Measuring and testing – Liquid level or depth gauge
Patent
1998-04-06
2000-10-31
Williams, Hezron
Measuring and testing
Liquid level or depth gauge
7386127, 340621, G01F 2300
Patent
active
061385077
ABSTRACT:
An apparatus for establishing and/or monitoring a predetermined filling level in a container is described, in which a fixed phase difference (.DELTA..phi..sub.R), which is independent of the oscillation quality of the apparatus, exists between a transmission signal and a reception signal (E) at the resonant frequency (f.sub.r) of the mechanical oscillatory structure. This apparatus comprises a mechanical oscillatory structure (1), an electromechanical transducer (2) having at least one transmitter (23) and a receiver (24), an evaluation unit (9), which determines the frequency of the reception signal (E), compares it with a reference frequency (f.sub.R) and generates an output signal which indicates that the mechanical oscillatory structure (1) is covered by a charge material if the frequency has a value which is less than the reference frequency (f.sub.R) and a control loop, which regulates a phase difference existing between the electrical transmission signal and the electrical reception signal (E) to a specific, constant value at which the oscillatory structure (1) oscillates at a resonant frequency (f.sub.r). A reception signal line (6), which transmits the reception signal (E), is connected via an electrical impedance (Z) to a transmission signal line (5), which transmits the transmission signal.
REFERENCES:
patent: 3625058 (1971-12-01), Endress et al.
patent: 4540981 (1985-09-01), Lapetina et al.
patent: 4594584 (1986-06-01), Pfeiffer et al.
patent: 5625343 (1997-04-01), Rottmar
patent: 5631633 (1997-05-01), Dreyer et al.
patent: 5717383 (1998-02-01), Dreyer et al.
patent: 5743134 (1998-04-01), Dreyer et al.
patent: 5757104 (1998-05-01), Getman et al.
patent: 5895848 (1999-04-01), Wilson et al.
patent: 5966983 (1998-09-01), Pfeiffer et al.
patent: 5969621 (1999-10-01), Getman et al.
Dreyer Volker
Getman Igor
Lopatin Sergej
Cygan Michael
Endress & Hauser GmbH & Co.
Williams Hezron
LandOfFree
Apparatus for establishing and/or monitoring a predetermined fil does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for establishing and/or monitoring a predetermined fil, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for establishing and/or monitoring a predetermined fil will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2039776