Differential gas sensing in-line monitoring system
July 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2889701 Modulated fluid detector Methods of detection with surface acoustic wave and apparati therefor Detector with intermittent flow Oxygen analyzer Method of detecting and or removing trace amounts of condensible vapors from compressed gas In-line detector system for real-time determination of impurity concentration in a flowing gas stream Method and device for detecting reducing gas using semiconductor gas sensor Process and apparatus for supplying gas to a very highly sensitive analyzer In-line detector system for real-time determination of impurity concentration in a flowing gas stream Patent #: 5325705 InventorAssigneeApplicationNo. 270171 filed on 07/01/1994US Classes:73/31.03, Impurity73/1.06GasExaminersPrimary: Brock, MichaelAttorney, Agent or FirmInternational ClassG01N 027/00AbstractAn in-line detector system and method for real-time detection of impurity concentration in a flowing gas stream. In a specific aspect, the system may comprise an in-line monitoring system for determining the calibrated concentration of an impurity species in a flowing gas stream, in a low concentration range below a predetermined concentration value, and in a high concentration range above said predetermined concentration value. The system may utilize hygrometric sensors in the case of water as a critical impurity, or surface acoustical wave (SAW) devices coated with suitable impurity-affinity coatings. The method includes sensing the impurity species concentration in gas derived from the gas flow stream in a sequential and repetitive sensing operation. In a first sensing mode the gas is purified of impurity species prior to sensing thereof and in a second sensing mode the gas is unpurified. In the first sensing mode and second sensing mode, the cycle times are varied in accordance with the impurity species concentration. In the low concentration range the second sensing mode cycle time is longer than the first sensing mode cycle time and in the high concentration the first sensing mode cycle time is longer than the second sensing mode cycle time.Other References
Field of SearchGAS ANALYSISWith compensation detail (for error or drift correction, etc.) Baseline drift correction circuitry Hygrometer Impurity Impurity Including means for adsorbing or absorbing gas into or onto liquid or solid media Including means dividing sample stream into plural parallel segments having diverse treating means and the analytical result compared or combined | |
