Functional testing method for toxic gas sensors
June 8, 2012. 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 3844905 Optical smoke detector with smoke effect simulating means Calibrating mechanism of an infrared analyzer Infrared gas analyzer with automatic zero adjustment Method and apparatus for near infrared reflectance measurement of non-homogeneous materials Non-dispersive infrared gas analyzer system Method and apparatus for detecting a component gas in a sample Method for providing general calibration for near infrared instruments for measurement of blood glucose Calibrators for infrared-type gas analyzers Patent #: 5206511 InventorAssigneeApplicationNo. 894919 filed on 06/08/1992US Classes:73/1.07, Span or zero250/252.1, CALIBRATION OR STANDARDIZATION METHODS250/343, With means to transmission-test contained fluent material436/9Simulative of a gaseous compositionExaminersPrimary: Williams, HezronAssistant: Dombroske, George M. Attorney, Agent or FirmInternational ClassesG01N 021/35G01C 025/00 G01D 018/00 G12B 013/00 AbstractThe proper operation of an NDIR toxic gas sensor can be checked by using a non-toxic gas that has an absorption band that overlaps the absorption band used for measuring the toxic gas. The NDIR sensor cannot distinguish which of the two gases is responsible for causing the observed absorption of radiation in the sensor. Since detectors of toxic gases typically operate at low concentration levels, the extent of overlap between the absorption band of the toxic gas and of the non-toxic gas may be relatively small, since a larger concentration of the non-toxic gas can be used with no ill effects. The method may be applied to sensors for detecting carbon monoxide or methane for example. |
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