EP0119790A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid level monitoring
Assignee: Imperial Chemical Industries Ltd
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Filing: 1984-03-08
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Granted: —
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Expires: 2004-03-08
Abstract
Abstract The level of liquid in a container, for example an upright cylinder of the kind used to store liquefied gas, is monitored by measuring the resonant frequency of the container and comparing it with a pre-determined standard. The resonant frequency is measured by applying mechanical vibrations, preferably of a frequency up to 1 OkHz, to the container and monitoring the resonant frequency using known methods. The results obtained are compared with the pre-determined standard, which is for example a calibration graph, to determine accurately the degree of filling of the container.
Inventors
- 👤 Peter Atkinson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:00
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; G01F23/2966
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
A method for determining the level of a liquid in a container which comprises measuring the resonant frequency of the container and comparing the measured frequency with a pre-determined standard.
Claim 2
Independent Claim
30 words
A method for determining the level of a liquid in a container which comprises measuring the resonant frequency of the container and comparing the measured frequency with a pre-determined standard.
Claim 3
Dependent Claim
42 words
A method as claimed in claim 1 wherein the method comprises generating mechanical vibrations from a source adjacent the container, the frequency of the generated vibrations being in the range up to 10 kilohertz, and monitoring the resonant frequency of the container.
Claim 4
Dependent Claim
29 words
A method as claimed in claim 1 or 2 in which the resonant frequency is monitored either radially across the container or transversely over the length of the container.
Claim 5
Independent Claim
30 words
A method as claimed in any one of the preceding claims in which the pre-determined standard is a calibration graph drawn up for different degrees of filling of the container.
Claim 6
Independent Claim
41 words
A method of monitoring changes in density of a fluid maintained at constant liquid level in a container which comprises measuring the resonant frequency of the container continuously or at intervals and comparing the measured frequencies with a pre- determined standard.
Claim 7
Independent Claim
41 words
A method of monitoring changes in density of a fluid maintained at constant liquid level in a container which comprises measuring the resonant frequency of the container continuously or at intervals and comparing the measured frequencies with a pre- determined standard.
References Cited (Backward Citations)
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