Cryogenic liquid level measuring apparatus and probe therefor

Details Cryogenic liquid level measuring apparatus and probe therefor Cryogenic liquid level measuring apparatus and probe therefor

1975-09-22

1977-05-03

Myracle, Jerry W.

Measuring and testing

Liquid level or depth gauge

Hydrostatic pressure type

G01L 700

Patent

active

040206904

ABSTRACT:
Liquid level in a vessel of cryogenic liquid or solid-liquid slurry is determined and indicated by sensing, in an immersed tubular probe, a probe-evoked vapor gas pressure counter balancing the hydrostatic head to the probe tip, and displaying an output on an appropriate meter scale or by a digital readout device in level height or other vessel-content terms, and, if desired, activating a low level alarm; the probe as a heat pipe conducting heat, from a source external of the liquid, to the probe bore as far as the tip to volatilize liquid entering the probe tip from which as a sensing gas the gas phase may slowly bubble; a differential pressure sensing device being connected to the probe and to the vessel gas space for a closed vessel.
The probe comprises a small-diameter copper sensing tube with bottom tip open to the liquid and top end connected to the pressure sensing device; and a sensing-tube-surrounding stainless steel tube as (at least at temperature of use) an insulating vacuum jacket, with certain structural expedients to accommodate differences in average thermal coefficients of linear expansion of the metals, to maintain the tubes generally coaxially spaced from contact under conditions, and to reduce heat transfer therebetween. Probe variations are given for use in the common method whereby liquid at the point of measurement will have a vapor pressure exceeding the static head.

REFERENCES:
patent: 2525807 (1950-10-01), Lane et al.
patent: 3031887 (1962-05-01), Weisend
patent: 3221551 (1965-12-01), Hogan et al.

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