A particle detecting device is provided. The particle detecting device includes a resonator and a piezoelectric actuator. The piezoelectric actuator is used to transport a gas into the resonator, and a mass and a concentration of the screened and required-diameter particles are detected through the resonator. Thus, the air quality can be monitored immediately anytime and anywhere.

A therapeutic gas is administered to a patient. A sample gas is drawn from the therapeutic gas supply, and passed through a water-permeable tubular membrane. Concurrently, a section of the water permeable tubular membrane is maintained as a ventilated water permeable tubular membrane, by exposing outer surfaces of the ventilated water permeable tubular membrane to an ambient air flow. The ambient air flow may in some examples be moved over the tubular membrane via forced air such as for example via a fan associated with a housing surrounding the tubular membrane.

A technique for monitoring and collecting environmental data is provided that supports acquisition and analysis of quality measurements of pollutants by sensors based on different technologies in an integrated manner. The system includes a primary substrate having a plurality of sensor modules, each sensor module configured to couple to a sensor, and a manifold having a plurality of flow hoods, each flow hood disposed on a top surface of a sensor and connected to another flow hood or component in the manifold. In some cases, the sensor modules are gas sensor modules, and the sensor is a gas sensor. The manifold thus provides a closed system through which a fluid sample can flow across a series of gas sensors in an actively controlled manner that enables independent flow control over each individual gas sensor while limiting exposure of the fluid sample to potential sources of contamination.

A pre-concentration device is provided for a gas analysis system (10) for collecting molecular contamination in a vacuum environment (11). The pre-concentration device (13) comprises a hollow element (15) having an entrance opening (20) for receiving molecules from the vacuum environment (11) in a collection phase, a gas outlet for transferring collected molecules to a vacuum compatible detector or second preconcentration device in a transfer phase. The device has an inner wall for adsorbing molecules in the collection phase and desorbing molecules in the transfer phase. The device has a filler element (14) that is movable from a first position outside the hollow element in the collection phase to a second position inside the hollow element in the transfer phase which second position leaves open a transfer channel to the gas outlet along the inner wall. Advantageously, the device enables transferring of the organic or inorganic contaminants collected in the device under vacuum conditions, and requires a minimal amount of ultra pure gas for the transport of the contaminants to a detector or further a concentration device, which lowers the lower limit of detection.

A system for measuring air quality, including a housing having an inlet, and outlet, and defining an air pathway therebetween, an air pump operationally connected in fluidic communication with air inlet and outlet for urging along the air flow pathway, a particle collector having an adhesive side positioned in the air flow pathway, and an electronic controller operationally connected to the optical sensor assembly for sending control signals to the optical sensor assembly and for receiving data from the optical sensor assembly. The system also includes an optical sensor assembly positioned for optical interrogate the particle collector, and further including a light source positioned to shine on the particle collector and an optical sensor positioned to receive light travelling from the particle collector.

A method for testing a gas sensor (30) and a gas-measuring device with a testing device for testing the gas sensor (30) make possible an improved analysis and evaluation of states of gas sensors (30). Due to the testing of a gas admission element (8) by monitoring measured signals (35, 38) in a time course (400) and a comparison with threshold values (350, 351) at predefined times (403, 404), (403″, 404″) in conjunction with the dispensing (91) of a quantity of test substance (5, 6), it is possible to test whether a gas supply (7) to the gas sensor (30, 309) is possible and given.

A therapeutic gas is administered to a patient. A sample gas is drawn from the therapeutic gas supply, and passed through a water-permeable tubular membrane. Concurrently, a section of the water permeable tubular membrane is maintained as a ventilated water permeable tubular membrane, by exposing outer surfaces of the ventilated water permeable tubular membrane to an ambient air flow. The ambient air flow may in some examples be moved over the tubular membrane via forced air such as for example via a fan associated with a housing surrounding the tubular membrane.

A gas inlet system for introducing gas into an isotope ratio analyser, the gas inlet system including a reference system comprising: a first supply of a reference gas having a first known isotope ratio; a supply of a carrier gas, wherein the supplies of reference gas and carrier gas are each connected by respective reference and carrier gas lines to a first mixing junction where the reference gas and carrier gas combine; a mixing zone connected downstream of the first mixing junction wherein the combined reference gas and carrier gas mix together; an exit line for transporting the mixed gas from the mixing zone to the isotope ratio analyser; and an opening on the exit line, wherein the opening is downstream of the mixing zone. Also provided is a method of determining an isotope ratio.

The present disclosure is directed to methods and systems for creating a gas curtain inlet for a detector of a substance of interest. The methods and systems include introducing a carrier gas into an inlet to block out atmospheric air without having to make the inlet a sealed system.

A monitoring system (100) is provided for flight crew members (99), e.g., aviators, pilots, copilots or passengers, of airplanes or aircraft, e.g., airplanes or helicopters of the civil or military aviation, passenger planes in the scheduled or charter service, especially also ultrafast passenger planes. The monitoring system includes a sensor mechanism and a control unit configured to organize a procedure of a measurement-based monitoring of the gas composition of air, breathing air or breathing gases with the sensor mechanism in an airplane or aircraft, and to control or regulate the procedure. A measurement-based detection of gas concentrations is carried out with the sensor mechanism (60).