Patent ID: 6546818
Filing Date: 2003-04-15
Classification: G01N,Y10T

Abstract:
A method of measuring a gas mixture comprising:(i). receiving a sample gas from a source at a predetermined sample gas flow rate; (ii). supplying a gas mixture to a detector at a predetermined detector supply gas flow rate; (iii) receiving a detector signalling produced by a detector monitoring the gas mixture supplied by step (ii); (iv) periodically comparing the received detector signalling to a predetermined range; (v) mixing a supply of diluting gas with a portion of the sample gas flow to supply the gas mixture at the predetermined detector supply gas flow rate of step (ii) to maintain the received detector signalling within the predetermined range; whereby the sample gas received in step (i) is received at a predetermined sample gas flow rate and the gas mixture supplied to the detector is supplied at a predetermined detector supply gas flow rate.