G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 23/28 (2006.01)
Patent
CA 2065405
Abstract In a level measuring device for containers (20) filled with fluid (10), preferably tanks in tank installations, the fill level height h is determined from the transit time of ultrasound pulses which are emitted by first sound pulse transmitters (S1) along a main measuring path (8) extending from the bottom region of the tank (20) to the fluid surface (9, 9') and reflected from the fluid surface (9, 9') to first sound pulse receivers (S1). Means are provided in the form of temperature sensors (1, 15, 16) for finding the temperature distribution throughout the fill level height h. Processing the measurements provides a mean temperature TM in the fluid volume. In addition to the main measuring path (8) there is a reference path (11) in the fluid volume, with second sound pulse transmitters and receivers (S2) and a reference temperature sensor (14) to measure a reference temperature TRef. The reference path makes it possible to find the sound velocity v*(TRef) in the fluid volume at the reference temperature TRef from the measured difference in transit time, so that a temperature-corrected sound velocity v(T) in the fluid volume: v(T) = v*(TRef)[1+Kk?.DELTA.T), and thus a temperature-corrected fill level height h(T) = v(T)?tH, are found, in which .DELTA.T = TM-TRef , and Kk is a medium dependent correction factor. The subject of the invention also includes a process for determining the fill level and an advantageous use of a measuring tube (24) comprising a first and a second sound waveguide (4,5). -45-
Dages Johannes
Ruttel Martin
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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