Patent ID: 8511141

Claim:
A device comprising: an analysis block defining a first portion of a chamber; a dilution block defining a second portion of the chamber; a first orifice at the first portion for withdrawing gas from the chamber in response to a suction applied at the first orifice; a second orifice at the second portion to modify passage of a sample gas entering the chamber in response to the suction; a third orifice at the second portion to modify passage of a dilution gas entering the chamber in response to the suction; and a fourth orifice at the first portion to modify passage of ozone gas entering the chamber in response to the suction; wherein a partial pressure of the sample gas within the chamber, a partial pressure of the dilution gas within the chamber, and a partial pressure of the ozone gas within the chamber is maintained based only on a respective restriction provided by the second orifice, the third orifice, and the fourth orifice.