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4579631 Measurement of oxygen concentration  
A system is disclosed for measuring the oxygen concentration in a fluid contained in a fermentation vessel, comprising a fermentation vessel containing a nozzle aperture disposed in the wall...
4578154 Method and apparatus for measuring dissolved gas concentrations  
Two dissolved gas components in sample water, for example, oxygen and hydrogen in core water, are readily quantitatively determined in one and same membrane-type oxygen meter by using a membrane...
4571292 Apparatus for electrochemical measurements  
A sensor for an electrochemically active species, such as oxygen, uses more than two electrodes, namely, at least a working electrode, counter electrode and reference electrode. The sensor...
4568445 Electrode system for an electro-chemical sensor for measuring vapor concentrations  
An electrode system for an electrochemical sensor has a plurality of electrically conductive sensing segments isolated from each other and mounted on a support substrate formed from a chemically...
4563249 Electroanalytical method and sensor for hydrogen determination  
A method of and a sensor for quantitative electroanalytical determination of elemental hydrogen in a fluid medium are disclosed. A membrane enclosed amperometric cell is used that has at least two...
4561962 Ion-selective electrode and procedure for manufacturing same  
The invention concerns an ion-selective electrode comprising a polymer membrane, and its manufacturing procedure. Selectivity of the electrode to a given ion has been achieved in that the membrane...
4556472 Computerized device for pulsed potential voltammetric measurement of oxygen using a membrance covered polarographic electrode  
An oxygen analyzer which measures the level of dissolved oxygen in a liquid stream. The measuring process embodies chronoamperoemetry of pulsed potential voltammetry. The signal from the electrode...
4552840 Enzyme electrode and method for dextran analysis  
A method for the potentiometric determination of a dextran solution is provided wherein the dextran is enzymatically hydrolyzed to glucose, the glucose is oxidized to form hydrogen peroxide and...
4547280 Maltose sensor  
In a method for assaying maltose to quantitatively determine amylase, which comprises an enzyme membrane having immobilized α-glucosidase and glucose oxidase, the present invention is an...
4545863 Automated membrane test cell apparatus and method for so using  
Disclosed is an automated electrolytic membrane test cell apparatus adaptable for the purpose of accurately measuring the electrolytic properties of membranes used in chlor-alkali cells under...
4541901 Method and apparatus for zero calibration of oxygen-sensing polarographic devices  
The calibration of a polarographic oxygen sensor (20) at zero oxygen concentration is accomplished by providing an oxygen-free liquid environment at the sensor active surface. This is accomplished...
4539092 Plasma oxygen permeability meter  
A polarographic oxygen detection cell of the type having concentric coplanar electrodes. The cell achieves more consistent and predictable operation by using electrode insulators to prevent...
4535778 Method and apparatus for detecting blood gas  
A blood gas detector for human use has a support fitting into the mouth between the sides of the upper and lower jaws and the inside of the cheek and carries electric conductors for connection to...
4536274 pH and CO2 sensing device and method of making the same  
A transcutaneous blood carbon dioxide sensor together with a method for making such a sensor and for making electrodes used in the sensor. The sensor comprises a palladium/palladium oxide junction...
4534355 Electrochemical sensor employing a gas-permeable hydrophilic polyurethane membrane  
A device for use in determining blood gas which employs a membrane of material permeable to blood gas to be determined characterized in that the membrane is hydrophilic polyurethane is described.
4534356 Solid state transcutaneous blood gas sensors  
Disclosed is a solid state oxygen sensor utilizing a noble metal first electrode and a silver/silver halide reference electrode and an oxygen permeable polymeric membrane electrolyte. Also...
4533456 Oxygen sensor for rapid blood gas analysis  
In systems for rapid sequential analysis of fluid samples, such as blood samples, an electrochemical sensor is capable of equally rapid, sequential sample response by avoiding the need for...
4529495 Measuring set-up with at least one sensor  
Between a substance to be analyzed and a sensor there is placed at least one membrane, forming part of a sample vessel containing a sample to be analyzed and being permeable for a species...
4527626 Process and apparatus for removing dissolved oxygen  
Saline source water containing dissolved oxygen is deoxygenated to form injection quality water in the disclosed process and apparatus. In accordance with the invention, saline source water is...
4525265 Electrochemical sensor capable of determining hydrogen peroxide concentration and analyzer using the same  
A urea-determining sensor and a glucose-determining sensor are arranged to face a single passage through which a sample flows. The urea sensor combines a membrane of immobilized urease with an...
4525704 Enzymatic toxic gas sensor  
An enzymatic toxic gas sensor 10 having a plurality of parallel planar surfaces and a buffered electrolyte reservoir 44. The buffered electrolyte is conveyed by means of diffusion to a substrate...
4522690 Electrochemical sensing of carbon monoxide  
Apparatus and method for an electrochemical sensor for carbon monoxide detection in a gelled aprotic organic nonaqueous electrolyte solution.
4521290 Thin layer electrochemical cell for rapid detection of toxic chemicals  
A thin-layer electrochemical cell for rapid detection of toxic chemicals and chemical agents having a large area thin-film sensing electrode in contact with a very thin layer of nonaqueous aprotic...
4518477 Thermal protection for electroanalytical cell and amperometric probe  
A method of thermal protection of a membrane-enclosed amperometric cell of the type comprising an electrolyte within an electrolyte space containing electrodes and enclosed by a semipermeable...
4514276 Microelectronic sensor assembly  
A microelectronic semiconductor element 12 is mounted on to a header 13, and integrally combined with one or more metallic sensing electrodes 20, 21 by encapsulation in a chemically and...
4505784 Method for urea analysis  
For determining the urea concentration in liquids in continuous operation, with high sensitivity and reliable determination of the urea content over an extended period of time, an electrode which...
4499901 Retreated sensing electrode  
An improved sensing electrode assembly for testing for a constituent in blood is provided. An electrode assembly exhibits a decreased time to reach stable operation by virtue of having the...
4500391 Method of and system for real time differential pulse detection  
An electrochemical detection cell which includes, in the order named, a stack of components constituted by a first membrane, an electrode carrier having reference and counter electrodes thereon, a...
4498970 Electrochemical gas sensor  
An electrochemical gas sensor having a relatively small sensing electrode (12) formed from powdered metal pressed onto a relatively thick porous sheet (24) of polytetrafluoroethylene (PTFE),...
4498049 Radiation compensator for gas sensors  
A compensator device for providing direct and automatic correction of electrolytic gas sensor performance anomalies caused by exposure of the sensor to high levels of ionizing radiation. The...
4495051 Galvanic cell type oxygen sensor  
A galvanic cell type oxygen sensor comprising a galvanic cell comprised of a cathode made up of metal effective for the electrolytic reduction of oxygen, an anode made up of lead material and an...
4492622 Clark cell with hydrophylic polymer layer  
An electro-chemical cell for determining a particular property or component of a fluid includes a cathode electrode, an anode electrode spaced from the cathode, an electrolyte filling a space...
4490234 Method for measuring ionic concentration utilizing an ion-sensing electrode  
A method for measuring the concentration of a gas. The method includes circulating an electrolyte solution between an electrode and a gas-permeable, ion-impermeable membrane spaced from said...
4486291 Measuring apparatus for the determination of oxygen partial pressure in fluids and gases  
There is provided a measuring apparatus for determination of oxygen partial pressure in liquids and gases which comprises a substantially sheathed metallic cathode having a small, unsheathed...
4479865 Electrode assembly  
A replaceable cap assembly for use with an electrochemical analysis electrode that includes an electrode body and an ion selective portion at an end of the body comprises a housing component for...
4474183 Gas sensor  
A gas sensor with its photosensitivity allayed in which a hydrogen ion sensitive FET transducer having the structure of a gate-insulated field effect transistor and an Ag-AgCl reference electrode...
4473456 Conductimetric gas sensor  
A conductimetric gas sensor consists of a ptfe body forming an electrolytic cell; two threaded silver electrodes screwed into the ptfe body and bridged by a layer of a hydrophilic gel in contact...
4472261 Dissolved oxygen gas measuring electrode system  
An electrode system for measuring oxygen gas in a solution comprises a pair of electrodes consisting of an indicator electrode and a reference electrode immersed in an electrolyte solution and a...
4469562 Carbon dioxide sensor  
An electrolyte anion exchange sensor having a first diffusion membrane is spaced apart from an anion exchange membrane to form a cathodic cell. A second diffusion membrane is spaced apart from the...
4466879 Polarographic oxygen sensor  
A polarographic sensor for blood oxygen monitoring is defined by respective anode and cathode electrode wires fixedly maintained in conventional fashion. The end cross sections of the wires are...
4466878 Electrochemical electrode assembly  
A replaceable cartridge assembly for use with electrochemical analysis apparatus includes a housing of electrically insulating material that defines an annular electrolyte chamber with coupling...
4464230 Method of measuring oxygen using a membrane covered polarographic electrode  
An oxygen analyzer which measures the level of dissolved oxygen in a liquid stream. The measuring process embodies chronoamperoemetry of pulsed potential voltammetry. The signal from the electrode...
4463593 Apparatus for monitoring the partial pressure of gases  
An apparatus is disclosed for monitoring the partial pressure of a gas in the liquid flowing in a line, for example the PO2 or PCO2 tension in blood. The apparatus comprises a connector adapted...
4460451 Steam-sterilizable carbon dioxide sensor  
A carbon dioxide sensor for measuring dissolved carbon dioxide or carbon dioxide in gas is sterilizable with steam under pressure at a temperature of 120-130 degrees Celsius. The sensor comprises...
4459357 Process and apparatus for the quantitative determination of cations or anions by ion chromatography  
A procedure and an apparatus for the quantitative determination of cations and anions by ion chromatography is described which can be used, for example, to test drinking water, river water or...
4459199 Ruggedized ion-responsive electrode and its manufacturing process  
An ion-sensitive electrode, usable for measuring the activity or concentration of a predetermined ion in a fluid stream of an industrial process, includes a vessel partially filled with an...
4459180 Method and means for compensating for IR voltage drop in electrochemical cells  
Apparatus for compensating for the IR drop in a polarographic type electrochemical cell which utilizes an injected current for in situ calibration includes means operable for a brief period of the...
4455213 Pressure equalization system for membrane type amperometric sensors  
A membrane type amperometric gas sensor is provided with a pressure equalization passage between the exterior and interior of the cell in which the electrodes are located. Cell fluids move into...
4452672 Process and apparatus for polarographic determination of oxygen and carbon dioxide  
The determination of the concentration of compounds such as CO2 having an influence on the pH of a medium during polarography is described. Characteristics of polarograms when obtained in...
4452682 Apparatus for measuring clinical emergency check items of blood  
An apparatus for electrochemically measuring clinical emergency check items of blood for a short time by flowthrough system, using a small amount of whole blood as a blood sample, which comprises...