Do Rebreathers keep a constant pO2?
Mostly. First you must always remember that there are many different ways to make a rebreather. Semi-closed units do not keep constant pO2’s. Fully closed units make every attempt to keep a constant pO2 by monitoring the oxygen partial pressures with galvanic sensors and then adding only enough O2 to maintain a set point. Military specs are a pO2 of .7, most other rebreather divers usually use a set point from 1.2 to 1.6.
