Filter assembly for gas analyzer

A filter assembly for an exhaust gas analyzer comprising:

• a housing including first, second, and third filter cavities, a first inlet passage and first and second outlet passages;
• said first inlet passage being in fluid communication with said first filter cavity and further having means for connection to a source of exhaust gas;
• said first filter cavity having means for supporting therein a substantially coarse filter for filtering particulate matter and for separating liquids;
• said second filter cavity having means for supporting therein a substantially fine liquids filter for filtering liquids;
• said second filter cavity being operatively positioned with respect to said first filter cavity to drain liquid from said first filter cavity;
• said first outlet passage providing fluid communication from said second filter cavity for removal of condensate therefrom;
• said third filter cavity having means for supporting therein a substantially fine gas filter for filtering the exhaust gas;
• said third filter cavity being operatively positioned with respect to said first filter cavity to receive gases filtered therefrom;
• said second outlet passage being in fluid communication with said third filter cavity and having means for connection to a pump for removal of filtered gas therefrom;
• said filter cavities further being shaped so as to minimize void volume in said filter cavities and passages;
• said third filter cavity further being substantially frusto-conically shaped having an inner and outer surface defining an internal, substantially frusto-conically shaped region for disposal of said substantially fine gas filter, and
• said housing further having first, second, and third apertures therein in connection with said first, second, and third filter cavities for removal of said filters from said filter cavities.