06855557 is referenced by 5 patents and cites 107 patents.

A detection system for detecting contaminant gases includes a converter, a detector, a primary channel for delivering a target gas sample through the converter to the detector, and at least two scrubbing channels for delivering a reference gas sample through the converter to the detector. Each of the scrubbing channels includes a scrubber for removing basic nitrogen compounds from the reference gas sample, while the primary channel preferably transmits the target gas sample without scrubbing. The converter converts gaseous nitrogen compounds in the target gas sample to an indicator gas, such as nitric oxide (NO), and a control system directs the flow of a gas sample among the primary channel and the scrubbing channels. In accordance with one aspect of the invention, the basic-nitrogen-compound concentration can be measured by comparing the concentration of the indicator gas detected in the reference sample with the detected indicator-gas concentration in the target sample. The use of multiple scrubbing channels enables the detection to operate continuously since each scrubber can be alternately purged while another is scrubbing.

Title
Detection of base contaminants in gas samples
Application Number
9/783232
Publication Number
6855557 (B2)
Application Date
February 14, 2001
Publication Date
February 15, 2005
Inventor
William M Goodwin
Medway
MA, US
Oleg P Kishkovich
Greenville
RI, US
Agent
Weingarten Schurgin Gagnebin & Lebovici
Assignee
Extraction Systems
MA, US
IPC
G01N 033/00
G01N 037/00
G01N 035/08
G01N 021/00
G01N 031/12
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