A gas sampling lance with a gas sample pipe for sampling gases wherein the gas sample pipe is divided in a lance pipe and a connecting pipe which connects the lance pipe to a gas scrubber, a first scraper to clean the inside of the lance pipe and a second scraper to clean the inside of the connecting pipe.

The present invention relates to a preprocessing apparatus and a preprocessing method for measuring and analyzing air pollution, and provides the preprocessing apparatus and the preprocessing method, in which there is included a cyclone main body, a block made of aluminum or copper and provided at an outer circumferential edge of the cyclone main body, and a cooling means surrounding the block, such that contaminated gas introduced into the cyclone main body is cooled within a predetermined range, and as a result, it is possible to remove moisture contained in combustion gas by crystallizing the moisture, and to separate particulate matters from the combustion gas based on a cyclone principle.

A cleanliness monitor for monitoring a cleanliness of a vacuum chamber. The cleanliness monitor may include a mass spectrometer, a molecule aggregation and release unit and an analyzer. The molecule aggregation and release unit is configured to (a) aggregate, during an aggregation period, organic molecules that are present in the vacuum chamber and (b) induce, during a release period, a release of a subset of the organic molecules towards the mass spectrometer. The mass spectrometer is configured to monitor an environment within the vacuum chamber and to generate detection signals indicative of a content of the environment; wherein a first subset of the detection signals is indicative of a presence of the subset of the organic molecules. The analyzer is configured to determine the cleanliness of the vacuum chamber based on the detection signals.

The present disclosure relates to the technical field of safety detection, and in particular to a sample collecting and introducing device and a detection system. The sample collecting and introducing device provided by the present disclosure includes a sampling device for collecting a sample, and a semipermeable membrane device for extracting the sample collected by the sampling device and conveying the extracted sample to detection equipment, wherein the sampling device is provided with an air guide cavity, the air guide cavity is configured to guide airflow carrying the sample to flow to the semipermeable membrane device, the semipermeable membrane device is provided with a semipermeable membrane which is arranged outside the sampling device. In the present disclosure, the size of the semipermeable membrane is no longer limited by the sampling device, and therefore the difficulty of increasing the area of the semipermeable membrane is reduced.

A method for estimating moisture content of a gas mixture in a Sample Handling System includes receiving data comprising measurements, and a plurality of parameters related to the gas mixture; analyzing the data to remove one or more anomalies; and calculating a surface area of the gas cooler based on the analyzed data and a determined thermodynamic properties, heat transfer coefficient and mass transfer coefficient of the gas mixture to estimate the moisture content of the gas mixture at an inlet and outlet of a gas cooler.

A sampling device for a gas comprises a block member that includes a gas passageway that defines a flow path for the gas through the block member that has a length less than 36 inches. A liquid collection chamber within the block member along the flow path has therein a deflection plate that directs any liquid in the gas onto a surface of the plate downward into a lower sink zone of the chamber. The chamber includes a porous membrane along the flow path that acts as a barrier to liquid, allowing gas to flow through the membrane and into a passageway segment downstream of the membrane. A pair of mirrors at opposed ends of a light collection block are shaped to reflect multiple passes of light between the mirrors. At one end of the light collection block is a lens that focuses light on the mirror at the other end of the light collection block. A light detector near one end of the light collection block collects light after multiple reflections of the light off the mirrors.

Gas detection devices comprise a dehydration unit a concentration unit, and a temperature control unit for controlling a temperature. The gas detection device includes a sampling mode in which sample gas flows into and out of the dehydration unit through a first port and a second port, respectively, wherein the volatile organic compounds in the sample gas are concentrated in the concentration unit. The temperature control unit may be configured such that the temperature of the sample gas after flowing out from the dehydration unit and before flowing into the concentration unit is not greater than a first preset temperature. Generation of condensed substances in the sample gas can be effectively avoided in a simple manner after the sample gas flows into the concentration unit, thereby further preventing ice blockage. Methods for detecting volatile organic compounds in a sample gas are also disclosed.

The present invention features a device and method for directly collecting airborne particles onto a swab collection substrate. Prior to collection, water vapor may be condensed onto the particles to increase their average diameter. The particles are expelled from one or more acceleration nozzles for gentle impaction onto the swab collection substrate and may be further analyzed through chemical or biological assays.

A gas sampling device is disclosed. The gas sampling device includes a first block having at least a first opening. The first block includes at least a first passageway terminating at the first opening. The first opening may be in an exterior face of the first block. The gas sampling device includes a second block having at least a second opening. The second block includes at least a second passageway terminating at the first opening. The second opening may be in the exterior face of the second block. The first block and the second block may be adjacent and in contact with each other. The first passageway and the second passageway form a flow path, wherein the first block and the second block abut and contact each other, and the first opening and the second opening are aligned.

A method for indoor air analysis, and a sampling arrangement are disclosed. The method includes taking a sample from indoor air in such a way that a surface is cooled to be so cold that water molecules of the indoor air undergo deposition on the surface, whereby frost is generated on the surface; defrosting the frost into water; and analysing the quality of the indoor air from the water.