In order to be able to prevent analysis accuracy from being reduced by a backward flow of sample gas from dead volume in a cleaning mechanism into a cell at the time of analysis, a gas analysis device has an analysis part that analyzes the sample gas introduced into the cell, gas ports that are arranged toward predetermined regions of gas contact surfaces in the cell, and a piping mechanism that connects the gas ports to a predetermined purge gas source, and blows purge gas from the gas ports toward the predetermined regions at the time of purging. The gas analysis device also has a switching part that switches a connecting destination of the piping mechanism from the purge gas source to a predetermined suction part, and at the time of introducing or analyzing the sample gas, connects the gas ports to the suction source.

The present invention belongs to the technical field of environmental monitoring, in particular to an environmental monitoring device for air pollution, comprising a monitoring frame, a monitoring shell arranged on a top end of the monitoring frame and an environmental monitor fixedly installed inside the monitoring shell through a connecting plate. An air sampling assembly is installed inside the environmental monitor; the air sampling assembly comprises air intake covers, and an electric push rod, a rack I, a gear I, a spur gear, an internal gear, a rotating disk, limiting blocks, limiting rods, a cross limiting track, an L-shaped frame and a strip-shaped plate which are used for driving the air intake covers. A cleaning assembly is installed on the air sampling assembly.

An embodiment device for measuring an odor includes an odor sensor chamber including a cleaning air supply port and a gas inlet port provided at a first side portion and a gas discharge port provided at a second side portion, an odor sensor mounted in the odor sensor chamber, a first valve mounted in the cleaning air supply port, a second valve mounted in the gas inlet port, a third valve mounted in the gas discharge port, a heater mounted in the odor sensor chamber, a cooler mounted in the odor sensor chamber, and a controller configured to perform control to open or close the first valve, the second valve, and the third valve and to turn on or off the heater and the cooler.

A system includes a plurality of semiconductor processing tools; a carrier purge station; a carrier repair station; and an overhead transport (OHT) loop for transporting one or more substrate carriers among the plurality of semiconductor processing tools, the carrier purge station, and the carrier repair station. The carrier purge station is configured to receive a substrate carrier from one of the plurality of semiconductor processing tools, purge the substrate carrier with an inert gas, and determine if the substrate carrier needs repair. The carrier repair station is configured to receive a substrate carrier to be repaired and replace one or more parts in the substrate carrier.

A method and apparatus for measuring endogenous CO concentration in exhaled alveolar air, comprises: proposing a method for injecting samples in small amounts, multiple times, intermittently, and establishing a CO concentration relationship between sample gas and gas in a measuring chamber; establishing a concentration difference/electrical level difference difference value fitting method, to obtain a fitted standard curve for a difference value between the sample gas and base gas; establishing an apparatus for measuring a CO concentration difference and a CO2 concentration difference between sample gas and base gas; proposing a method for compensating a measurement value for endogenous CO in exhaled alveolar air. The problem that the amount of sample gas in a breath test is small, and cannot completely replace the gas originally inside the measuring chamber, is solved. The effect of electrical level zero drift and residual CO of unknown concentration in cleaning gas is eliminated.

A microelectromechanical gas sensor including a fixed part, at least one suspended part in relation to fixed part, at least one sensitive zone carried on the suspended part, the sensitive zone being able to adsorb/absorb and desorb gaseous species or families of gaseous species, a heater for heating at least the sensitive zone, a detector for detecting the adsorption/absorption and desorption of gaseous species or families of gaseous species on the sensitive zone, a controller of controlling the heater so that the heating is applied to at least the sensitive zone with one or more temperature profiles ensuring the adsorption/absorption and desorption of the gaseous species in a controlled manner so as to obtain an individual desorption of each species or families of gaseous species.

A sensor for exhaust gases of an internal combustion engine includes a sensing element enclosed in a sensor housing. The sensor housing includes a protective cap having a plurality of openings formed therein for allowing flow of exhaust gases through the protective cap towards the sensing element. The sensor further includes at least one heating element for burning exhaust gas deposits on the sensor.

A species-specific gas sensor and monitor comprising a light source, a sample enclosure or measurement chamber, an optical interface between the light source, the sample and the detection system, electronics that integrate the light source and the detection system, and computational components, such as an onboard microprocessor for calculation of the gas composition and communications between the sensor and the vehicle electronics. The species-specific gas sensor of the present invention can be used to target gases, such as nitric oxide (NO), nitrogen dioxide (NO.sub.2) ammonia (NH.sub.3), and sulfur dioxide (SO.sub.2) which are measurable in the UV spectrum.

A method includes receiving a carrier, the carrier including a carrier body, a first filter, and a housing securing the first filter to the carrier body. The method further includes uninstalling the housing from the carrier, replacing the first filter with a second filter, reinstalling the housing on the carrier body, and inspecting the second filter. Inspecting the second filter includes using an automatic inspection mechanism to detect surface flatness of the second filter.

The invention relates to a probe housing for accommodating sensors, including a plurality of coolant conduits distributed in the circumferential direction; at least one flushing medium conduit; and a sensor lead-through hole. The sensor lead-through hole extends at least partially parallel to the at least one flushing medium conduit; and a sensor receptacle into which the sensor lead-through hole opens. The sensor receptacle has a measuring section opening, and the sensor receptacle has a flushing medium outlet conduit having a flushing medium outlet which is connected to the at least one flushing medium conduit, and the flushing medium outlet conduit has a tapering cross-section to form a nozzle shape.