Toxic gas detector with a time measurement sensor
First Claim
1. A gas detector comprising the elements of:
- a. a gas sensor;
b. a capacitor;
c. a transformer;
d. a gated time measuring device; and
e. a permanent memory chip;
all of which are interconnected by means of and are integral with a circuit board wherein the gated time measuring device measures a time for the capacitor to charge, which time measurement value is an indicator of the presence of a gas.
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Abstract
The present invention is a carbon monoxide or other toxic gas detector. The detector of the present invention detects the presence of carbon monoxide in an air sample by measuring the time required for the sensor circuitry to charge. Such a measurement technique eliminates the inaccuracies inherent in prior art detectors which measure the resistance of the sensor circuitry upon exposure to carbon monoxide. The detector of the present invention is controlled by a microprocessor which enables the detector to retain in memory air sample readings of carbon monoxide or other toxic gas. If the detector registers four consecutive readings which indicate the presence of carbon monoxide in an air sample in a concentration greater than or equal to about 100 ppm, then the alarm of the detector will be triggered, thereby alerting the user to a dangerous concentration of carbon monoxide gas in the air. Such a detection cycle enables the detector to detect not only high level, lethal concentrations of carbon monoxide in the air, but also, chronic, low level harmful concentrations of carbon monoxide in the air.
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Citations
26 Claims
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1. A gas detector comprising the elements of:
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a. a gas sensor; b. a capacitor; c. a transformer; d. a gated time measuring device; and e. a permanent memory chip; all of which are interconnected by means of and are integral with a circuit board wherein the gated time measuring device measures a time for the capacitor to charge, which time measurement value is an indicator of the presence of a gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A carbon monoxide detector comprising the elements of:
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a. a toxic gas sensor; b. a capacitor; c. a transformer; d. a gated measuring device; e. a permanent memory chip; f. an audio alarm; g. a visual alarm; and h. a power source all of which are interconnected by means of and are integral with a circuit board, wherein all of the elements are housed in a casing, wherein the capacitor and the sensor are in a series circuit with each other and wherein the gated time measuring device measures a time for the capacitor to charge, which time measurement value is an indicator of the presence of carbon monoxide. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification