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5474660 Method and apparatus for determining the concentration of ammonium ions in solution  
An ammonia gas sensor 16 is housed within a container 14 partially immersed in a solution 2 containing ammonium ions. An electrochemical generator 6, 8, 10 generates hydroxyl ions in a region of...
5472590 Ion sensor  
An ion sensor having an ion selectivity, which comprises an internal electrode of metal/metal salt, composed of an electroconductive layer of at least one metal and a layer of an insoluble salt of...
5468366 Colloidal-gold electrosensor measuring device  
The present invention provides a new device for use in measuring lead levels in biological and environmental samples. Using square wave coulometry and colloidal gold particles impregnated on carbon...
5468374 Miniaturized sensor component for measuring concentrations of substances in liquids, and method of manufacturing such a component  
A miniaturized sensor component for measuring concentrations of substances in liquids comprises a support that contains cavities accommodating a membrane. The membrane is produced in situ by...
5462645 Dialysis electrode device  
A dialysis electrode device comprises a shank of needle-like proportions and formed from a hollow dialysis fiber membrane. The shank is closed at its distal end by a sealing plug and, at its...
5460710 Electro-analysis of liquids and sensing elements for use therein  
A sensing element, for use in determining the presence and/or concentration of a species in a solution, comprises a flat insulating substrate (10) having at least one thin metallic electrode (16)...
5443701 Electrobiochemical analytical method and electrodes  
An analytical method for determining the presence or concentration of an analyte in a liquid medium is provided in which electrons are transferred from an electrode material of an electrode to the...
5443706 Biocatalyst-immobilized electrode and method for treatment of water by use of the electrode  
An electrode consists of a cathode matrix material and a biocatalyst immobilized on the matrix material. A water under treatment is treated by disposing the electrode as a cathode and an anode...
5437973 Enzyme-electrode sensor  
A sensor of the enzyme-electrode type containing a layer of porous material of restricted permeability between the enzyme and a sample to be analysed. The porous material has a percentage porosity...
5431160 Miniature implantable refillable glucose sensor and material therefor  
A reusable, miniature, implantable electrochemical sensor, a method of making the same, and a powder therefor are provided. Enzyme material is immobilized on bulk particulate matter, and a reaction...
5431806 Oxygen electrode and temperature sensor  
A small oxygen electrode and a method of bonding a fluorine resin film are disclosed. This small oxygen electrode includes a flat electrode substrate having at least two electrodes (a working...
5425868 Sensor for non-invasive, in vivo determination of an analyte and blood flow  
The sensor (1) comprises a sensor body (3) thermostatable by means of a first thermostating system (14,15) and having an outer surface (3a,40a) for application to the human body (28) in heat...
5423963 Fouling compensation in an oxygen analyzer  
A level of a chemical in a fluid is accurately measured by an analyzer having an electrode assembly separated from the fluid by a membrane. The electrode assembly is energized to provide a steady...
5415760 Galvanic cell type gas concentration sensor system capable of detecting more than one type of gas  
A galvanic cell type gas sensor which utilizes the respective merits of galvanic cell type and polaro type gas sensors so that a plurality of gasses can be detected by one sensor. One working...
5405510 Portable analyte measuring system for multiple fluid samples  
A portable, ready-for-use analyte measuring device is provided for the measurement of multiple sequential fluid samples. The device has a disposable cartridge, a calibrating fluid external to the...
5403463 Electrochemical sensor  
An electrochemical sensor having at least two electrodes that communicate with a liquid measurement cell electrolyte and a housing that encloses the electrodes and the electrolyte. The surfaces of...
5401377 Ion-selective sensor with polymeric membrane having phospholipid dispersed therein  
An ion-selective electrode having an ion-selective membrane in direct contact with an electrical conductor is provided in which the membrane coats an uninsulated zone surrounded by insulation on...
5401376 Electrochemical sensors  
An electrochemical sensor having a substrate, conductive strips deposited on the substrate, and a layer insulating portions of the conductive strips except those portions which define a working...
5395507 Electrochemical gas sensor  
An electrochemical gas sensor comprises sensing and counter electrodes (1,2). A conduit (15) permits access of gas to the sensing electrode (1). An electrolyte reservoir (23). A porous, block-like...
5395503 Zero volume electrochemical cell  
Methods and apparatuses are described for determining the presence of an analyte in a sample suspected of containing the analyte. The method comprises contacting a concentrate of a determinable...
5393391 Electrode arrangement for the electrochemical analysis of electrolytic components of a liquid  
The present invention provides an electrode arrangement for the electrochemical analysis of components of a liquid, having a base body (7; 53; 85; 103; 139; 155; 175; 193), made of an insulating...
5393399 Amperometric measuring device having an electrochemical sensor  
An amperometric sensor device comprises in combination a sensor (21) having a planar structure obtained by photolithographic techniques and a circuit (22) for measuring the intensity of the...
5389217 Measurement of bladder oxygen  
An apparatus for the determination and continuous monitoring of bladder epithelial oxygen (pbO2) which comprises, in combination, an introductory catheter with an inflatable placement cuff and an...
5385659 Reference electrode  
A planar reference electrode for chemical sensors, which are able to be supplied with a measuring fluid and a calibrating fluid. The planar reference electrode has the following components: an...
5384029 Electrochemical membrane sensor  
An electrochemical membrane sensor 20 for immersion in a test fluid, such as wastewater, is used to sense desired chemical species, such as dissolved oxygen, within the test fluid. The sensor 20...
5378344 Ion sensor  
Disclosed is an ion sensor with its electrode covered with a water-repelling organic chemically adsorbed film, which is formed with at least one hole permitting the passage of ions and preventing...
5376251 Carbon micro-sensor electrode and method for preparing it  
A carbon micro-sensor electrode is disclosed which is prepared by impregnating, adsorbing or chemically modifying a pure composite carbon wire having many micropores extending to its surface and...
5376255 Gas sensor  
A planar gas sensor, in particular a pCO2 or pO2 sensor, has the following components: a pH sensor located on a flat substrate, or at least one noble metal electrode located on the substrate; a...
5372696 Electrochemical sensor of modular design  
An electrochemical sensor for fluid media with at least two electrodes, which are in contact with one another via an electrolyte and are accommodated in a housing. Many different sensor variants...
5358619 Oxygen electrode  
A small oxygen electrode and a method of bonding a fluorine resin film are disclosed. This small oxygen electrode includes a flat electrode substrate having at least two electrodes (a working...
5356792 Biochemical oxygen demand analyzer and methods of analysis using Klebsiella microorganisms  
The present invention relates to a BOD analyzer comprising a microbe sensor containing an oxygen electrode and a microbe membrane. The microbe membrane is made by immobilizing microorganisms...
5354448 Electrochemical sensor  
An electrochemical sensor for the determination of the partial pressure of oxygen in a bloodstream comprising a cathode and an anode immersed in an electrolyte contained in a chamber defined by an...
5352349 Method for reviving an electrode of a biosensor  
After a reverse bias is applied between a working electrode and a counter electrode or a reference electrode, a forward bias higher than a forward measurement bias is applied between the working...
5352348 Method of using enzyme electrode  
Disclosed is a method of assaying a high concentration of a substance in a liquid sample with a polarographic cell. The cell contains an electrode assembly that includes a reference electrode and a...
5352352 Carbonic acid gas sensor  
A sensor for detecting a carbonic acid gas dissolved in body fluids has a laminated structure including an outer plate having a carbonic acid gas permeable window, a plate for a pH-electrode having...
5350500 Electrokinetic potential measurement  
The measurement of electrokinetic potential is of importance in paper-making. A measuring cell (12) for a specific potential known as streaming potential of the kind disclosed in EP B1 0 079 726 is...
5348862 Method for the rapid determination of the microorganism content of liquids and fluid solutions, and apparatus for implementing this method  
Method for amperiometrically measuring the bacterial content of liquids in a bioelectrochemical cell wherein the mediator is initially oxidized in the cell, then brought into contact with a...
5346605 Apparatus for quantitative determination of chemical oxidizing or reducing agents in a fluid environment  
An apparatus for the quantitative determination of chlorine in a fluid environment, comprising a flat ion exchange membrane-based sensor which utilizes a layer of an electrochemically inert...
5346604 Self-activating chemical sensor system  
A gaseous oxygen electrochemical sensing system sustains inter-electrode ionic conductivity by the use of a combination of an hydrophilic coating layer on a gas-permeable barrier or separation...
5344545 Electrolytic sensor for measuring the content of gas in a fluid  
A gas sensor e.g. an oxygen sensor for testing body fluids, has a laminated structure with a cavity for holding a gel or liquid electrolyte in contact with a cathode and anodes formed by deposition...
5344546 Electrical measuring cell for determinging ammonia, amines, hydrazine amines, hydrazine and hydrazine derivatives  
The invention is directed to an electrochemical cell for measuring ammonia, amines, hydrazine and hydrazine derivatives and includes a measuring electrode in an electrolyte. The measuring electrode...
5342490 Electrolytic detection of sulfur  
A macrocyclic compound coated electrode may be used advantageously to detect and measure the concentration of sulfide in aqueous samples. The electrode is substantially unaffected by other...
5338430 Nanostructured electrode membranes  
A nanostructured composite film comprising a plurality of nanostructured elements, wherein the nanostructured elements are either two-component sub-microscopic structures comprised of whiskers...
5338429 Electrochemical toxic gas sensor  
A compact electrochemical gas sensor for detecting toxic gases is described which utilizes a fluted electrically-conducting feedthrough for making the electrical connection from outside the sensor...
5338435 Integrated circuit hydrated sensor apparatus  
A plastic covered nonconducting substrate with an electrical circuit means is secured to the extent to withstand the presence of liquids in contact with the substrate. The covered substrate can...
5336388 Analyte and pH measuring sensor assembly and method  
The sensor apparatus of the present invention includes on a nonconducting substrate electrically conductive pathways leading to at least two analyte electrodes and one reference electrode. The...
5336390 Electrochemical gas sensor with disk-shaped electrodes, which are also electrical contact leads  
An electrochemical gas sensor for detecting gaseous components in the environment has a diffusion membrane, a measuring electrode, a counterelectrode, and, if desired, a reference electrode,...
5326449 Composite membrane  
A sensor device for measuring the concentration of an analyte in solution is described. The device includes a composite membrane which incorporates a porous membrane containing an immobilized...
5326447 Oxygen analyzer  
An analyzer for detecting a selected chemical (such as oxygen) in a process fluid includes a plurality of electrodes that are separated from the fluid by a membrane that is permeable to the...
5324665 On-line method for monitoring chloride levels in a fluid stream  
A method for monitoring automatically, on-line chloride content in a fluid stream in an oil refinery. Additionally, the present invention provides a method for neutralizing the acids resulting from...