Temperature Compensator Patents (Class 177/226)
  • Publication number: 20090255736
    Abstract: A load cell unit which can satisfactorily measure the weight of a measured object if ambient temperature changes, and a weight checker and an electric balance using the load cell unit, are provided. A strain generating element includes plural strain generating portions. Each of strain gauges is a gauge of a temperature/sensitivity compensated type and is placed in a position on a corresponding strain generating portion. A bridge circuit includes the strain gauges. A zero compensation element compensates the zero of the bridge circuit in accordance with the temperature of the strain generating element, to roughly correct an output of the bridge circuit. A thermal sensitive resistor is a temperature sensor for detecting the temperature of the strain generating element. The zero compensation element and the thermal sensitive resistor are provided on a thick portion interposed between adjacent strain generating portions. A signal processor minutely corrects a roughly-corrected output of the bridge circuit.
    Type: Application
    Filed: August 24, 2007
    Publication date: October 15, 2009
    Inventors: Kazufumi Naito, Shoko Tajiri, Shinji Takeichi
  • Patent number: 5207284
    Abstract: A load indicator conversion system is disclosed for converting a scale having a mechanical measuring system, such as a conventional portable beam scale, into a scale having an electronic measuring system for providing an electronic display, such as an LCD display, corresponding to the load applied to the mechanical load receiver of the scale, such as the scale platform [104], which is mechanically linked via the beam load rod assembly [110] and an s-hook arrangement [150] to a load cell transducer [1]. A single common temperature sensor is employed adjacent the load cell and the associated electronics to provide information on the variations in temperature to the microprocessor for enabling temperature compensation to take place.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: May 4, 1993
    Assignee: Fairbanks, Inc.
    Inventors: Alec T. Douglas, Harry J. Keen
  • Patent number: 4300646
    Abstract: An electromagnetically compensated precision scale has a load support guided for parallel movement by a guide assembly comprising upper and lower guides defining a triangular shape in plan connected to a housing and to the load support by flexible couplings, and wherein the guides are one-piece and define a vertical joint at the triangle apex, thereby reducing inaccurate readings caused by thermal effects.
    Type: Grant
    Filed: September 27, 1979
    Date of Patent: November 17, 1981
    Assignee: Sartorius GmbH
    Inventors: Franz-Josef Melcher, Christoph Berg, Erich Knothe
  • Patent number: 4094370
    Abstract: Vessel for weighing hot or cold fluid materials, having an elastic filling conduit of which a temperature difference may give a reading error. This error is corrected by a prestressing force on this conduit.
    Type: Grant
    Filed: July 21, 1976
    Date of Patent: June 13, 1978
    Assignee: Stichting Energieonderzoek Centrum Nederland
    Inventor: Johannes Petrus Ruiter