... O2≤0.1Mpa,N2O cut-off is activated Backup power when AC power fails, the power switch over to internal battery which will run ... ,Spontaneous, Mechanical CMV,etc. I:E ratio 1:1~1:9.9(Reversed I:E optional) Ventilation Frequency:6~40 cycles/min ... high, Apnea, O2% low,O2% high, battery low, batter insufficient Power filure. Anaesthesia Machine