1
Peter Flecken: Arrangement for generating natural resonant oscillations of a mechanical oscillating system. Flowtec, Barnes & Thornburg, January 31, 1989: US04801897 (82 worldwide citation)

An arrangement for generating natural resonant oscillations of a mechanical oscillating system includes an electromechanical oscillation exciter which on excitation by an electrical excitation signal generates a drive force setting the oscillating system in mechanical oscillations, an oscillation se ...


2
Dietmar Stadler: Measuring and operating circuit of a coriolis-type mass flow meter. Endress Hauser Flowtec, Bose McKinney & Evans, June 13, 2000: US06073495 (51 worldwide citation)

In order to raise the measuring accuracy of a Coriolis-type mass flow rate meter in a cost-effective fashion, the latter comprises a measuring tube (4), a subcircuit measuring circuit and a subcircuit exciting circuit. Two vibration sensors (17, 18) and a vibration exciting (16) are arranged on the ...


3
Peter Flecken, Niels Abildgaard: Mass flow meter operating by the Coriolis principle. Flowtec, Barnes & Thornburg, September 6, 1988: US04768384 (50 worldwide citation)

A mass flow meter operating by the Coriolis principle comprises a mechanical oscillating system having two straight measuring tubes which are clamped at both ends. The mechanical oscillating system is arranged axially in a support tube. In the center of the measuring tubes an oscillation exciter is ...


4
Guido Keel: Evaluation Electronics of a coriolis mass flow sensor. Endress Hauser Flowtec, Bose McKinney & Evans, July 15, 1997: US05648616 (48 worldwide citation)

In the evaluation electronics of a Coriolis mass flow sensor, two preamplifiers provide output signals that are applied to a fixed gain amplifier and a variable gain amplifier. Outputs from the two gain amplifiers are applied to a difference stage having an output coupled to a changeover switch. The ...


5
Peter Hafner, Peter Flecken: Arrangement for generating DC magnetic fields of alternating polarity for the magnetic-inductive flow measurement. Flowtec, Gerald J Ferguson Jr, Joseph J Baker, C Lamont Whitham, October 18, 1983: US04410926 (44 worldwide citation)

An arrangement for generating DC magnetic fields of alternating polarity for the magnetic-inductive flow measurement by means of a field coil which is connected via alternately controlled switching members to a DC voltage source, wherein during the reversal time following the change-over of the swit ...


6
Wolfgang Drahm: Coriolis-type mass flow sensor with flow condition compensating. Endress Hauser Flowtec, Barnes & Thornburg, July 2, 1996: US05531126 (43 worldwide citation)

This mass flow sensor is to be fitted with two straight tubes, but conventionally needed manifolds are to be dispensed with. The sensor can be installed, by flanges, in a conduit of a given diameter so as to be axially aligned with the conduit, through which flows a fluid to be measured. It has a st ...


7
Peter Flecken, Niels Abildgaard: Mass flow meter operating by the cariolis principle. Flowtec, Barnes & Thornburg, December 27, 1988: US04793191 (42 worldwide citation)

A mass flow meter operating by the Coriolis principle includes a mechanical oscillating system having two straight measuring tubes which are clamped at both ends. In the center of the measuring tubes an oscillation exciter is disposed which sets the two measuring tubes into oppositely phased flexura ...


8
Michael Lang, Michael Steinacher: Method and arrangement for flow rate measurement by means of ultrasonic waves. Flowtec, Barnes & Thornburg, October 1, 1991: US05052230 (41 worldwide citation)

For flow rate measurement by means of ultrasonic waves, on a measuring tube two ultrasonic transducers are arranged spaced apart from each other, one operating as transmitting transducer and the other as receiving transducer. For determining the flow rate the phase shift between the transmission sig ...


9
Wolfgang Drahm, Georg Szaloky, Alfred Wenger, Ennio Bitto, Ole Koudal, Christian Matt, Christian Schutze: Coriolis mass flow/density sensor with a single straight measuring tube. Endress Hauser Flowtec, Bose McKinney & Evans, December 28, 1999: US06006609 (39 worldwide citation)

This mass flow/density sensor (10), which can be installed in a pipe and through which a fluid to be measured flows during operation, is to be balanced over a wide density range, so that accurate measurements are possible. A single straight measuring tube (13) having a longitudinal axis (131) extend ...


10
Michael Herzog: Circuit for measuring capacitance by charging and discharging capacitor under test and its shield. Flowtec, Barnes & Thornburg, May 10, 1988: US04743837 (36 worldwide citation)

A capacitance measuring circuit operating by the principle of switched capacitors includes a switchover device which alternately and periodically with a predetermined switchover frequency connects the measured capacitance for charging to a constant voltage and for discharging to a storage capacitor ...