The invention relates to a system and micro monitor apparatus, a space-, time-, and cost-efficient device to concentrate, identify, and quantify organic compounds in gas environments. The invention further relates to a method centered on gas chromatography for identifying and quantifying organic compounds in gas environments, using air as the carrier gas, without the need for a compressed pre-bottled purified carrier gas.

The present application discloses a dehumidifier and a dehumidification system. The dehumidifier comprises a housing and a water absorber located in the housing. An opening and a plug are provided at a lower portion of the housing. The plug is used to seal the opening, and the water absorber can be removed via the opening when the opening is open. A conduit is provided above the housing, an upper gas inlet and an upper gas outlet are provided on the conduit, a gas to be dehumidified enters the conduit via the upper gas inlet and is discharged from the conduit via the upper gas outlet, and the water absorber is used to absorb water in the gas. The dehumidifier according to the present application is easily maintainable.

A system and method of bio-cleaning an ignition interlock device (IID). The method comprises receiving a handheld unit of an IID in a fixtured arrangement with an IID calibration station, and applying, while maintaining the IID handheld unit in the fixtured arrangement, a bio-cleaning agent to at least one ingress port of the IID handheld unit in a consolidated IID bio-cleaning and IID calibration operation.

In an illustrative configuration, a method for monitoring air quality is disclosed. The method includes accepting analyte gas into a cell and reflecting light rays into the analyte gas repeatedly across the cell into at least one sensor. The light scattered by particulate matter in the analyte gas and amount of spectra-absorption due to presence of a gaseous chemical is then measured. Based on the determined amount of spectra-absorption and the measured scattered light the gaseous chemical is then measured.

Methods of the disclosed subject matter provide compensation for sensor drift in a hazard detection device having a plurality of sensors coupled to a processor to determine that a carbon monoxide sensor is drifting and to compensate for the drift by calculating a corrected carbon monoxide measurement value based on the ambient environmental conditions.

The invention relates to a system and micro monitor apparatus, a space-, time-, and cost-efficient device to concentrate, identify, and quantify organic compounds in gas environments. The invention further relates to a method centered on gas chromatography for identifying and quantifying organic compounds in gas environments, using air as the carrier gas, without the need for a compressed pre-bottled purified carrier gas.

Systems and methods for calibrating oxygen sensors in ventilators are provided. An oxygen sensor is coupled in flow communication with a first oxygen gas source. A calibration circuit including a second oxygen gas source is coupled in flow communication with the oxygen sensor and a third oxygen gas source is coupled in flow communication with the oxygen sensor. A controller is configured to determine a calibration curve for the oxygen sensor via the calibration circuit by measuring the second oxygen gas source and the third oxygen gas source. Based on the calibration curve, an oxygen concentration value of the first oxygen gas source is measured and distributed.

A universal safety guard is provided. The guard may comprise a housing comprising an adapter coupling end, a dual mode chamber, a calibration gas port, and an ambient air end. The guard may also comprise an assembly configurable in a sensing position, in which ambient air may be admitted into the chamber, and a calibration position, in which calibration gas may be admitted into the chamber and the ambient air is blocked from reaching the chamber. The guard may comprise a detector adapter comprising a calibration housing fitting at one end and a gas detector fitting at an opposite end. The calibration housing fitting may comprise a static circumferential sealing interface that hermetically engages the adapter coupling end. The gas detector fitting may comprise a dynamic inner circumferential sealing interface for hermetic engagement with a gas detector comprising an outer sealing interface that complements the dynamic inner circumferential sealing interface.

According to an example aspect of the present invention, there is provided a method for preparing a gaseous isotope reference, the method comprising: providing a solid or liquid carbon-containing material exhibiting a carbon isotope ratio; providing oxygen gas or a gas mixture comprising oxygen gas, wherein said gas or gas mixture exhibits an oxygen isotope ratio; determining said carbon isotope ratio in the solid carbon-containing material and/or determining said oxygen isotope ratio in the oxygen gas or the gas mixture comprising oxygen; bringing the solid carbon-containing material in contact with the oxygen gas or the gas mixture comprising oxygen gas, in a high temperature in order to oxidize at least a part of the solid carbon-containing material to carbon dioxide to obtain the gaseous carbon and/or oxygen isotope reference in the form of carbon dioxide.

One variation of a method includes, during a calibration period: triggering collection of an initial bioaerosol sample by an air sampler located in an environment; and triggering dispensation of a tracer test load by a dispenser located in the environment; accessing a detected barcode level of a barcode detected in the initial bioaerosol sample; accessing a true barcode level of the barcode contained in the tracer test load; and deriving a calibration factor for the environment based on a difference between the detected barcode level and the true barcode level. The method further includes, during a live period succeeding the calibration period: triggering collection of a first bioaerosol sample by the air sampler; accessing a detected pathogen level of a pathogen detected in the first bioaerosol sample; and interpreting a predicted pathogen level of the pathogen in the environment based on the detected pathogen level and the calibration factor.