A gas measuring device (100) measures cyanogen in the presence of hydrogen cyanide. The gas measuring device (100) includes a measuring chamber (101), a heating element (103, 203) and an electrochemical sensor (105, 200). The measuring chamber (101) is configured to receive a sample. The heating element (103) is configured to thermally decompose cyanogen contained in the sample into decomposition products. The sensor (105, 200) is configured to detect the decomposition products of cyanogen, which are obtained by the thermal decomposition. A process measures cyanogen in the presence of hydrogen cyanide.

A system for detecting an analyte gas in an environment includes a first gas sensor, a first contaminant sensor separate and spaced from the first gas sensor, and electronic circuitry in electrical connection with the first gas sensor to determine if the analyte gas is present based on a response of the first gas sensor. The electronic circuitry is further in electrical connection with the first contaminant sensor to measure a response of the first contaminant sensor over time. The measured response of the first contaminant sensor varies with an amount of one or more contaminants to which the system has been exposed in the environment over time.

[Object] To provide a compact and reusable alkene-detection gas sensor that detects an alkene and a system using the same.

[Solving Means] An alkene-detection gas sensor that detects an alkene in a sample gas according to the present invention includes: a first reaction unit that contains a palladium catalyst and oxidizes an alkene in a sample gas to convert the alkene into an aldehyde and/or a ketone; a second reaction unit that contains hydroxylamine salts and reacts with the aldehyde and/or ketone converted in the first reaction unit to generate an acid; and a response unit that includes an electrode supporting a semiconductor material of which an electrical resistance value changes by the generated acid, in which the palladium catalyst, the hydroxylamine salts, and the semiconductor material are separated from each other.

A method for analyzing a gaseous pollutant by means of a microfluid circuit includes a means for pumping a liquid and a means for trapping a gas, comprising the following steps: a) generating a flow of a liquid, the liquid comprising a selective derivative agent; b) trapping and dissolving gaseous pollutant in the flow; c) reaction of the pollutant with the selective derivative agent so as to form a liquid derivative compound; d) measuring the concentration of liquid derivative compound and determining the concentration of gaseous pollutant.

An apparatus for semiconductor manufacturing includes an input port to receive a carrier, wherein the carrier includes a carrier body, a housing installed onto the carrier body, and a filter installed between the carrier body and the housing. The apparatus further includes a first robotic arm to uninstall the housing from the carrier and to reinstall the housing into the carrier; one or more second robotic arms to remove the filter from the carrier and to install a new filter into the carrier; and an output port to release the carrier to production.

An OH radical measurement device includes a contact unit configured to bring an OH radical detection probe into contact with a gas to be measured, the OH radical detection probe including an aromatic carboxylic acid or an aromatic carboxylic acid derivative, a polar aprotic organic solvent, and a polar protic organic solvent having a content higher than a content of the polar aprotic organic solvent.

The gas measurement device includes a catalyst member connected to a power source applying voltage or current, performing a reaction of a first gas and a second gas contained in a mixed gas contacted with the catalyst member to generate a third gas, and exhibiting a catalytic action in which the reaction changes in response to temperature, and a gas sensor configured to detect gas molecules contacted with the catalyst member.

In various embodiments, rapid, sensitive detection of molecular hydrogen is achieved by chemically converting hydrogen to water vapor and then detecting the water vapor as a surrogate for the hydrogen. Detection may be enhanced by dampening variation in ambient water vapor and rapidly actively modulating a hydrogen-derived water vapor component. For example, the detector may receive sample gas that includes ambient water vapor and hydrogen, dry the sample gas to dampen variation in the ambient water vapor, divide the sample gas into a chemical conversion flow and a bypass flow, chemically convert hydrogen in the chemical conversion flow to water vapor, alternate between measuring water vapor in the converted chemical conversion flow or the bypass flow to produce a water vapor signal, separate the water vapor signal in the time domain to extract a hydrogen-derived water vapor signal, and output a hydrogen signal based on the hydrogen-derived water vapor signal.

In various embodiments, rapid, sensitive detection of molecular hydrogen is achieved by in a detector that divides sample gas into two flows by dividing the sample gas before dampening variation and converting hydrogen to water vapor at two different points. For example, a detector may receive sample gas that includes ambient water vapor and hydrogen, divide the sample gas into a chemical conversion flow and bypass flow, perform a first chemical conversion of hydrogen in the chemical conversion flow to water vapor, alternate between drying the converted chemical conversion flow or the bypass flow to produce a modulated flow, perform a second chemical conversion of hydrogen in the modulated flow to water vapor, measure water vapor in the converted modulated flow to produce a water vapor signal, separate the water vapor signal in the time domain to extract a hydrogen-derived water vapor signal, and output a hydrogen signal based thereon.

In examples, there is a device for converting ammonia (NH.sub.3) in a human breath sample to nitric oxide (NO). The device comprises a tube and a heater. The tube comprises an inlet, an outlet, and a wall defining an internal surface of the tube and an external surface of the tube. The wall comprises substantially the same material along a thickness from the internal surface of the tube to the external surface of the tube. The material is catalytic for conversion of ammonia to nitric oxide. The heater is configured to heat the wall.