Methods and systems for conditioning a gas sample for analysis and measuring, detecting, and/or determining the concentration of at least one analyte in a gas sample. Methods include a combination and/or repetition of dehumidifying and/or humidifying the gas, and/or performing a chemical reaction an analyte, and measuring, detecting, and/or determining the concentration of an analyte or an output analyte resulting from the chemical reaction. Systems to adjust the humidity of a gas sample and/or perform a chemical reaction on an analyte, and measure, detect, and/or determine the concentration of an analyte or an output analyte resulting from the chemical reaction comprise cartridges, capsules, test strips or test strip chambers and one or more sensors. Systems may further comprise a humidity exchange material to further adjust the humidity. Gas samples include exhaled breath. Analytes include nitric oxide. Output analytes include nitrogen dioxide.

The invention relates to a breath test system that is unobtrusive in that it does not require a person subjected to the system to take any other action to breath. It comprises a sensor unit (5) configured to sense the presence or concentration of a volatile substance, present in air flowing through a predefined inlet area (4), and to generate a signal corresponding to the concentration of said substance. There is also provided an apparatus (2, 3) configured to detect the presence of a person at a position in the vicinity of said input area, and having means for registering said presence, and further configured to respond to said presence by delivering an output. This said apparatus includes a unit configured to call for immediate attention of said person, upon said registration of the presence of said person, and a unit configured to provide instructions to said person to direct an expiratory air flow towards said inlet area (4). An analyzer (10) for the determination of breath substance concentration of said person is also provided, the determination being based on said signal corresponding to the substance concentration.

A fixed bed (10) is provided for a fixed-bed reactor (100). The fixed bed (10) contains a particulate carrier and at least one reactive substance. The carrier is a silicate compound and the reactive substance is an organometallic pyridine compound. A method for preparing such a fixed bed is provided. The method includes the steps of preparing the carrier, preparing an impregnation and treating the carrier with the impregnation. In addition, a gas-measuring tube is provided with a correspondingly prepared fixed bed as well. A method uses organometallic pyridinium compounds, especially pyridinium dichromate, in a fixed-bed reactor for detecting alcohol compounds and for preparing formaldehyde and/or acetaldehyde.

Described herein are Dirofilarial exhalant signatures and methods of detecting a Dirofilaria signature in a non-blood biological sample, such as exhalant, that can be used to detect Dirofilarial infection in a subject, such as a canine.

A portable device for measuring the concentration of at least one component in a gas exhaled by a breath fluid, including a first chamber located upstream of a measuring vessel and including an inlet through which the exhaled breath fluid enters the first chamber, a second chamber located upstream of the measuring vessel, the second chamber including an inlet leading into the first chamber, an outlet in communication with the measuring vessel and through which some of the exhaled breath fluid passes, and an outlet leading to the ambient air, through which some of the exhaled breath fluid is expelled into the ambient air. Further, the second chamber is located inside or adjacent the first chamber and the outlet to the ambient air leads to the first chamber so some of the exhaled breath fluid enters the second chamber through the inlet of the second chamber.

Electrochemical sensors commonly used in breath alcohol testing devices detect a concentration of alcohol in a sample of fluid. The sample of fluid is introduced into the electrochemical sensor and a current is generated by the oxidation of the alcohol within the fluid. The electrical output from the electrochemical sensor, plotted over time, forms an output curve, which may be used to estimate the concentration of alcohol in the fluid sample. The technology disclosed herein includes various methods for determining the quantity of an electrochemically convertible substance in a fluid sample using a breath alcohol content device, including detecting water saturation level of the fluid sample. The disclosed technology involves measuring electrochemical sensor outputs to quantify alcohol content of the fluid sample.

The present invention relates to provide, among other things, the methods, devices, and systems that can simply and quickly collecting and analyzing a tiny amount of vapor condensates (e.g. exhaled breath condensate (EBC)).

An exhaust gas dilution device according to an exemplary embodiment of the present invention includes a head part, ejector unit, a nozzle part, and a dilution part. The head part has a space part into which an exhaust gas flows and a through-hole formed through the center axis direction to be connected to the space part. The ejector unit is coupled to the head part and has a first discharge hole formed passing through the center axis direction to be connected to the through-hole and connected to a first inlet to which primary dilution air is supplied. The nozzle part is inserted into a first discharge hole through the through-hole and has a second discharge hole that penetrates in the center axis direction so that the exhaust gas flowed into the space part is sucked and ejected into the first discharge hole as the primary dilution air moves through the first discharge hole. The dilution part has a first flow path part into which a primary dilution gas, which is generated and discharged after the exhaust gas and the primary dilution air are mixed in the first discharge hole, flows, and a second flow path part connected to the first flow path part and guiding secondary dilution air to be mixed with the primary dilution gas, and generates a secondary dilution gas as the primary dilution gas and the secondary dilution air are mixed.

A process for testing an air source by providing a bag to collect a sample of gas. Connecting the filled bag to a collector assembly that has a fraction of the interior volume of the bag. Forcing the air sample from the bag over a media dish inside the collector assembly. Removing the media for further analysis. Both the bag and the collector assembly have one way exhaust valves to prevent over-pressure and allow a limited flow through of the sample.

Techniques for detecting cannabinoid, opioid, and virus aerosols in an exhaled breath are provided. An example method of identifying a virus-containing aerosol in exhaled breath includes capturing a breath input in an aerosol filter cartridge, disposing the aerosol filter cartridge in an optical path in a spectroscopy system, detecting one or more infrared spectral features of the breath input with the spectroscopy system, and identifying the virus-containing aerosol based on the one or more infrared spectral features.