Patent ID: 7404340
Filing Date: 2008-07-29
Classification: G01M,G01N

Abstract:
1. A transient dilution air control arrangement for controlling a dilution air supply to an inlet of a partial flow dilution tunnel of a gas sampling system, the partial flow dilution tunnel being connected to an exhaust gas stream of an internal combustion engine, the gas sampling system having a first mass flow controller operatively connected to an inlet of the transient dilution air control arrangement, a second mass flow controller connected to an outlet end of the partial flow dilution tunnel and a filter interposed the second mass flow controller and the outlet end of the partial flow dilution tunnel, said transient dilution air control arrangement comprising: a constant mass flow stream; a variable mass flow stream; and wherein said variable mass flow stream is non-collinearly connected with said constant mass flow stream prior to the inlet of the partial flow dilution tunnel.