The Model 311TC and 311XL Portable Trace Oxygen Analyzers provides complete oxygen analysis in a compact package. With high accuracy and fast response, this unit is FM approved intrinsically safe for use in Class I, Division 1, Groups B, C, and D.

The 311TC offers four switch selectable ranges as low as 0-10 ppm plus a cal range allowing for calibration in ambient air. Power is supplied by rechargeable NiCad batteries.

The 311XL and 311TCXL (BASEEFA certified) provide analysis in decade steps ranging from 0-2 to 0-10,000 ppm full scale. CENELEC approved versions of the 311 are available.