Application requirements
In 'the old days', before using any kind of flow control solution, Ossett Brewery could only control the flow of oxygen into their system by the simple use of opening the valve on the gas cylinder and then time how long they dose the oxygen into a beer brewing vessel. This rough estimation could cause inconsistency with each batch with over- or under-oxygenation.
The solution they were looking for has to supply oxygen accurately over a well-defined period of time. Furthermore, the solution should be robust enough to be able to operate in an environment with gases as well as liquids.