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1. (WO2018122562) GAS DETECTION APPARATUS COMPRISING A GAS CHROMATOGRAPHY COLUMN

Pub. No.:    WO/2018/122562    International Application No.:    PCT/GB2017/053905
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Sat Dec 30 00:59:59 CET 2017
IPC: G01N 30/28
G01N 30/88
G01N 33/00
G01N 1/02
Applicants: ION SCIENCE LIMITED
Inventors: DEAN, William
STOCKDALE, Mark
Title: GAS DETECTION APPARATUS COMPRISING A GAS CHROMATOGRAPHY COLUMN
Abstract:
An apparatus is disclosed for detecting a target gas in ambient air. The apparatus comprises a GC column (118), a sensor (126) located downstream of the GC column (118), a pump (110), a gas storage chamber (114) and a pneumatic circuit. The pneumatic circuit has two states. In a first state, the pump (110) draws in ambient air and supplies it to the gas storage chamber (114) in order to store ambient air under pressure within the chamber (114), while trapping a sample of ambient air within the pneumatic circuit. In the second state the gas storage chamber is connected to the GC column to cause pressurised air drawn from the storage chamber (114) to act as a carrier gas to advance the trapped sample through the GC column and the sensor. A filter (116) is provided to filter out any target gas present in the air entering into, or the air drawn from, the storage chamber (114), so as to avoid the presence of any target gas in the carrier gas.