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US Patent 5066466 - Apparatus for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space
US Patent Issued on November 19, 1991
Estimated Patent Expiration Date:
November 21, 2009Estimated 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.
Estimated Patent Expiration Date:
November 21, 2009Estimated 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.AbstractThe present invention relates to a device for indicating toxic substances in air that is supplied to accommodation used for personnel, preferably the cab of a motor vehicle, this having error compensation for humidity and temperature in one or a plurality of semiconductor gas sensors that are used, in which connection the sensor heating voltage is controlled to provide constant heating output and the sensor temperature pick up as well as the necessary amplifier (control stage) used to generate the temperature-varied heating voltage are arranged in a common housing, and that in the area of the sensors this housing is perforated. In order to permit compensation of the toxic substance, temperature, and humidity correlated output signals that are picked up, the present invention proposes that the characteristic curves of the sensor are reproduced in a voltage divider which, outside the sensor and jointly with the sensor forms a voltage divider for a common supply voltage, such that the influence factors compensate each other in equal proportional changes in value of both the sensor and of the outside wiring. | InventorsAssigneeApplicationNo. 440222 filed on 11/21/1989US Classes:422/98, Analysis based on electrical measurement340/632, Gas340/634, Semiconductor detector422/83, Means for analyzing gas sample422/109Controls heat transferField of Search436/134, Carbon monoxide only436/137, Fuel/air mixture or exhaust gas analysis436/149, MEASUREMENT OF ELECTRICAL OR MAGNETIC PROPERTY OR THERMAL CONDUCTIVITY422/83, Means for analyzing gas sample422/88, Including means for adsorbing or absorbing gas into or onto liquid or solid media422/90, With conductiometric detector422/93, Including means dividing sample stream into plural parallel segments having diverse treating means and the analytical result compared or combined422/98, Analysis based on electrical measurement422/109, Controls heat transfer73/31.02, Impurity73/31.05, Detector detail73/31.06, Semiconductor340/634, Semiconductor detector340/632, Gas338/34Gas, vapor, or moisture absorbing or collectingExaminersPrimary: Lacey, David L.Assistant: Snay, Jeffrey Attorney, Agent or FirmUS Patent References3716337, 3765842, 3851520, 3926561, 4002223, Telescoping collapsible ladderIssued on: 01/11/1977 Inventor: Bernkrant4233033, Method and apparatus for measuring the O2 content of a gas Issued on: 11/11/1980 Inventor: Eifler , et al.4352087, Fume detector and alarm system Issued on: 09/28/1982 Inventor: Wittmaier4498330, Gas detecting and monitoring device Issued on: 02/12/1985 Inventor: Hosoya4519237, Oxygen-sensing system Issued on: 05/28/1985 Inventor: Kubo4533520, Circuit for constant temperature operation of a catalytic combustible gas detector Issued on: 08/06/1985 Inventor: Bossart , et al.4644333, Gas sensor and detection system comprising such a sensor Issued on: 02/17/1987 Inventor: Barendsz , et al.4730479, Temperature and humidity compensation for gas detection apparatus Issued on: 03/15/1988 Inventor: Pyke , et al.4882287Process for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space Issued on: 11/21/1989 Inventor: Holter, et al. International ClassG01N 027/04Foreign Application Priority Data1985-07-19 DE |
