Documents and Resources Please browse our manuals – downloadable pdfs. Series 2510 Series 2520 Series 2500 Zirconia Oxygen Analyzer (ZrO2000) OXY-SEN Series 3500 Series 2000 Series 3520 Series 3000 Series 3510 Series 9610 Series 9600 Series 860 Series 800, 850 Series S9510 Series 1000 Series 1300