Measuring apparatus for detecting gases
First Claim
1. A measuring apparatus for detecting a gas present in the ambient, the measuring apparatus comprising:
- an electrochemical sensor unit including;
an electrolyte chamber for accommodating an electrolyte therein;
measuring electrode means disposed in said electrolyte chamber for providing a measurement signal;
a diffusion membrane separating said electrolyte chamber from the ambient;
a diffusion barrier assembly interposed between said diffusion membrane and the ambient;
said diffusion barrier assembly including pass-through opening means having a cross section for allowing the gas to pass therethrough to said diffusion membrane;
valve means for adjusting said cross section in size so as to permit more or less amounts of the gas to pass to said diffusion membrane; and
,comparator means for comparing said measurement signal with a limit value and for driving said valve means whereby said cross section of said opening is changed in dependence upon the comparison to said limit value.
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Accused Products
Abstract
The invention is directed to a measuring apparatus for detecting gases with the aid of an electrochemical sensor with a diffusion barrier being disposed ahead of the sensor. The measuring apparatus is improved in such a manner that the sensor is adaptable with respect to its sensitivity to different measuring ranges during operation without external intervention. The speed of response of the sensor is also increased. Diffusion openings in the diffusion barrier are closable with a valve arrangement associated with the valve openings. The valve arrangement is connected via a valve drive unit to a measurement value comparator for changing the operating position of the particular valve to be actuated.
16 Citations
5 Claims
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1. A measuring apparatus for detecting a gas present in the ambient, the measuring apparatus comprising:
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an electrochemical sensor unit including; an electrolyte chamber for accommodating an electrolyte therein; measuring electrode means disposed in said electrolyte chamber for providing a measurement signal; a diffusion membrane separating said electrolyte chamber from the ambient; a diffusion barrier assembly interposed between said diffusion membrane and the ambient; said diffusion barrier assembly including pass-through opening means having a cross section for allowing the gas to pass therethrough to said diffusion membrane; valve means for adjusting said cross section in size so as to permit more or less amounts of the gas to pass to said diffusion membrane; and
,comparator means for comparing said measurement signal with a limit value and for driving said valve means whereby said cross section of said opening is changed in dependence upon the comparison to said limit value. - View Dependent Claims (2, 3, 4, 5)
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Specification