PSA oxygen generator OT-Elite 3L/min Large LCD display Oxygen concentration indicator ... in China (Factory audited by: Bureau Veritas) PSA oxygen concentrator(generator) OT-Elite 3L/minFeatures:*Complies with the requirements of ISO ... Power Failure, High Pressure / Low Pressure, Low Oxygen Concentration, Temperature, Current overload or line surge shutdown, Thermal Switch, 40 psig Pressure ...