Manual controlled mass flow oxygen rebreather
Emerson 1963 9-SO-3 oxygen rebreather
This page describes the brother of the Scuba-lung from Emerson. The identical rebreather distinguishes itself by a different gas dosing system. The 9-SO-3 uses a constant mass flow valve that can be adjusted by hand. The mass flow principle allows a fixed amount of oxygen in the loop. Usually just below the metabolic rate of the diver. By adding a small amount every now and then, the diver will always have enough oxygen. The scrubber and the cylinder are identical to the 9-SO-21.
The manual below describes in detail the working and the composition of this device, launched in 1963.
Therebreathersite was founded by Jan Willem Bech in 1999. After a diving career of many years, he decided to start technical diving in 1999. He immediately noticed that at that time there was almost no website that contained the history of closed breathing systems. The start for the website led to a huge collection that offered about 1,300 pages of information until 2019. In 2019, a fresh start was made with the website now freely available online for everyone. Therebreathersite is a source of information for divers, researchers, technicians and students. I hope you enjoy browsing the content!