초록 ▼

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 th

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.

대표청구항 ▼

[What is claimed is:] [1.]a detector that detects a concentration of an indicator gas in a gas sample;a primary channel that delivers a target gas sample to the detector;a plurality of scrubbing channels for delivering a reference gas sample to the detector, wherein each of the scrubbing channels in

[What is claimed is:] [1.]a detector that detects a concentration of an indicator gas in a gas sample;a primary channel that delivers a target gas sample to the detector;a plurality of scrubbing channels for delivering a reference gas sample to the detector, wherein each of the scrubbing channels includes a scrubber for removing basic nitrogen compounds from the reference gas sample; anda converter coupled to the primary channel and to the scrubbing channels for converting gaseous nitrogen compounds in the gas samples into the indicator gas before the gas samples reach the detector.