... :0.3, 1:0.5, 1:0.7, 1:1.0, 1:1.5, 1:2.0, 1:2.5, 1:3.0, ... 1:3.5, 1:4.0 ... N2O four-tube flow meter2) Low flow rate: 0.1-2L/min3) High flow rate: 2.5- ... continuously adjusted to assure the O2 concentration above 25%7) Safety performance: a) Alarm for oxygen supply ... /min9) Gas supplies: a) O2: 0.3-0.4MPab) N2O: 0.3-0.4MPaVaporizer:1) The standard configuration is 1 ...