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4242303 |
Gas detecting element
A gas detecting element having a high gas selectivity which comprises an N-type metal oxide semiconductor, 0.005 to 8% by weight, based on the metal oxide, of at least one noble metal catalyst...
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4242302 |
Method of making a catalytic combustion type gas detector
A method is described of making a catalytic combustion type gas detector, the sensitivity of which to alcohol vapors and to tobacco fumes is decreased by utilizing a mixture of powders. The mixed...
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4240799 |
Sensing the presence of ozone
A means for detecting and/or measuring the presence of ozone in an atmosphere such as air. A solid state sensor that is capable of changing its conductivity in the presence of ozone is located...
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4237722 |
Exhaust gas sensor electrode improvement
An improved exhaust gas sensor for use in sensing the partial pressure of oxygen in the exhaust gases from an internal combustion engine. The sensor has a titania ceramic element in which two...
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4236307 |
Method of making a nitrogen dioxide sensing element
A method of making an element for sensing the presence of nitrogen dioxide gas in the environment. The element is formed by heating a film of an electrically non-conductive polyaromatic polymer to...
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4235097 |
Dosimeter for measuring gaseous contaminants
A personal dosimeter for measuring the time-average concentration of a gaseous contaminant in the atmosphere in a manner substantially independent of atmospheric motion relative to the dosimeter is...
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4235096 |
Gas detection apparatus
A gas detection apparatus with a gas detection element of which the electric resistance changes in accordance with a gas constituent, especially oxygen, in exhaust gas, wherein a fixed voltage is...
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4233033 |
Method and apparatus for measuring the O.sub.2 content of a gas
A method and apparatus for obtaining an electrical signal which is a function of the 0 2 content of the exhaust gas of an internal combustion engine. Two resistors (1 and 3) are exposed to the...
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4225842 |
Resistance type oxygen sensor
A temperature compensated oxygen sensor has a generally cylindrical first insulator with an axial bore extending therethrough which is counterbored at one end. A second cylindrical insulator is...
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4224280 |
Carbon monoxide detecting device
A carbon monoxide detecting device which exhibits a stepwise change in film current over a preselected range in carbon monoxide concentration is disclosed. According to the present invention, in...
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4224595 |
Graded particle adsorption type sensor and method of improving performance of an adsorbing sensor
An adsorbing type sensor of the type having electrically conductive adsorbent particles resiliently embedded in a surface and forming an electrical conductive path through the sensor, the...
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4223293 |
Terminal pin arrangement for an exhaust gas sensor
An improved exhaust gas oxygen sensor of the type adapted for installation in the exhaust conduit of an internal combustion engine. The improved sensor preferably uses a titania metal oxide ceramic...
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4221827 |
Method of manufacturing a gas sensor
A system for detecting carbon monoxide, even in the presence of methane, using a catalytic sensor material having a perovskite crystal structure and a composition A 1 -n B n CO 3 -m where A is a...
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4214472 |
Exhaust gas oxygen sensor and electrical connector arrangement
An exhaust gas oxygen sensor and electrical connector arrangement for use in connecting the sensor to an electronic device capable of utilizing an electrical signal produced by the sensor. The...
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4206173 |
Gas composition sensor
A gas composition sensor for sensing the air-fuel ratio of the exhaust gases from an automobile. The gas composition sensor includes a gas composition sensing element composed of a sintered metal...
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4205043 |
Hazardous atmosphere badge
An inexpensive badge for detection of dangerous gases wherein a plurality of paper discs impregnated with a color sensitive gas indicator chemical are mounted in alignment with apertures in a...
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4203946 |
Ozone detecting element
A detecting element for sensing the presence of higher than normal concentrations of ozone in air at ambient temperatures and pressures. The element is formed of a "lower" oxide of a semiconductor...
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4200608 |
Detector for fumes of hydrazine and its derivatives
Disclosed is a detector for fumes of hydrazine and its derivatives, methydrazine (MMH) and 1,1-dimethylhydrazine (UDMH). The detector encompasses a means for generating heat when fumes of hydrazine...
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4196427 |
Method and apparatus for measuring low concentrations of chlorine and chlorine oxide
A semiconductor sensor element having two filaments of a noble metal, preferably platinum, embedded in spaced apart relation in a body of titanium oxide. One of the filaments serves as a sensing...
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4193965 |
Circuit assembly for exhaust emission monitoring
A device for monitoring the composition of the exhaust emission of a combustion process includes a hollow elongated body open at one end thereof and an elongated substrate located in the body and...
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4187486 |
Oxygen concentration detecting element and method of producing the same
This invention provides an oxygen concentration detecting element and method of producing the same for use in detecting the oxygen concentration of gases such as exhaust gases from gasoline...
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4177445 |
Contactless switching element for electric current
A contactless switch element for electric currents, which is constructed as a hydrogen-diffusion-impervious but electrically non-conductive, encapsulated metal adapted to be reversibly hydrogenated...
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4172247 |
Gas concentration sensing device
A gas concentration sensing device has a plate type sensing element which is equipped with first and second electrodes which are exposed to first and second gases, respectively. A chamber is formed...
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4158610 |
Method and apparatus for determining and controlling amount of carbon deposited on a surface by a gas
The amount of solid carbon deposited on a surface by a gas during the coking cycle in a coke oven is determined by measuring the thickness by electrical resistance readings, as a function of time,...
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4147515 |
Electro-chemical sensors for gas detection in electron tubes
An electro-chemical gas sensor for use in electron tubes comprising a crylline body of BaO formed on a non-interacting (chemically and electrically) substrate and at least two electrodes. The...
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4147513 |
Method and apparatus for measuring the O.sub.2 content of a gas
A method and apparatus for measuring the O 2 content in an exhaust gas of an internal combustion engine by exposing two resistors to the exhaust gas of an internal combustion engine. The...
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4146887 |
Respirator cartridge end-of-service life indicator
A gas or vapor sensing and alarm device in an air purifying respirator for warning the wearer of hazardous levels of gases or vapors penetrating through the respirator cartridge. An exothermic...
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4142400 |
Nitrogen dioxide sensing element and method of sensing the presence of nitrogen dioxide
An element for sensing the presence of nitrogen dioxide gas in the environment. The element comprises a film of a pyrolyzed polyaromatic polymer having semi-conductive properties which is mounted...
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4138881 |
Resistor-type solid electrolyte oxygen sensor
An oxygen sensor consisting of an oxygen ion conductive solid electrolyte member coated with a porous cermet structure which exhibits a metallic and ceramic skeleton develops a resistance change in...
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4130797 |
Gas component sensing apparatus
In a gas component sensing apparatus a pair of thin film electrodes are arranged on opposite sides of a gas component sensor element, an electrical resistance of which varies in accordance with gas...
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4125822 |
Probe for determining organic liquids
The presence of an organic liquid is detected by means of a probe which comprises a rubber-like material which is swellable in an organic liquid, which rubber-like material has...
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4086556 |
Humidity sensitive ceramic resistor
There is provided a humidity sensitive ceramic resistor having high humidity activity, low electrical resistance, quick response rate to humidity and high stability with respect to time,...
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4077775 |
Element for detecting the presence of combustible gases in a gaseous atmosphere
Element for detecting the presence of combustible gases in a gaseous atmosphere containing at least one oxidizing agent, comprising a microporous support consisting essentially of a mixture of...
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4067695 |
Gas sensing element
A gas sensing element which varies its resistivity upon the adsorption of gas and which has a sintered body including an oxyacid salt semiconductor and which may also contain carbon.
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4068021 |
Method of making gas analyzing element
A catalytic combustion-type, gas sensing, resistive element and the method of making it by forming an electrical conductor, whose electrical resistance varies with temperature, into a helical coil,...
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4066413 |
Gas component detection apparatus
A gas component detection apparatus for detecting gas components contained in an exhaust gas from a combustion device and determining an air-fuel ratio of an air-fuel mixture supplied thereto. A...
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4057996 |
Systems for monitoring the composition of exhaust gases
In a system for monitoring the composition of exhaust gases from an internal combustion engine, a gas-sensitive resistor consisting of gallium oxide is exposed to the gases and is maintained at a...
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4058368 |
Hydrogen detector
A device for the detection of hydrogen comprising a semiconductor, a metal electrode and an insulator situated between the semiconductor and the electrode. The metal electrode is made of palladium,...
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4045764 |
Gas-sensing material
A gas-sensing material for detecting the presence particularly of hydrocarbon gases which is characterized by being formed of a sinter containing 20 to 99.85 mol % of ZnO, 0.1 to 50 mol % of MgO...
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4044601 |
Smoke and gas sensor element
A sensor element for detecting smoke and/or reducing gases, which comprises a shaped body formed from a material consisting essentially of: A. a complex metal oxide having a perovskite type crystal...
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4045177 |
Apparatus for detecting combustible gases
This is an improvement in apparatus for detecting combustible gases, such as methane, that embodies a Wheatstone bridge circuit including a refractory-coated reference element constituting one leg...
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4039941 |
Gas sensor
A gas sensor is provided here comprising a semi-conductor support coated with a material which reacts with a specific gas as a result of which it exchanges electrons with the support. By measuring...
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4033169 |
Hydrocarbon concentration sensor for use in engine exhaust gas
A sensor having an n-type oxide semiconductor layer and a p-type oxide semiconductor layer spaced from and electrically connected in series with each other and two fixed resistors connected in...
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4030340 |
Hydrogen gas detector
A semiconductor article suitable for use in the detection of hydrogen gas in the atmosphere. The article comprises a film of palladium deposited onto a semiconductor film of stannic oxide which is...
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4017792 |
Device for determining and/or measuring alcohol content in a gas and method of manufacturing a semi-conductor body for use in alcohol detection
A sensor for determining and/or measuring alcohol which exhibits an electric conductivity which varies with the alcohol concentration, comprises a heater with a metallic-oxide semi-conductor body...
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4016524 |
Sensor for a gas detector, in particular for smoke detection
Sensor for selectively detecting at least one constituent of a gaseous mixture in contact with the sensor. The sensor comprises a thin layer of a semiconductor material covered with a dielectric...
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4013943 |
Solid state electrolytic cell gas sensor head
A Solid State Electrolytic Cell Gas Sensor is presented which is capable of measuring various toxic or combustible gases in low concentrations (0-5 PPM) up to and including high concentrations such...
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4012709 |
Cobalt-magnesium monoxide alloy ceramic partial pressure of oxygen sensor
A sensor responsive to the partial pressure of oxygen and suitable for inclusion in an internal combustion engine exhaust gas environment is disclosed. The sensor is comprised of a ceramic material...
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4007435 |
Sensor device and method of manufacturing same
An oxygen sensing device particularly suited as a sensor for the exhaust gases of internal combustion engines, the sensing device comprising an electrically insulative ceramic element having bonded...
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4004452 |
Air/fuel ratio sensor for air/fuel ratios in excess of stoichiometry
The present invention provides a sensor which is operative to sense the partial pressure of oxygen in the exhaust gases of combustion processes having air/fuel combustion mixture ratios in excess...
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