Multipurpose dynamic controlled atmosphere chamber
First Claim
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1. A dynamic, controlled atmosphere exposure testing chamber comprising:
- an enclosure having an air inlet port and an exhaust gas outlet port;
means for introducing a pre-selected contaminant gas flow into said enclosure through said air inlet port;
a gas diffusion baffle plate located inside said enclosure transversely of said enclosure and perpendicular to said gas flow direction;
a hanger located inside said enclosure, essentially parallel to said baffle plate and downstream thereof with respect to said gas flow direction;
a first industrial hygiene passive monitor mounted on said hanger;
a plurality of sampling ports located in a wall of said enclosure downstream of said baffle plate;
a first industrial hygiene active monitor connected to at least one of said sampling ports;
a sampling pump connected to said active monitor;
a gas chromatograph connected to one of said sampling ports;
a total hydrocarbon analyzer connected to one of said sampling ports;
an access port located in said enclosure wall;
a temperature/relative humidity indicator connected to said access port; and
means located external to said enclosure and connected to said outlet port for treating said contaminant gas before venting to the atmosphere.
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Abstract
A stainless steel exposure chamber utilizes either a gas cylinder standard or a permeation tube standard to generate the required test atmosphere. The concentrations of the contaminants in the chamber can be varied from lower parts per billion (ppb) to high parts per million (ppm) levels. The system is capable of testing several types of industrial hygiene samplers at the same time, under the same chamber conditions and at different orientations of the samplers. The chamber is also useful for the development and verification of industrial hygiene air-monitoring methods.
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Citations
12 Claims
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1. A dynamic, controlled atmosphere exposure testing chamber comprising:
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an enclosure having an air inlet port and an exhaust gas outlet port; means for introducing a pre-selected contaminant gas flow into said enclosure through said air inlet port; a gas diffusion baffle plate located inside said enclosure transversely of said enclosure and perpendicular to said gas flow direction; a hanger located inside said enclosure, essentially parallel to said baffle plate and downstream thereof with respect to said gas flow direction; a first industrial hygiene passive monitor mounted on said hanger; a plurality of sampling ports located in a wall of said enclosure downstream of said baffle plate; a first industrial hygiene active monitor connected to at least one of said sampling ports; a sampling pump connected to said active monitor; a gas chromatograph connected to one of said sampling ports; a total hydrocarbon analyzer connected to one of said sampling ports; an access port located in said enclosure wall; a temperature/relative humidity indicator connected to said access port; and means located external to said enclosure and connected to said outlet port for treating said contaminant gas before venting to the atmosphere. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification