Both the Inspiration and Evolution with Vision electronics utilise the same oxygen control program as the Classic Inspiration – an oxygen controller which was developed specifically for APD and has set new standards for Sport and Military rebreathers in terms of holding and maintaining the PO2 close to the target pressure (setpoint) in all phases of the dive.

It features a variable inject time depending on the variance of the O2 level from the chosen setpoint: the further from the setpoint, the longer the oxygen valve opens. So even during fast ascents or periods of high workload, the controller is easily able to maintain the setpoint without manual intervention by the diver. The APD oxygen controller is unique among closed circuit systems in that it holds the O2 pressure at the mouthpiece within an extremely tight tolerance band – typically ± 0.02 bar.