Patent ID: 7201071

Claim:
A wide range continuous diluter for diluting gases that contain small particles to allow subsequent measurement of the diluted gases with an instrument, the diluter comprising: a dilution gas inlet for receiving a dilution gas at a controlled rate; a sample gas inlet for receiving a sample gas; a flow meter for measuring the sample gas flow rate; a mixer connected to the dilution gas inlet and to the sample gas inlet for receiving and mixing the dilution gas and the sample gas at a dilution ratio, the mixer having an outlet for providing a mixture flow at a controlled rate; an instrument flow outlet arranged to provide a well-defined flow into the instrument from the mixture flow; a make-up gas inlet arranged to provide make-up gas into the mixture flow at a controlled rate; and whereby changing the flow rate of the make-up gas causes a responsive change in the sample gas flow rate, thereby allowing continuous adjustment of the dilution ratio.