公开(公告)号：US3593023A

公开(公告)日：1971-07-13

申请号：US3593023D

申请日：1969-03-27

Applicant: BECKMAN INSTRUMENTS INC

Inventor： DODSON MICHAEL ,  GOMEZ RAYMOND J

IPC: G01M15/10 ,  G01N1/22 ,  G01N21/35 ,  G01N33/00 ,  G01N21/26 ,  G01N31/00

CPC classification number: G01M15/108 ,  G01N1/2252 ,  G01N1/2258 ,  G01N21/3504 ,  G01N33/0011 ,  G01N2001/2261 ,  Y10T436/205831

Abstract: An apparatus and method for determining the content of certain constituents in hot gases, such as the exhaust of motor vehicles or the like. The exhaust gas is conveyed by a pump to an air cooled condenser to lower the temperature of the gas to essentially ambient temperature and thus condense water vapor therein. The gas is then heated to a temperature above said ambient temperature while being conveyed from the condenser through a conduit to a sample cell of a radiant energy analyzer so that water vapor in the gas passing through the conduit and cell will not condense upon the walls thereof. The cell is positioned above a water trap in the condenser a distance sufficiently great so that no water in the trap will be carried into the cell by the flow of gas passing through the apparatus. The gas is preferably conveyed through the apparatus by means of a jet pump connected to an outlet port on the cell. The jet pump embodies a restriction at its outer end to provide automatic pressure regulation in the apparatus so that the gas pressure in the sample cell will remain relatively constant regardless of pressure fluctuations in the air supply that drives the pump.