摘要:
A method for monitoring consumption of at least one consumable in a mass transfer system. The method includes providing at least one accurate mass transfer apparatus configured to provide mass transfer of a gas into a liquid to generate a liquid output, wherein the relative amounts of liquid and gas are set, and for each mass transfer apparatus: measuring the amount of liquid output, and determining, based on the amount of liquid output and the relative amounts of liquid and gas, a quantity of at least one of the gas and liquid consumed in that mass transfer apparatus.