Hydrocarbon vapor sensor and system
First Claim
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1. A hydrocarbon vapor sensor, comprising:
- a member having first and second surfaces;
first sensing means mounted in a stretched state on said first surface of said member for sensing hydrocarbon vapor;
second sensing means mounted in a stretched state on said second surface of said member for sensing temperature and providing temperature compensation;
perforated cover means for covering said first sensing means; and
cover means for hermetically sealing said second sensing means.
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Abstract
A hydrocarbon vapor sensor which is simple and low cost and can easily detect the existence of hydrocarbon vapor. The device is temperature compensated so that a change in resistance due to a change in temperature is avoided and an arcurate response is always provided. The sensor can be used in a system in which a number of sensors are provided at various depths to determine whether a leak or a ground spill has occurred.
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Citations
13 Claims
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1. A hydrocarbon vapor sensor, comprising:
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a member having first and second surfaces; first sensing means mounted in a stretched state on said first surface of said member for sensing hydrocarbon vapor; second sensing means mounted in a stretched state on said second surface of said member for sensing temperature and providing temperature compensation; perforated cover means for covering said first sensing means; and cover means for hermetically sealing said second sensing means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hydrocarbon vapor sensor system having an underground storage tank, said hydrocarbon sensor system comprising:
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first hydrocarbon vapor sensor means located near a bottom portion of the storage tank, for sensing hydrocarbon vapor; second hydrocarbon vapor sensor means located near a portion of the storage tank between a top portion of the storage tank and the bottom portion of the storage tank, for sensing hydrocarbon vapor; third hydrocarbon vapor sensor means located near the top portion of the storage tank, for sensing hydrocarbon vapor near the top portion of the storage tank; means connectable at the top portion of the storage tank, for determining a leak when a resistance of said first hydrocarbon vapor sensor means is greater than a resistance of said second hydrocarbon vapor sensor means and the resistance of said second hydrocarbon vapor sensor means is greater than a resistance of said third hydrocarbon vapor sensor means and for determining a spill when the resistance of said first hydrocarbon vapor sensor means is less than the resistance of said second hydrocarbon vapor sensor means which is less than the output from said third hydrocarbon vapor sensor means. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification