Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-02-27
1991-09-10
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 67, 55197, 55386, B01D 1503
Patent
active
050470736
ABSTRACT:
Selective detection of an analyte in a gaseous mixture is achieved by a chemical, especially amperometric, sensor, that is responsive to the analyte, and a pump-and-valve system, controlled by programmed electronic circuitry, which causes: a) ambient air to pass first through a chemical filter, that removes those air constituents to which the sensor may be responsive, and next through a sorbent-containing tube and the sensor; b) a portion of the gaseous mixture to be first drawn into a sample port and next flushed from the port into the sorbent tube; c) analyte-containing eluent from the sorbent tube to reach the sensor; and d) another mixture component to which the sensor may be responsive to be prevented from reaching the sensor. The sorbent-containing tube has a different retentivity for the analyte than for the other mixture component. The air flow rates and paths can be programmed and the volume of the mixture portion may be auto-ranged to maximize the accuracy of the sensor signals. Speedy analyses of CO in the presence of H.sub.2, of H.sub.2 S in the presence of organosulfur interferences or of other volatiles, such as methanol, methylene chloride or formaldehyde in the presence of interfering compounds of heavier molecular weight are thereby achieved with a portable instrument having improved reliability and relatively low cost.
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Penrose William R.
Stetter Joseph R.
Spitzer Robert
Transducer Research, Inc.
Zaromb Solomon
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