Gas sampling method and dilution tunnel therefor
First Claim
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1. A device for testing gaseous emissions from a gas exit, comprising:
- a dilution tunnel comprising an elongated, hollow tube having an inlet and an outlet;
means for spacing said inlet of the tube inline from the gas exit so as to admit emissions and surrounding air into the dilution tunnel through the inlet; and
means for analyzing the emissions in the tunnel.
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Abstract
Emission gasses from an engine exhaust pipe are collected through an inlet of a dilution tunnel which is an elongated, hollow tube. The inlet is spaced from the exhaust pipe to also admit surrounding air. The air and emissions are mixed in the tunnel by a screen in the tunnel. A probe in the tunnel diverts a portion of the mixture to gas analyzers. Prior to analysis the mixture may be condensed, filtered or otherwise processed.
48 Citations
20 Claims
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1. A device for testing gaseous emissions from a gas exit, comprising:
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a dilution tunnel comprising an elongated, hollow tube having an inlet and an outlet; means for spacing said inlet of the tube inline from the gas exit so as to admit emissions and surrounding air into the dilution tunnel through the inlet; and means for analyzing the emissions in the tunnel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device for testing gaseous emissions from a gas exit, comprising:
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a dilution tunnel comprising an elongated, hollow tube having an inlet for emission gasses and an outlet; means for spacing the inlet inline from the gas exit so as to admit emissions and surrounding air into the dilution tunnel through the inlet; means for analyzing the emissions; a tubular probe disposed in the tunnel and opening toward the inlet for diverting a portion of the emissions from the tunnel to the analyzing means; and means for facilitating mixing of the air and emissions disposed in the tunnel between the inlet and the probe.
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18. A method of testing gaseous emissions from a gas exit, comprising the steps of:
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locating an inlet of a dilution tunnel comprising an elongated, hollow tube a selected distance from the gas exit so as to be spaced inline from the gas exit so as to admit emissions and surrounding air into the tunnel through the inlet; and analyzing the emissions in the tunnel. - View Dependent Claims (19, 20)
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Specification