Chemistry: analytical and immunological testing – Nitrogen containing – Oxides of nitrogen
Patent
1993-09-03
1994-10-25
Redding, David A.
Chemistry: analytical and immunological testing
Nitrogen containing
Oxides of nitrogen
436106, 436114, 436117, 436118, 422 52, 422 83, G01N 2176
Patent
active
053588746
ABSTRACT:
An NO.sub.x analyzer capable of reducing maintenance operations for removing solid substances from the analyzer, and for obtaining an analytical value of improved reliability for sample gases flowed through the analyzer is provided. A sample gas supply passage on the downstream side of an NO.sub.x convertor is provided with a first capillary therein; a sample gas supply passage between the first capillary and the NO.sub.x convertor is provided with an overflow passage having a second capillary branch connected therewith; a sample gas supply passage on a downstream side of the first capillary is provided with a diluent air supply passage having a third capillary therein and also branch connected with the sample gas supply passage. At least the confluence of the first capillary, the second capillary, and the diluent supply passage with the sample gas supply passage is arranged within a heating zone of the NO.sub.x analyzer.
REFERENCES:
patent: 3652227 (1972-03-01), Harmon, III et al.
patent: 4863691 (1989-09-01), Noguchi et al.
Horiba Ltd.
Redding David A.
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