The contaminants in the exhaust gas emissions from a motor vehicle such as carbon monoxide (CO) and hydrocarbons (HC) are analyzed within a nondispersive infrared analyzer which includes means for assuring that the vehicle being tested has achieved a predetermined engine speed and that no blockage has...http://www.google.es/patents/US4160373?utm_source=gb-gplus-sharePatente US4160373 - Vehicle exhaust gas analysis system with gas blockage interlock
Vehicle exhaust gas analysis system with gas blockage interlock
