Gaseous Oxygen Or Oxygen Containing Compound Patents (Class 205/783)
  • Patent number: 10057765
    Abstract: An operation method of a master node, the method including transmitting, to a slave node, a first resource reservation information including packet information about a packet to be transferred between the master node and the slave node; allocating a radio resource corresponding to the first resource reservation information, for exchanging security information; transferring the packet using the allocated radio resource; and determining whether the packet was successfully transferred based on the packet information.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: August 21, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyosun Hwang, Misuk Huh, Sang Joon Kim, Jongwook Lee
  • Patent number: 9093690
    Abstract: The invention relates to a sensor fuel cell that can be activated by a first substance (O2) in its environment. The sensor fuel cell includes a catalytically active anode, a cathode that has a cathode surface at least partially exposed to the environment, and a proton-conductive membrane located between the anode and the cathode so as to convey protons through from the anode to the cathode. An anode surface of the anode is at least partially exposed to the environment for access of at least one second substance (H2) from the environment to the anode. Such a disposition enables access of a first reactant in the form for example of oxygen from the ambient air to the cathode, and additionally access of a second reactant in the form for example of hydrogen from the ambient air to the free surface of the anode.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: July 28, 2015
    Assignee: Micronas GmbH
    Inventors: Gilbert Erdler, Holger Reinecke, Claas Mueller, Mirko Frank
  • Publication number: 20150021203
    Abstract: The disclosed invention relates to an amperometric gas sensor for measuring the concentration of an analyte, comprising: a solid support; and a working electrode in contact with the solid support; wherein the analyte comprises a dopant which when in contact with the solid support increases the electrical conductivity of the solid support. A sterilization process employing the amperometric gas sensor is disclosed.
    Type: Application
    Filed: September 30, 2014
    Publication date: January 22, 2015
    Inventors: Elizabeth H. Schenk, Peter A. Burke, Michael A. Centanni
  • Publication number: 20150021204
    Abstract: The disclosed invention relates to an amperometric gas sensor for measuring the concentration of an analyte, comprising: a solid support; and a working electrode in contact with the solid support; wherein the analyte comprises a dopant which when in contact with the solid support increases the electrical conductivity of the solid support. A sterilization process employing the amperometric gas sensor is disclosed.
    Type: Application
    Filed: September 30, 2014
    Publication date: January 22, 2015
    Inventors: Elizabeth H. Schenk, Peter A. Burke, Michael A. Centanni
  • Patent number: 8845871
    Abstract: An electrochemical oxygen sensor includes a micro-porous plastic membrane supported on a sealing disk and located between a gas inflow port and the sensor's electrolyte. The membrane and disk minimize thermal shock effects due to using the sensor at a first location, at a first temperature, and then moving it to a second location at a different temperature.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: September 30, 2014
    Assignee: Honeywell International Inc.
    Inventors: John Chapples, John Anthony Tillotson, Ian McLeod, Martin Williamson
  • Patent number: 8840765
    Abstract: The present invention concerns an electrochemical sensor for determining oxygen dissolved in an aqueous measuring medium, a process for its production as well as a method for determining oxygen dissolved in an aqueous measuring medium using the electrochemical sensor.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: September 23, 2014
    Assignee: Roche Diagnostics Operations, Inc.
    Inventor: Helmut Offenbacher
  • Patent number: 8815077
    Abstract: An electrochemical sensor for measuring the oxygen partial pressure in a process fluid, comprises an electrolyte-filled sensor body, which is covered on one side charged with the process fluid by an oxygen-permeable membrane, a cathode on the membrane, an annular guard electrode surrounding the cathode, which in measuring operation lies at the same potential as the cathode, an anode charged by the electrolyte in the sensor body, a reference electrode charged by the electrolyte in the sensor body, wherein between the anode and cathode a voltage can be applied, which is controlled between the cathode (8) and reference electrode at a constant polarization voltage and the measuring sensor current flowing in measuring operation between the cathode and anode is a measure for the oxygen partial pressure in the process fluid, and a test voltage source which can be switched in a testing mode between the cathode and guard electrode for producing test oxygen in the electrolyte and/or in the process fluid between the
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: August 26, 2014
    Assignee: Knick Elektronische Messgeräte GmbH & Co. KG
    Inventors: Heinz Wohlrab, René Oberlin
  • Patent number: 8795512
    Abstract: A method for measuring and/or calibrating a gas sensor for determining oxygenic gas components in gas mixtures in exhaust gases of internal combustion engines. The gas sensor has one internal pump electrode IPE, one external pump electrode APE and one decomposition electrode NOE. The measurement and/or calibration may be carried out during the ongoing operation of the gas sensor by removing the gas component and/or oxygen from one of the chambers, by introducing oxygen in a controlled manner into one of the chambers with the aid of electrochemical pumping processes. The changes caused by the introduced oxygen are measured against an additional electrode and the gas sensor may be measured and/or calibrated using the measured values.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: August 5, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Thomas Classen
  • Publication number: 20140154811
    Abstract: Technologies are generally described for gas filtration and detection devices. Example devices may include a graphene membrane and a sensing device. The graphene membrane may be perforated with a plurality of discrete pores having a size-selective to enable one or more molecules to pass through the pores. A sensing device may be attached to a supporting permeable substrate and coupled with the graphene membrane. A fluid mixture including two or more molecules may be exposed to the graphene membrane. Molecules having a smaller diameter than the discrete pores may be directed through the graphene pores, and may be detected by the sensing device. Molecules having a larger size than the discrete pores may be prevented from crossing the graphene membrane. The sensing device may be configured to identify a presence of a selected molecule within the mixture without interference from contaminating factors.
    Type: Application
    Filed: November 30, 2012
    Publication date: June 5, 2014
    Inventors: Angele Sjong, Kraig Anderson, Gary L. Duerksen, Seth Adrian Miller
  • Patent number: 8691071
    Abstract: A method for measuring the transmission rate of an analyte through a film. The method includes the steps of (i) separating a chamber into a first cell and a second cell with a known area of a film, (ii) flushing the first cell with an inert gas to remove any target analyte from the first cell, (iii) introducing a gas containing a known concentration of an analyte into the second cell, (iv) sealing the first cell to gas flow through the first cell, and (v) sensing any analyte in the first cell with a sensor that consumes the analyte at a rate greater than the rate at which the analyte is passing through the film, until a steady state rate of analyte consumption is measured by the sensor.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: April 8, 2014
    Assignee: Mocon, Inc.
    Inventors: Daniel W. Mayer, Stephen D. Tuomela
  • Publication number: 20140021065
    Abstract: The invention relates to a device for the measurement of hydrogen peroxide and optionally other biomarkers in a gaseous mixture, and in particular to a microfabricated device. The device comprises hydrogen peroxide capturing means and an electromechanical sensor comprising a sensing element in direct contact with the capturing means. The device further comprises means to measure the potential of the sensing element and/or the current through it as a result of a changing hydrogen peroxide concentration in the gaseous mixture. The device also comprises cooling/heating means for cooling and/or heating the capturing means. The device is preferably applied for online measurement of the hydrogen peroxide content in exhaled air.
    Type: Application
    Filed: November 18, 2011
    Publication date: January 23, 2014
    Applicant: SENZAIR B.V.
    Inventors: Justyna Wiedemair, Wouter Olthuis, Albert Van Den Berg
  • Patent number: 8518237
    Abstract: The service life of amperometric electrochemical oxygen sensors is increased by operating the electrodes of such sensors at a polarization voltage suitable for measuring the oxygen content of samples only during calibration or when measuring such samples and thereafter modulating the polarization voltage to a lower voltage such that substantially no electrical current is produced by the electrodes.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: August 27, 2013
    Assignee: Siemens Healthcare Diagnostics Inc.
    Inventors: Andy Chan, Lawrence Milesky
  • Patent number: 8252158
    Abstract: An electrochemical oxygen sensor includes a micro-porous plastic membrane supported on a sealing disk and located between a gas inflow port and the sensor's electrolyte. The membrane and disk minimize thermal shock effects due to using the sensor at a first location, at a first temperature, and then moving it to a second location at a different temperature.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: August 28, 2012
    Assignee: Honeywell International Inc.
    Inventors: John Chapples, John Anthony Tillotson, Ian McLeod, Martin Williamson
  • Patent number: 8241487
    Abstract: A sensing device includes a sensing surface, and a matrix overlaying the sensing surface. The sensing device includes a photoformed membrane overlaying at least a portion of the matrix. The photoformed membrane includes a directly photoformed organosiloxane polymer that is substantially permeable to gaseous molecules and substantially impermeable to non-gaseous molecules and ions.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: August 14, 2012
    Assignee: Abbott Point of Care Inc.
    Inventors: Margot Leanne McCann, Sandra Kay Shaw, Karl John Anthony Underwood, Harvey Eric Rabe
  • Patent number: 8216447
    Abstract: The invention disclosed is a total organic carbon (TOC) analyzer comprised of an electrochemical cell comprising a diamond-film electrode doped with boron or other conductivity inducing material. The diamond-film electrode is the working electrode and carries out the oxidation of TOC to produce carbon dioxide. The apparatus further comprises sensors for detecting the carbon dioxide produced. Such sensors include but are not limited to a tunable diode laser and/or ion-selective electrode. The invention also discloses a method for measuring TOC in an aqueous solution using a total organic carbon analyzer.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: July 10, 2012
    Assignee: O.I. Corporation
    Inventor: Samuel P. Kounaves
  • Patent number: 8163165
    Abstract: The present invention relates to electrochemical sensors for determining gaseous analytes in an aqueous measuring medium, to a process for producing such sensors, and to a process for determining gaseous analytes dissolved in an aqueous measuring medium using the electrochemical sensors. The electrolyte layer of the sensors comprises at least one particulate material and at least one binder which together form a porous, non-swellable framework structure, wherein the pores in this framework structure are configured to absorb a liquid electrolyte or contain the liquid electrolyte.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: April 24, 2012
    Assignee: Roche Diagnostics Operations, Inc.
    Inventors: Helmut Offenbacher, Gregor Steiner, Claudia-Gemma Muresanu
  • Patent number: 8152991
    Abstract: Embodiments of nanoelectronic sensors are described, including sensors for detecting analytes such ammonia. An environmental control system employing nanoelectronic sensors is described. A personnel safety system configured as a disposable badge employing nanoelectronic sensors is described. A method of dynamic sampling and exposure of a sensor providing a number of operational advantages is described.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: April 10, 2012
    Assignee: Nanomix, Inc.
    Inventors: Mikhail Briman, Craig Bryant, Ying-Lan Chang, Jean-Christophe P. Gabriel, Shirpal C. Gandhi, Bradley N Johnson, Willem-Jan Ouborg, John Loren Passmore, Kastooriranganathan Ramakrishnan, Sergei Skarupo, Alexander Star, Christian Valcke
  • Publication number: 20110284394
    Abstract: A multiphase microreactor includes gas and liquid microchannels separated by a nanoporous membrane. Rapid mass transfer of gas samples into the liquid electrolyte allows the microchannel/membrane assembly to be used as a fast and sensitive gas sensor. When the oxime chemistry is adapted into the microchannel sensor, the microchannel sensor selectively responds to organophosphates and organophosphate simulants. In addition, a double microchannel design may be used to reduce voltage drift and incorporate a reference electrode into the sensor assembly. Methods of detecting organophosphates are also disclosed.
    Type: Application
    Filed: February 14, 2008
    Publication date: November 24, 2011
    Applicant: The Board of Trustees of the University Illinois Office Technology
    Inventors: Richard I. Masel, Chelsea Monty, Ilwhan Oh
  • Publication number: 20100264042
    Abstract: A method of determining the general or a specific condition of a subject is disclosed, the method comprising measuring the concentration of each of a plurality of components in a single sample of the gas stream exhaled by the subject; and generating information regarding the concentration of each of the plurality of components such that the concentrations of the components are directly comparable. The method is particularly suitable for assessing the condition of the respiratory system of a subject. The method preferably employs electrochemical sensors to measure the concentration of the target components in the exhaled gas stream.
    Type: Application
    Filed: October 24, 2008
    Publication date: October 21, 2010
    Applicant: ANAXSYS TECHNOLOGY LTD
    Inventors: Mark Varney, Michael Garrett
  • Patent number: 7811433
    Abstract: An electrochemical sensor is provided for the detection of carbon dioxide gas. The sensor includes a non-conductive solid substrate and at least one each of a metal oxide sensing electrode, a reference electrode and a counter electrode positioned on the substrate. A solid polymer electrolyte anion-exchange membrane is in intimate contact with the sensing electrode, reference electrode and counter electrode. The sensor is highly sensitive and selective to carbon dioxide and has very rapid response time.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: October 12, 2010
    Assignee: Giner, Inc.
    Inventors: Mourad Manoukian, Anthony B. LaConti, Linda A. Tempelman, John Forchione
  • Patent number: 7744740
    Abstract: In a procedure to recognize the gas composition of a gas mixture, which consists of at least two gases of preferably different diffusion properties, delivered to a wideband lambda sensor, especially a gas mixture of an exhaust gas of an internal combustion engine of a motor vehicle, whereby the lambda sensor has a pumping cell with at least one gas measurement chamber, provision is made for the recognition of the gas composition of the gas mixture to result by means of modulation of the gas in the gas measurement chamber. Preferably the air number in the gas measurement chamber of the pumping cell is periodically altered, whereby the sensitivity of the lambda sensor to the gases, of which there are at least two, likewise periodically changes.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: June 29, 2010
    Assignee: Robert Bosch GmbH
    Inventor: Lothar Diehl
  • Patent number: 7704374
    Abstract: An electrochemical gas sensor is provided with a carbon-based measuring electrode (3) that it can be used for a large number of electrochemical detection reactions and can be manufactured at a low cost. The measuring electrode (3) contains carbon nanotubes.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: April 27, 2010
    Assignee: Drägerwerk Aktiengesellschaft
    Inventors: Sabrina Sommer, Herbert Kiesele, Frank Mett
  • Publication number: 20100051480
    Abstract: The presently disclosed subject matter relates to sensors for measuring an amount of a gaseous species in a sample. The sensors comprise a gas permeable polysiloxane network membrane, comprising both alkyl and fluorinated alkyl groups. In some embodiments, the polysiloxane network can be formed from the co-condensation of a mixture of an alkylalkoxysilane and a fluorosilane. The presently disclosed subject matter also relates to methods of making the sensors, methods of selectively measuring an amount of a gaseous species, such as nitric oxide, in a sample, and to compositions comprising the polysiloxane networks.
    Type: Application
    Filed: August 24, 2007
    Publication date: March 4, 2010
    Applicant: The University of North Carolina at Chapel Hill
    Inventors: Mark H. Schoenfisch, Jae Ho Shin
  • Patent number: 7413687
    Abstract: A device for conducting protons at a temperature below 550° C. includes a LAMOX ceramic body characterized by an alpha crystalline structure.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: August 19, 2008
    Assignee: UT - Battelle, LLC
    Inventors: Timothy R. Armstrong, Edward A. Payzant, Scott A. Speakman, Martha Greenblatt
  • Publication number: 20080116083
    Abstract: An electrochemical gas sensor with a plurality of electrodes is provided with an electrolyte, with a gas-permeable membrane (1), with a gas-permeable and conductive carrier layer (2) applied to the membrane (1) and with at least one measuring electrode (3) applied to the carrier layer (2). The measuring electrode (3) is of a punctiform design and the electrochemical potential difference of the reaction between the carrier layer (2) and the measuring electrode (3) is at least 20 mV, can be manufactured in a compact form and makes possible an especially low power consumption for measured gases in the percentage range.
    Type: Application
    Filed: August 22, 2007
    Publication date: May 22, 2008
    Applicant: DRAGER SAFETY AG & CO. KGaA
    Inventor: Uwe KUHN
  • Publication number: 20070251835
    Abstract: A fluid infusion system as described herein includes a number of local “body network” devices, such as an infusion pump, a handheld monitor or controller, a physiological sensor, and a bedside or hospital monitor. The body network devices can be configured to support communication of status data, physiological information, alerts, control signals, and other information between one another. In addition, the body network devices can be configured to support networked communication of status data, physiological information, alerts, control signals, and other information between the body network devices and “external” devices, systems, or communication networks. The networked medical devices are configured to support a variety of wireless data communication protocols for efficient communication of data within the medical device network.
    Type: Application
    Filed: February 5, 2007
    Publication date: November 1, 2007
    Applicant: MEDTRONIC MINIMED, INC.
    Inventors: Kaezad J. MEHTA, John J. MIKA
  • Patent number: 7208071
    Abstract: A dissolved oxygen sensor having a cathode and anode immersed in an electrolyte is designed to provide a low background current in the sensor when a potential is applied to the cathode. The background current is maintained at a desired level by selecting the area and length of a channel or path of diffusion of residual oxygen in the electrolyte to the cathode. The area (A) of the diffusion channel in relation to its length (L) is selected to be at or below a selected ratio, A/L.
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: April 24, 2007
    Assignee: Rosemount Analytical Inc.
    Inventor: Chang-Dong Feng
  • Patent number: 6960290
    Abstract: A testing and calibrating device for an evaluation circuit of a linear oxygen probe (S) of an internal combustion engine is disclosed. Said device comprises a probe equivalent circuit (SES) having the same terminals (Vs+, Vs?/Vp?, Vp+ and Rc) as the oxygen probe (S). The probe equivalent circuit can largely emulate the electrical and chemical behaviors of the oxygen probe (S) and simulate probe faults and, at least during a testing and calibrating process, is connected to the evaluation circuit in place of the oxygen probe (S) or is connected parallel to said oxygen probe.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: November 1, 2005
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dariusch Akhavan, Stephan Bolz
  • Patent number: 6896781
    Abstract: A highly accurate, long life, low cost gas sensor is disclosed, particularly useful for measuring carbon monoxide and other toxic gases in an environment. The gas sensor has a first, sensing electrode and a second, counting electrode. Positioned between the first and second electrodes is an ion conducting, solid electrolyte membrane. In response to the presence of a toxic gas introduced to the first electrode, an electric signal is produced between the first electrode and the second electrode. The electric signal changes in response to changes in the concentration of the toxic gas. Detection circuitry measures the electric signal to determine the concentration of the toxic gas. An electrically conductive, hydrophobic top membrane electrically connects the first electrode to the detection circuitry while preventing liquid water from contacting the first electrode. An electrically conductive, hydrophobic bottom membrane electrically connects the second electrode to the detection circuitry.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: May 24, 2005
    Assignee: Dura Global Technologies, Inc.
    Inventors: Yousheng Shen, Franco Consadori
  • Patent number: 6837987
    Abstract: A method and apparatus for detecting the presence of carbon monoxide in a gas which may also contain contaminating substances uses a pre-treatment means to absorb contaminating substances and to convert them to non-contaminating substances.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: January 4, 2005
    Assignee: Dart Sensors Limited
    Inventor: Walter John King
  • Patent number: 6808619
    Abstract: In an electrode system, particularly for electrochemical sensors, which comprises a working electrode, a counterelectrode and an electrolyte, the counterelectrode is constituted by a material containing an elementary carbon, whereby the long-term stability of the electrode system is considerably increased (FIG. 2).
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: October 26, 2004
    Assignee: Roche Diagnostics Operations, Inc.
    Inventor: Helmut Offenbacher
  • Patent number: 6761817
    Abstract: A method and system for determining dissolved oxygen is disclosed. One or more constant currents are driven through amperometric-type dissolved oxygen probes to develop reference electrode potentials defining the envelope of oxygen electrochemistry. The reference electrode voltage is generally measured at a first current level and at a second current level utilizing the oxygen probe, wherein the first and second current levels define limitations of oxygen electrochemistry. An optimum electrode bias voltage can thereafter be automatically calculated based the reference electrode voltage measured at the first current level and the second level to thereby provide accurate indications of dissolved oxygen thereof.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: July 13, 2004
    Assignee: Honeywell International Inc.
    Inventor: James G. Connery
  • Patent number: 6758962
    Abstract: Oxygen concentration measurement is carried out over a broad range by an instrument utilizing a zinc-air cell having a lower-than-nominal potential difference imposed across its electrodes by a shunt branch incorporating the source-drain circuit of a field effect transistor (FET). A feedback circuit is used to improve linearity of the output and cell life without sacrificing the broad dynamic range achieved by the use of the FET shunt branch.
    Type: Grant
    Filed: September 20, 2000
    Date of Patent: July 6, 2004
    Assignee: Doxs Technology Systems, Inc.
    Inventors: Matthew S. Fitzgerald, Edward C. Berdich, Peter M. Draper
  • Patent number: 6723216
    Abstract: A method for detection of a bubble in a liquid which is placed in a measuring chamber and is in contact with a sensor for measuring the partial pressure of a particular gas in a liquid is provided. The method includes performing a first measurement of the partial pressure of the particular gas in the liquid at a first pressure in the measuring chamber. Next, the pressure in the measuring chamber is changed to a second pressure. A second measurement of the partial pressure of the gas in the liquid at the second pressure in the measuring chamber is performed. An expected result of the second measurement based on the first measurement and assuming that no bubbles are present in the measuring chamber during any of the measurements is provided. The actual result of the second measurement is compared with the expected result and a conclusion is drawn on the presence of a gas bubble in the liquid based on the comparison. An apparatus for measuring the content of a particular gas in a liquid is also provided.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: April 20, 2004
    Assignee: Radiometer Medical A/S
    Inventors: Michael Taagaard, Allan Larsen
  • Patent number: 6663756
    Abstract: Disclosed is a microchip-based differential-type potentiometric oxygen gas sensor, which comprises a working electrode and a reference electrode. The working electrode is composed of a cobalt-plated electrode, a buffered hydrogel, and an ion sensitive gas permeable membrane while the reference electrode is composed of an oxygen non-sensitive silver chloride electrode and the same ion-selective gas-permeable membrane of working electrode. By taking advantage of the corrosion potential, the microchip-based oxygen gas sensor can accurately and quickly detect the content of dissolved oxygen in a sample solution. With this structure, the oxygen gas sensor is applied to a microchip-based all potentiometric multi-sensor capable of detecting two or more ions and gas species on a single chip.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: December 16, 2003
    Assignee: i-Sens Inc.
    Inventors: Dong Kwon Lee, Tae Young Kang, Sung Hyuk Choi, Jae Seon Lee, Hakhyun Nam, Geun Sig Cha
  • Patent number: 6652722
    Abstract: Sensor for measuring the partial pressure of a gas in a gaseous medium, includes an electrochemical cell and a diffusion barrier with a porous membrane situated above an orifice made in a component surmounting a casing enclosing said electrochemical cell.
    Type: Grant
    Filed: July 5, 2001
    Date of Patent: November 25, 2003
    Assignee: Oldham
    Inventors: Malcolm Taylor, Lionel Félix Witrant, Jean-Marie Beaumont, Daniel Lucien Gaston Chevalier
  • Publication number: 20030201193
    Abstract: A method of adjusting an output of a gas sensor element is provided. The gas sensor element includes a lamination of a solid electrolyte body, a target gas-exposed electrode, a reference gas-exposed electrode, and a diffused resistance layer in which a target gas to be measured diffuses. The target gas-exposed electrode is disposed on a first surface of the solid electrolyte body exposed to the target gas. The reference gas-exposed electrode is disposed on a second surface of the solid electrolyte body exposed to a reference gas. The diffused resistance layer is disposed on the first surface of the solid electrolyte body. The target gas-exposed electrode and the reference gas-exposed electrode produce a sensor output. The adjustment of the sensor output is achieved by decreasing a diffusion length of the target gas in the diffused resistance layer as a function of a quantity of the sensor output to be adjusted by, for example, removing a portion of the diffused resistance layer.
    Type: Application
    Filed: April 11, 2003
    Publication date: October 30, 2003
    Applicant: DENSO CORPORATION
    Inventors: Keigo Moriguchi, Makoto Nakae
  • Publication number: 20030178304
    Abstract: A carbon dioxide sensor and a method of detecting carbon dioxide using the sensor are provided, the sensor includes a closed chamber having as a wall portion thereof a substantially watertight, carbon dioxide-permeable membrane, two electrodes disposed in the chamber, and a film of substantially electrolyte-free liquid disposed in the chamber capable of simultaneously contacting the membrane and both of the electrodes.
    Type: Application
    Filed: February 3, 2003
    Publication date: September 25, 2003
    Inventors: Tor Inge Tonnessen, Peyman Mirtaheri
  • Patent number: 6623619
    Abstract: Electrochemical sensor for determining analyte in the presence of interferent, particularly carbon monoxide in the presence of hydrogen. An electrochemical cell is designed so that current flow resulting from reference electrode potential shift caused by interferent cancels out the current flow caused by interferent at the working electrode. Another electrochemical cell corrects for interferent concentration using the potential difference between a reference electrode in contact with interferent and a referent electrode not affected by inteferent.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: September 23, 2003
    Assignee: Alphasense Limited
    Inventors: John R Saffell, Michael L Hitchman, Darryl H Dawson
  • Publication number: 20030164311
    Abstract: An electrochemical cell that receives an inlet stream of air and produces an outlet stream of a high oxygen concentration of gas. The cell is made up of a plurality of layers and preferably a porous electrolyte comprised of yttria stabilized zirconia (YSZ) that allows only oxygen ions to pass therethrough and which is covered on its sides with electrodes comprised of lanthanum strontium manganate (LSM) which in turn are coated with a layer of platinum to aid in the even distribution of the electrical current. An electrical current is passed through the electrodes to produce a voltage difference therebetween. The layers of YSZ and LSM are formed by a sol-gel process.
    Type: Application
    Filed: January 16, 2003
    Publication date: September 4, 2003
    Inventors: Ravi R. Chandran, Lisa Klein, Sandra Mege
  • Patent number: 6602401
    Abstract: A dissolved oxygen sensor having a cathode and anode immersed in an electrolyte is designed to provide a low background current in the sensor when a potential is applied to the cathode. The background current is maintained at a desired level by selecting the area and length of a channel or path of diffusion of residual oxygen in the electrolyte to the cathode. The area (A) of the diffusion channel in relation to its length (L) is selected to be at or below a selected ratio, A/L.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: August 5, 2003
    Assignee: Rosemount Analytical Inc.
    Inventor: Chang-Dong Feng
  • Patent number: 6592746
    Abstract: A sensor probe is disclosed which can measure the hydrogen peroxide content of a single sample using two oxygen sensors whose electrodes are encased in defined membranes. The oxygen reference sensor is encased in a hydrophobic membrane which prevents the transport of hydrogen peroxide or electrochemical poisons or interferents and isolates the electrodes and an electrolyte fluid surrounding the electrodes from the sample fluid. The hydrogen-peroxide-generated oxygen (HPGO) sensor is also is encased in such a hydrophobic membrane, but has in series with and distally of the hydrophobic membrane a hydrophilic membrane which contains an immobilized enzyme such as catalase, peroxidase or other enzymes of a family which catalyzes the reaction of hydrogen peroxide to oxygen and water. At the HPGO sensor, the hydrogen peroxide is catalyzed to oxygen by the enzyme so that the HPGO sensor measures an enhanced concentration of oxygen relative to the oxygen reference sensor.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: July 15, 2003
    Assignee: The Regents of the University of California
    Inventors: Geert W. Schmid-Schoenbein, Dale A. Baker, David Gough
  • Publication number: 20030111358
    Abstract: A method and system for determining dissolved oxygen is disclosed. One or more constant currents are driven through amperometric-type dissolved oxygen probes to develop reference electrode potentials defining the envelope of oxygen electrochemistry. The reference electrode voltage is generally measured at a first current level and at a second current level utilizing the oxygen probe, wherein the first and second current levels define limitations of oxygen electrochemistry. An optimum electrode bias voltage can thereafter be automatically calculated based the reference electrode voltage measured at the first current level and the second level to thereby provide accurate indications of dissolved oxygen thereof.
    Type: Application
    Filed: December 19, 2001
    Publication date: June 19, 2003
    Inventor: James G. Connery
  • Publication number: 20020166776
    Abstract: The invention relates to an electrochemical gas sensor with a working electrode, which is designed as a thin-film electrode, and at least one counterelectrode, which are in electrical contact via an electrolyte. The electrochemical gas sensor is characterized in that the electrolyte is alkaline and preferably comprises a solution of a salt of a weak acid. The electrochemical gas sensor according to the invention may preferably be used to determine the oxygen concentration in a gas mixture.
    Type: Application
    Filed: May 10, 2001
    Publication date: November 14, 2002
    Inventors: Axel Fikus, Bernd Lindner
  • Patent number: 6454923
    Abstract: A gas sensor is described which is particularly well suited as a carbon monoxide (CO) sensor in a self test gas sensor. The sensor includes a number of aspects which may or may not be used in conjunction with one another. A first aspect is an embodiment which reduces electrical interference (or cross-talk) between a test or gas generating cell and a sensing cell. In one embodiment, baffles are provided to prevent cross-talk. In another embodiment a switching circuit ensures that a test gas generator is operational only when the gas sensor is disconnected from a current source. A second aspect is an embodiment which includes an improved wick which is in close proximity with an electrode and ensures electrolyte is always in contact with the electrode. In an alternate embodiment a solid polymer electrolyte is used between the electrodes. A third aspect is an improved catalyst which reduces the reaction energy and thereby renders the sensor more sensitive. The catalyst is also cheaper than platinum.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: September 24, 2002
    Assignee: Central Research Laboratories Limited
    Inventors: John Dodgson, John Edward Andrew Shaw, Malcolm Austen, Monica Backes
  • Patent number: 6435003
    Abstract: A method for identifying an unknown gas using a diffusion limited sensor providing an electrical signal output when exposed to the gas. According to the method, a sensor is disposed in a chamber of fixed volume and having a gas input and gas output through which the gas flows, and the chamber is connected to a source of a known test gas of known concentration and known diffusion coefficient Dk. The input to the chamber is opened, causing the sensor to be exposed to the known test gas until a steady state electrical signal output from the sensor is obtained. The time Tk necessary for the sensor to attain a predetermined percentage of the steady state output is determined. The chamber is then connected to a source of unknown gas, and the input is opened, and time Tu necessary for the sensor to attain the predetermined percentage of a steady state output for the unknown gas is determined.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: August 20, 2002
    Assignee: Industrial Scientific Corporation
    Inventor: P. Richard Warburton
  • Patent number: 6436258
    Abstract: A galvanic-cell gas sensor includes casings containing a diaphragm permitting the permeation of gas to be detected but having a water-repelling property, a cathode provided on the back side of the diaphragm, an anode formed by electrolytically coating a layer of lead (Pb) on an electrically conductive material having a corrosion resistance to electrolyte so as to leave a portion thereof uncoated to serve as a lead, and a sheet impregnated with electrolyte before assembly and disposed between the cathode and anode, with the diaphragm positioned so as to be exposed to the atmosphere.
    Type: Grant
    Filed: October 23, 2000
    Date of Patent: August 20, 2002
    Assignee: Riken Keikico., Ltd.
    Inventor: Shoichi Uchikoshi
  • Patent number: 6428665
    Abstract: An electrochemical gas sensor has a first gas diffusion electrode for a first reaction gas, which is inactive with respect to a second reaction gas at least in a first potential window, and a second gas diffusion electrode for the second reaction gas, which is active with respect to the second reaction gas at least in a second potential window for measuring two different gases in gas mixtures in a casing. The two gas diffusion electrodes are electronically isolated from one another, but electrically connected electrolytically to a reversibly loadable electrode and have contacts for connecting external closing circuits for adjusting the cell currents. The gas mixture is fed to the gas diffusion electrodes in series or parallel. The casing containing the electrodes is, in particular, in the form of a button cell. The reversibly loadable electrode is a Cu/CuO, Zn/ZnO or hydrogen electrode. The gas diffusion electrodes have a porous structure based on carbon or have a porous silver structure.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: August 6, 2002
    Assignee: Varta Geratebatterie GmbH
    Inventors: Dejan Ilic, Konrad Holl, Joachim Helmke, Hans-Joachim Kohnke, August Winsel
  • Publication number: 20020033334
    Abstract: An electrochemical gas sensor has at least one measuring electrode (5), a reference electrode (11) and an auxiliary electrode (7) in an electrolyte (3) and a diffusion membrane. The diffusion membrane (4) is formed from a polymer (Teflon® AF) containing bis-2,2-trifluoromethyl-4,5-difluoro-1,3-dioxol. The diffusion membrane (4) faces the ambient atmosphere.
    Type: Application
    Filed: July 18, 2001
    Publication date: March 21, 2002
    Inventors: Peter Tschuncky, Frank Mett, Herbert Kiesele
  • Publication number: 20020027086
    Abstract: Electrochemical sensor for determining analyte in the presence of interferent, particularly carbon monoxide in the presence of hydrogen. An electrochemical cell is designed so that current flow resulting from reference electrode potential shift caused by interferent cancels out the current flow caused by interferent at the working electrode. Another electrochemical cell corrects for interferent concentration using the potential difference between a reference electrode in contact with interferent and a referent electrode not affected by inteferent.
    Type: Application
    Filed: May 14, 2001
    Publication date: March 7, 2002
    Inventors: John R. Saffell, Michael L. Hitchman, Darryl H. Dawson