公开(公告)号：CA1063382A

公开(公告)日：1979-10-02

申请号：CA322541

申请日：1979-03-01

Applicant: BECKMAN INSTRUMENTS INC

Inventor： SAWA KENNETH B ,  PEEK WILLIS M ,  BLANKE JOHN D

IPC: F02D41/14 ,  G01N1/22 ,  G01N27/00 ,  G01N27/407 ,  G01N33/00 ,  G01N27/02 ,  G01N27/08 ,  G01R27/22

Abstract: In apparatus for analyzing the exhaust gas of a motor vehicle, the apparatus including an oxygen sensor and means for sampling a portion of the exhaust gas and conducting the sample to the sensor, there is disclosed an improvement wherein the exhaust gas is used to heat a moisture barrier and the oxygen sensor and is then cooled before being directed through the moisture barrier to the sensitive area of the oxygen sensor. This arrangement prevents moisture form condensing on the sensitive area of the oxygen sensor, which moisture would interfere with the operation of the sensor.