Patent ID: 6878339
Filing Date: 2005-04-12
Classification: B01D,G01N,Y02A,Y10T

Abstract:
1. A NOx-concentration measuring apparatus for quantitatively analyzing the concentration of NOx contained in a sample gas, comprising: a sampling probe for obtaining the sample gas; a drain separator for condensing moisture contained in the sample gas as a condensed water and separating the condensed water from the sample gas, said drain separator having a cooling device therein for cooling the sample gas; an NO a secondary cooling device for additionally cooling the sample gas; and an NO analyzer, arranged in above stated order with respect to a sample-gas line of said NOx-concentration measuring apparatus, wherein said drain separator is operable to cool the sample gas passing therethrough at a high flow velocity such that a ratio of the flow rate (cm the sample-gas line between said sampling probe and said drain separator is heated and/or thermally insulated over the entire length thereof.