... oxygen outlet pressure above 7 psig (50kPa)*Low sound level below 42dBA (standard type:3, 4, 5L/min)*Low adsorption pressure ... (about 0.15 Mpa)*Alarms: power failure, high and low pressure temperature, low oxygen concentration*Information ... BSafety Alarms & Features Power Failure, High Pressure / Low Pressure, Low Oxygen Concentration, Temperature, Current overload or line ...