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- Nachgewiesen in: USPTO Patent Applications
- Sprachen: English
- Document Number: 20240102980
- Publication Date: March 28, 2024
- Appl. No: 18/472963
- Application Filed: September 22, 2023
- Assignees: Thermo Fisher (Shanghai) Instrument Co., Ltd. (Shanghai, CN)
- Claim: 1. A gas detection device for detecting volatile organic compounds in a sample gas, comprising: a dehydration unit configured to dehydrate the sample gas flowing into the dehydration unit by condensation, the dehydration unit comprising a first port; a concentration unit arranged downstream of the dehydration unit in a flow direction of the sample gas and in fluid communication with the dehydration unit, the concentration unit comprising a second port; and a temperature control unit for controlling a temperature, wherein the gas detection device includes a sampling mode, in which the sample gas flows into the dehydration unit through the first port and flows out of the concentration unit through the second port, wherein the volatile organic compounds in the sample gas are concentrated in the concentration unit, and the temperature control unit is 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 set by the temperature control unit for the concentration unit, wherein the gas detection device further comprises an analysis unit for analyzing the volatile organic compounds, and includes a desorption mode, in which a carrier gas flows into the concentration unit from the second port, such that the volatile organic compounds desorbed from the concentration unit flows to the analysis unit with the carrier gas, wherein the dehydration unit comprises a reduced-diameter portion that has a reduced diameter in the flow direction of the sample gas, and in the sampling mode, the sample gas flows out of the dehydration unit through the reduced-diameter portion, and in the desorption mode, a part of the carrier gas can flow into the dehydration unit through the reduced-diameter portion for branch-off.
- Claim: 2. The gas detection device according to claim 1, wherein the temperature control unit comprises a cooling apparatus that can cool an entire sample gas flow path from the dehydration unit to the concentration unit.
- Claim: 3. The gas detection device according to claim 2, wherein the temperature control unit comprises a first heating apparatus for heating the dehydration unit and/or a second heating apparatus for heating the concentration unit.
- Claim: 4. The gas detection device according to claim 1, wherein the temperature control unit is configured to make the first preset temperature greater than a second preset temperature set for the dehydration unit by a first temperature difference, wherein the first temperature difference is 0° C. to 10° C., and the second preset temperature is in a range of −45° C. to −35° C.
- Claim: 5. The gas detection device according to claim 1, wherein the gas detection device comprises a capillary tube which includes a first open end and a second open end, wherein the first open end is in communication with the analysis unit, and the second open end is in fluid communication with an interior of the concentration unit, and wherein in the desorption mode, the carrier gas loaded with the volatile organic compounds can flow to the analysis unit through the capillary tube.
- Claim: 6. The gas detection device according to claim 5, wherein the second open end is located inside the dehydration unit, such that in the desorption mode, the carrier gas containing the volatile organic compounds flows into the capillary tube inside the dehydration unit, wherein a part of the carrier gas can be branched off by means of at least one of the first port and another port of the dehydration unit.
- Claim: 7. The gas detection device according to claim 1, wherein the gas detection device further includes a purge mode, in which the temperature control unit can heat the dehydration unit to convert condensed substances therein into water vapor, such that the water vapor can be blown out from the dehydration unit.
- Claim: 8. The gas detection device according to claim 3 wherein the second heating apparatus comprises a heat generating mechanism arranged around the concentration unit and an insulating sleeve arranged outside of the heat generating mechanism and configured to fix the heat generating mechanism.
- Claim: 9. A method for detecting volatile organic compounds in a sample gas by using a gas detection device, the gas detection device comprising a dehydration unit with a first port and a concentration unit with a second port, wherein the method comprises a sampling step, in which the sample gas flows into the dehydration unit through the first port and flows out of the concentration unit through the second port, wherein the sampling step comprises: dehydrating the sample gas by condensation in the dehydration unit; concentrating the volatile organic compounds in the sample gas within the concentration unit; and controlling a temperature of the sample gas, 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 set for the concentration unit, wherein the gas detection device further comprises an analysis unit for analyzing the volatile organic compounds, the method further comprises a desorption step performed after the sampling step, wherein said desorption step includes heating the concentration unit to desorb the volatile organic compounds, making a carrier gas flow through the concentration unit, to carry the desorbed volatile organic compounds out of the concentration unit and to the analysis unit, wherein the dehydration unit comprises a reduced-diameter portion that has a reduced diameter in the flow direction of the sample gas, and in the sampling step, the sample gas flows out of the dehydration unit through the reduced-diameter portion, and in the desorption step, a part of the carrier gas can flow into the dehydration unit through the reduced-diameter portion for branch-off.
- Claim: 10. The method according to claim 9, wherein the sampling step further comprises: controlling the temperature of the sample gas to make the first preset temperature greater than a second preset temperature set for the dehydration unit by a first temperature difference, wherein the first temperature difference is 0° C. to 10° C., and the second preset temperature is in a range of −45° C. to −35° C.
- Claim: 11. The method according to claim 10, wherein the method comprises a purge step performed after the sampling step, wherein the purge step comprises: heating the dehydration unit to convert condensed substances therein into water vapor, and blowing the water vapor out from the dehydration unit.
- Current International Class: 01
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