 (1973-12-01), Hunter
patent: 3986398 (1976-10-01), Laymance
patent: 4567761 (1986-02-01), Fajeau
Marsh Norman F.
Regentin Randall J.
Bindicator Company
Yasich Daniel M.
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