Combustible gases detector
First Claim
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1. A detector for monitoring combustible gases in an airstream comprising:
- a first thermocouple junction located in the airstream;
a second thermocouple junction located in the airstream and connected to said first thermocouple to form a differential thermocouple;
catalytic means formed around said first thermocouple junction allowing heated combustibles in the airstream to react with said catalytic means to liberate heat and increase the temperature of said first thermocouple above that of said second thermocouple;
insulation means formed around said second thermocouple junction to prevent combustibles in the airstream from reacting with said second thermocouple junction to liberate heat including a tube of non-catalytic material mounted on said second thermocouple junction with a non-catalytic cement material formed around said non-catalytic tube; and
means connected to said first and second thermocouple junctions for indicating the temperature differential between said first and second thermocouple junctions.
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Abstract
A differential thermocouple combustible gas detector is provided by coating one thermocouple junction of a differential thermocouple pair with a catalyst and the other thermocouple junction with a non-catalyst. Heated combustible gases react with the catalyst to liberate heat to the catalyst coated thermocouple junction in proportion to the concentration of combustible gases and proportionally raise the temperature of that junction above the non-catalyst coated junction. The output signal from the differential thermocouple device is thus a signal indicative of the concentration of combustible gases.
34 Citations
12 Claims
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1. A detector for monitoring combustible gases in an airstream comprising:
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a first thermocouple junction located in the airstream; a second thermocouple junction located in the airstream and connected to said first thermocouple to form a differential thermocouple; catalytic means formed around said first thermocouple junction allowing heated combustibles in the airstream to react with said catalytic means to liberate heat and increase the temperature of said first thermocouple above that of said second thermocouple; insulation means formed around said second thermocouple junction to prevent combustibles in the airstream from reacting with said second thermocouple junction to liberate heat including a tube of non-catalytic material mounted on said second thermocouple junction with a non-catalytic cement material formed around said non-catalytic tube; and means connected to said first and second thermocouple junctions for indicating the temperature differential between said first and second thermocouple junctions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A differential thermocouple device for detecting carbon monoxide in air comprising:
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a first thermocouple junction formed from dissimilar metals; a second thermocouple junction formed form the same dissimilar metals as said first thermocouple and being electrically connected to said first thermocouple to oppose the electrical output signal of said first thermocouple; a catalytic material tube mounted on said first thermocouple junction to react with the carbon monoxide in the air to liberate heat in proportion to the concentration of carbon monoxide and increase the temperature of said first thermocouple junction located in said catalytic material tube; a non-catalytic material tube located on said second thermocouple junction to prevent any reaction with the carbon monoxide in the air at the second thermocouple junction; and detection means connected to said first and said second thermocouple junctions to provide an output responsive to the temperature difference between said first and second thermocouple junctions to indicate the concentration of carbon monoxide thereby. - View Dependent Claims (9, 10, 11, 12)
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Specification