draeger dolphin mass flow controlled scr

Constant mass flow ( often called: active scr ) semi closed circuit design is the simplest type of recreational rebreather.
Constant flow of fresh premix gas into the breathing loop, flow rate based on premix gas and definite greater than the diver´s metabolic oxygen consumption. The overpressure valve vented to much gas out of the loop. Constant mass flow regardless of depth.
MOD based on premix gas.
There are several popular units on the market: draeger´s ray and dolphin, omg`s azimuth.