Calibration and accuracy check system for a breath tester
First Claim
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1. A calibration system for a breath tester comprising:
- a storage reservoir containing a mixture of water and an alcohol at known concentration;
a dispensing head for dispensing said mixture, said dispensing head including;
a nozzle for ejecting said mixture from said storage reservoir; and
means for amplifying induced capillary waves into said mixture;
wherein said dispensing head injects said mixture directly into a reaction chamber of said breath tester.
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Abstract
Calibration and accuracy check systems for a chemical sniffer, such as a breath alcohol tester, which utilize the dispensing of droplets with determinable concentration of alcohol and/or other liquids in a determinable number either directly to a reaction chamber, or into a carrier gas which can be sampled. The systems generally provide for accurate sample concentration being provided to the breath tester while also providing for a simplified system which can be easier to move, and require less operational complexity, than prior wet or dry calibrating systems.
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Citations
17 Claims
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1. A calibration system for a breath tester comprising:
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a storage reservoir containing a mixture of water and an alcohol at known concentration; a dispensing head for dispensing said mixture, said dispensing head including; a nozzle for ejecting said mixture from said storage reservoir; and means for amplifying induced capillary waves into said mixture; wherein said dispensing head injects said mixture directly into a reaction chamber of said breath tester. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A combination calibration system and breath tester comprising:
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a breath tester, said breath tester comprising; a as reaction chamber; a manifold for accepting a human breath; a sampling inlet, said sampling inlet connecting between said gas reaction chamber and said manifold; and a sampling piston, operation of said sampling piston forcing a sample of material from said manifold, through said sampling inlet, and into said gas reaction chamber; a calibration system, said calibration system comprising; a storage reservoir containing alcohol; a dispensing head for dispensing droplets of known size from said storage reservoir; and a monitoring system for determining the number of droplets dispensed from said dispensing head; wherein said dispensing head dispenses a determinable number of droplets to said gas reaction chamber without said sampling piston operating and said breath tester is calibrated based on the resulting concentration of alcohol in said number of droplets dispensed. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of calibration of a breath tester, the method comprising:
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providing a storage reservoir containing alcohol internal to a breath tester; dispensing a determinable number of droplets of known size from said storage reservoir directly to a gas reaction chamber in said breath tester; determining said number of droplets entering said gas reaction chamber; determining the breath alcohol level said number of droplets represents; and calibrating said breath tester based on the resulting concentration of alcohol. - View Dependent Claims (15, 16, 17)
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Specification