THE MESO SNIFFER: A DEVICE AND METHOD FOR ACTIVE GAS SAMPLING USING ALTERNATING FLOW

WIPO Patent Application WO2001030497

A3

A sampling system for detecting an analyte, comprising a diaphragm pump, a buffer chamber, a sensor head and intake port. The pump includes a chamber for receiving fluids via first and second ports. A buffer chamber is located at the second port for holding a quantity of air, and a sensor head is adapted to identify the presence of a desired analyte and produce a signal in response to the quantity identified. Preferably the diaphragm pump has a volume of gas per stroke capacity slightly larger than the volume of the sensor head such that the pump chamber has a greater volume than the buffer chamber and the buffer chamber has about the same volume as the sensor head. A sensor intake port intakes a sample potentially containing the analyte for contact with the sensor head upon operation of the diaphragm pump and out of the sensor head by jet-action caused by rapid movement of the diaphragm pump. A filter may be used for filtering air drawn through the pump chamber. The diaphragm pump may be either a single chamber pump or a multiple chamber diaphragm mesopump. In the purging mode, the system can also contain a pump for filling the system with cleaned air. When a mesopump is used, a single pumping channel can provide both AC and DC operation.

ZOOK DAVID J
CABUZ CLEOPATRA

PCT/US2000/029435

January 17, 2002

October 26, 2000

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HONEYWELL INC (US)

F04B45/047; G01N1/24; G01N33/00; G01N1/00; (IPC1-7): G01N33/00; G01N1/24; G01N1/26; F04B43/04; F04B43/00

WO1994019609A1	1994-09-01
WO1997029283A1	1997-08-14

US5836750A	1998-11-17
EP0372429A2	1990-06-13
EP0816677A2	1998-01-07
US5180288A	1993-01-19
CH579418A5	1976-09-15

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