Patents Assigned to Krohne A.G.
  • Patent number: 7219557
    Abstract: A method for calculating the temperature of a medium traveling through a measuring tube, while with the aid of at least one field coil a magnetic field is generated which permeates the measuring tube. The electrical resistance of the field coil is measured and the temperature of the field coil, constituting a first temperature, is calculated based on the measured resistance of the field coil. A temperature measurement, constituting the second temperature, is taken at a location other than that of the field coil and the temperature of the flowing medium is calculated on the basis of the first and second temperatures. This provides the user of the flow measuring method an added benefit in that it gives the possibility, in simple fashion, to determine the temperature of the flowing medium. A flowmeter for measuring the medium temperature according to the method is also disclosed.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: May 22, 2007
    Assignee: Krohne, A.G.
    Inventor: Arnould Leendert van Willigen
  • Patent number: 7199633
    Abstract: A method for generating short electric pulses, comprising the steps of generating a control pulse, feeding the control pulse to a bipolar transistor, which subsequently emits an output signal with a steep switch-off side by exploiting the charge storage effect of the bipolar transistor, and differentiating the output signal with the steep switch-off side so that short primary pulses are generated. An electric pulse generator is also disclosed.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: April 3, 2007
    Assignee: Krohne A.G.
    Inventors: Michael Gerding, Burkhard Schiek, Thomas Musch
  • Patent number: 7174256
    Abstract: The magnetoinductive flowmeter measures the flow volume of a medium traveling through a measuring tube, with a magnet that serves to generate a magnetic field permeating the measuring tube that has a magnetic-field component that extends perpendicular to the direction of flow. The flowmeter also includes a first measuring electrode and a second measuring electrode for collecting a voltage induced in the medium, a reference electrode, as well as a preamplifier to which the potentials collected by the two measuring electrodes are fed. A control circuit element is provided for controlling the common-mode input voltage of the preamplifier and/or the potential span of the dynamic range of the preamplifier in such fashion that the said common-mode input voltage of the preamplifier corresponds to approximately half the maximum output voltage of the preamplifier. This concept also permits the use of preamplifiers that operate with a low supply voltage such as 0/5 V. A measuring method is also disclosed.
    Type: Grant
    Filed: November 1, 2004
    Date of Patent: February 6, 2007
    Assignee: Krohne A.G.
    Inventors: Helmut Brockhaus, Wilhelm Florin
  • Patent number: 7171336
    Abstract: A method for operating a measuring instrument is capable of performing multiple diagnostic functions. For this, a process control is provided for the execution of the diagnostic functions in a manner whereby the normal measuring operation of the measuring instrument is interrupted, a first diagnostic function is performed during that interruption, the normal measuring operation is resumed after completion of the first diagnostic function, the normal measuring operation is again interrupted, and during that later interruption of the normal measuring operation a second diagnostic function is performed. In this fashion, even numerous diagnostic functions can be easily and efficiently integrated into the operation of a measuring instrument such as a magnetoinductive flowmeter.
    Type: Grant
    Filed: November 29, 2004
    Date of Patent: January 30, 2007
    Assignee: Krohne A.G.
    Inventor: Helmut Brockhaus
  • Patent number: 7136777
    Abstract: A Coriolis mass flowmeter incorporates at least one measuring tube, at least one oscillator for the excitation of the measuring tube and at least one oscillation detector for registering the oscillations of the measuring tube, with an activator serving to energize the oscillator, at least one evaluation unit serving to analyze the oscillations registered by the oscillation detector, an excitation signal path including excitation signal-path devices provided between the activator and the oscillator for transmitting an excitation signal, and a measuring signal path with measuring signal-path devices provided between the oscillation detector and the evaluation unit for transmitting the measuring signal.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: November 14, 2006
    Assignee: Krohne A.G.
    Inventor: Ralf Storm
  • Patent number: 6923073
    Abstract: An ultrasonic flow-measuring method measures the flow rate of a medium traveling through a measuring conduit by means of two ultrasound transducers which in the flow direction of the medium are offset relative to each other and both of which alternate in emitting ultrasonic pulses while the respective other ultrasound transducer receives the emitted ultrasonic pulses and the flow rate is determined as a function of the run times of the ultrasonic pulses received by the respective other ultrasound transducer. At least one correction parameter is established on the basis of the calculated sound propagation of the ultrasonic pulses traveling from one ultrasound transducer to the other, the calculation of the sound propagation of those pulses is made by taking into account a predefined frequency spectrum of the oscillations of the ultrasound transducers and the flow rate is calculated by applying the correction parameter established.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: August 2, 2005
    Assignee: Krohne, A.G.
    Inventors: Jeroen Martin van Klooster, Arie Huijzer
  • Patent number: 6889561
    Abstract: Disclosed is a method for correcting the measurement signal of a mass flowmeter for flowing media of the type which works on the Coriolis principle and has at least one straight measuring tube conveying the flowing medium, at least one oscillation generator acting on the measuring tube, at least one measurement value sensor detecting Coriolis forces and/or Coriolis oscillations based on Coriolis forces and outputting a measurement signal and a supporting tube accommodating the measuring tube, the oscillation generator and the measurement value sensor, whereby the measuring tube and the supporting tube are connected to one another in a manner excluding relative axial movements and the axial spacing of the fixing points of the supporting tube on the measuring tube represents the oscillation length of the measuring tube.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: May 10, 2005
    Assignee: Krohne A.G.
    Inventors: Yousif A. Hussain, Edward P. Jukes
  • Patent number: 6874373
    Abstract: A mass flowmeter that operates by the Coriolis principle and incorporates an enclosure, a Coriolis line and a connection that connects the mass flowmeter to a port of a pipeline system. The connection includes a connecting element and a separate mounting element, the connecting element is welded to one end of the Coriolis line while also serving to establish a conductive connection between the Coriolis line and the pipeline system via the port of the pipeline system, and the mounting element is firmly attached to the enclosure of the mass flowmeter while securing the mass flowmeter to the port of the pipeline system, the above thus constituting an easy-to-manufacture food-handling connection system for a mass flowmeter.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: April 5, 2005
    Assignee: Krohne A.G.
    Inventor: Chris M. Rolph
  • Patent number: 6868740
    Abstract: A mass flow rate measuring process measures the pressure on a mass flow rate measuring device. The mass flow rate measuring device works on the Coriolis principle and has a measuring line whereby a tension sensor is provided and the tension sensor is attached to the measuring line in such a way that the mechanical tension of the measuring line can be recorded with the tension sensor. A pressure signal output facility is also provided, the tension sensor is connected with the pressure signal output facility for transmitting a tension signal thereto and a pressure signal ascertained on the basis of the tension signal is outputtable by the pressure signal output facility. In this way, a Coriolis mass flow rate measuring device is provided, with which an additional parameter, i.e. the pressure of the medium flowing through the measuring line, can be recorded.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: March 22, 2005
    Assignee: Krohne A.G.
    Inventor: Yousif A. Hussain
  • Patent number: 6843136
    Abstract: A magnetoinductive flowmeter that serves to measure the flow rate of a moving medium incorporates a measuring conduit, a sampling-electrode channel extending through the wall of the measuring conduit, and a sampling electrode, which sampling electrode is positioned in the sampling-electrode channel in such fashion that its sampling-electrode head is recessed from the inner wall of the measuring conduit. A section of the sampling-electrode channel located in front of the sampling-electrode head and extending up to the interior of the measuring conduit is left as a free space. This results in an improved signal-to-noise ratio of a voltage signal collected at the sampling electrode.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: January 18, 2005
    Assignee: Krohne, A.G.
    Inventors: Friedrich Hofmann, Arnould L. van Willigen, Bosboom J. Poortmann
  • Patent number: 6799475
    Abstract: A flowmeter includes a measuring tube, an ultrasound transducer, an ultrasound waveguide and a seal. The ultrasound transducer connects outside the measuring tube to the ultrasound waveguide, the ultrasound waveguide protruding at least partly into the measuring tube, in such fashion that ultrasound waves generated by the ultrasound transducer can be transferred to the ultrasound waveguide and, conversely, ultrasound waves received by the ultrasound waveguide can be transferred to the ultrasound transducer, The seal is positioned between the ultrasound waveguide and the measuring tube. This reduces cross coupling while at the same time enhancing the flow pattern.
    Type: Grant
    Filed: September 11, 2002
    Date of Patent: October 5, 2004
    Assignee: Krohne A.G.
    Inventor: Jeroen Martin van Klooster
  • Patent number: 6799476
    Abstract: A mass flowmeter and a method for operating a mass flowmeter is based on the Coriolis principle and incorporates a Coriolis measuring tube, an oscillator associated with and stimulating said Coriolis measuring tube, and a transducer associated with the Coriolis measuring tube and which collects Coriolis forces and/or oscillations based on Coriolis forces. The electric power consumed in the mass flowmeter is controlled as a function of the available electric power. This permits the efficient use of the available electric power, thus permitting the operation of the mass flowmeter via a two wire interface that serves for both the input of electric power and the output of measuring data.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: October 5, 2004
    Assignee: Krohne A.G.
    Inventor: Helmut Brockhaus
  • Patent number: 6669636
    Abstract: An ultrasound transmitter and/or receiver/transceiver system includes an ultrasound transducer, an ultrasound waveguide and a jacket, where said ultrasound waveguide is positioned within the jacket, the ultrasound transducer is located at one end of the ultrasound waveguide and at said end of the ultrasound waveguide, the ultrasound transducer can transfer ultrasound waves to, and receive them from, the ultrasound waveguide. An impedance step is provided between the ultrasound transducer and the area of the jacket facing away from the ultrasound transducer. In this fashion, when the ultrasound transmitter and/or receiver system per the invention is installed for instance in the measuring tube of a measuring device, undesirable cross coupling and crosstalk can be sharply reduced.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: December 30, 2003
    Assignee: Krohne A.G.
    Inventor: Jeroen Martin van Klooster
  • Patent number: 6598281
    Abstract: A method for mounting a metal body on an essentially straight measuring tube, made of titanium or zirconium, of a Coriolis mass flowmeter. The method ensures secure retention of the metal body on the measuring tube even through very extended operation of the Coriolis mass flowmeter, in that the metal body is shrink-mounted on the measuring tube.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: July 29, 2003
    Assignee: Krohne A.G.
    Inventors: Vincent Cook, Lawrence Davies, Neil Harrison, Yousif Hussain, Chris N. Rolph
  • Patent number: 6557422
    Abstract: A method for online-determination of at least one characteristic value of a mass flowmeter operating by the Coriolis principal and incorporating a fluid-conducting Coriolis conduit. The method includes the following steps of exciting the Coriolis conduit in a first oscillation pattern, exciting the Coriolis conduit in a second oscillation pattern, the second oscillation pattern being different from the first oscillation pattern, capturing the response of the Coriolis conduit to the excitation in the first oscillation pattern and in the second oscillation pattern and determining at least one characteristic value of the mass flowmeter by evaluating the response of the Coriolis conduit with the aid of a model in real time during operation of the mass flowmeter.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: May 6, 2003
    Assignee: Krohne A.G.
    Inventor: Kourush Kolahi
  • Patent number: 6519828
    Abstract: Description and illustration of a method for mounting a metal body (1) on an essentially straight measuring tube (2), made of titanium or zirconium, of a Coriolis mass flowmeter. The method ensures secure retention of the metal body (1) on the measuring tube (2) even through very extended operation of the Coriolis mass flowmeter, in that the metal body (1) is shrink-mounted on the measuring tube (2).
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: February 18, 2003
    Assignee: Krohne A.G.
    Inventors: Vincent Cook, Lawrence Davies, Neil Harrison, Yousif Hussain, Chris N. Rolph
  • Patent number: 6516674
    Abstract: A mass flowmeter operating by the Coriolis principle, with one essentially straight fluid-conducting Coriolis measuring tube, at least one oscillator associated with and exciting the Coriolis measuring tube, at least one detector associated with the Coriolis measuring tube and capturing the Coriolis forces and/or the Coriolis oscillations generated by Coriolis forces, and a compensating cylinder in which the Coriolis measuring tube is mounted by way of a mechanical connection to the compensating cylinder. The measuring accuracy of the mass flowmeter is further improved to a considerable extent by balancing both the excitation oscillation and the Coriolis oscillation of the Coriolis measuring tube within the compensating cylinder.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: February 11, 2003
    Assignee: Krohne A.G.
    Inventor: Andreas Poremba
  • Patent number: 6404288
    Abstract: An arrangement for generating a first alternating signal and a second alternating signal that is in a predetermined, fixed frequency relation to the first signal. The arrangement may be used as a time based generator for a level meter that operates according to the radar principle and whose measuring system is based on the time domain reflectometry (TDR) measuring principle.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: June 11, 2002
    Assignee: Krohne A.G.
    Inventors: Achim Bletz, Alexandre Thollet
  • Patent number: 6400648
    Abstract: An ultrasonic waveguide for guiding an ultrasonic signal situated in a predetermined frequency range is illustrated and described. The ultrasonic waveguide according to the invention is characterized in that it has a coiled foil whose layer thickness is considerably less than the smallest wavelength of the ultrasonic signal in the predetermined frequency range in the foil material. The result is that ultrasonic signal interference and attenuation in the ultrasonic waveguide due to scattering and dispersion are largely avoided.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: June 4, 2002
    Assignee: Krohne A.G.
    Inventors: Alexander Marnix Heijnsdijk, Jeroen Martin van Klooster
  • Patent number: 6397685
    Abstract: A mass flowmeter operating by the Coriolis principle and incorporating an essentially straight, moving-fluid-conducting Coriolis measuring tube, at least one oscillator associated with and exciting the Coriolis measuring tube, at least one detector associated with the Coriolis measuring tube and sensing the Coriolis forces and/or the Coriolis oscillations generated by Coriolis forces, and a compensating cylinder in which the Coriolis measuring tube is positioned, the Coriolis measuring tube and the compensating cylinder being connected to each other in which the oscillation-capable system composed of the Coriolis measuring tube and the compensating cylinder is at least to a large extent mass-equalized both for the excitation oscillation of the Coriolis measuring tube and for the Coriolis oscillation of the Coriolis measuring tube.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: June 4, 2002
    Assignee: Krohne A.G.
    Inventors: Vincent Cook, Lawrence Davies, Neil Harrison, Yousif Hussain, Chris N. Rolph