COMPACT MINI-TUNNEL TYPE DILUTOR SYSTEM USING WALL AIR ENTRANCE

摘要

The present invention is the measurement of suspended particles contained in the exhaust gas including automobile engines, particle measuring instrument relates to a dilution device for diluting the installation on the front end by the particles, more specifically, the dilution tunnel is formed in the housing, and an ejector nozzle is positioned within the dilution tunnel, and the ejector nozzle is located inside the sampling probe, the external clean dilution air is divided via the manifold inlet passage provided through the rear end to the rear end of one side of the dilution tunnel by an air passage tube, the other end is introduced into the dilution is distributed in the front end to the front end of the tunnel inlet, through the sampling probe relates to a mixture consisting of the measurement so that the particles entering the wall air inlet tunnel expression compact mini diluter. ; In particular, the present invention relates to a dilution to ensure you have the correct dilution ratio is molar, with minimal loss of the particle when the particle is in an unstable release of the high concentration can not be measured only by measuring the particle counter or particle common cause The invention To this end, the mass flow control device to supply clean air to flow in the correct position at the front end and rear end groups the dilution air introduction wall surface expression mixed uniformly without losing the particles with clean air using a small particle tunnel the other hand, by using an electric heater provided with means to prevent the deformation of the particles according to the mixture inside the tunnel have the constant temperature gradient abrupt temperature change. ; Thus vagrant mass control, wall air inlet expression loss and deformation of the small particle by a dilution tunnel and is composed of an electric heater, while minimizing operating method is simple, can have the correct dilution ratio.