Measuring and testing – Liquid level or depth gauge
Reexamination Certificate
2004-06-22
2010-02-23
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
C073S054010, C073S054240
Reexamination Certificate
active
07665357
ABSTRACT:
A field device for monitoring and/or determining a process variable of a medium, wherein the process variable preferably is fill level, viscosity or density of the medium. The field device includes: an oscillatable unit; a driving/receiving unit, which excites the oscillatable unit to oscillate, or which receives the oscillations of the oscillatable unit, as the case may be; and a control/evaluation unit, which controls the oscillations of the oscillatable unit, or which evaluates the oscillations of the oscillatable unit, control/evaluation unit produces an accretion alarm, when the oscillation frequency (f) of the oscillations of the oscillatable unit falls below an adjustable limit value (G; GMinimum; GMaximum). The limit value (G; GMinimum; GMaximum) is determinable and/or calculable at least from measured and/or calculated dependencies of the oscillation frequency on process conditions and/or on the process variable to be monitored and/or determined.
REFERENCES:
patent: 4383443 (1983-05-01), Langdon
patent: 4594584 (1986-06-01), Pfeiffer et al.
patent: 4783987 (1988-11-01), Hager et al.
patent: 6389891 (2002-05-01), D'Angelico et al.
patent: 683 375 (1994-02-01), None
patent: 42 01 360 (1993-07-01), None
patent: 44 05 238 (1995-08-01), None
patent: 100 14 724 (2001-09-01), None
patent: 101 49 851 (2003-04-01), None
patent: 101 61 071 (2003-06-01), None
patent: 101 61 072 (2003-06-01), None
patent: 101 62 043 (2003-06-01), None
patent: 103 23 063 (2004-12-01), None
patent: WO 02/42724 (2002-05-01), None
Mueller Alexander
Rompf Christoph
Bacon & Thoms, PLLC
Endress & Hauser GmbH & Co. KG
Shabman Mark
Williams Hezron
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