Apparatus for a carbon dioxide scrubber and method therefor

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A breathing apparatus of the type in which exhaled gas is passed through a body of re-agent material for removal of at least a proportion of the carbon dioxide content from the exhaled gas prior to or following injection of a determined quantity of oxygen or a mixture of oxygen and other gases to the gas and presentation of the gas for re-breathing. The apparatus comprises an exhaled air treatment system (19) which comprises a cylindrical container (32) having an inner cartridge (39). The inner cartridge contains the re-agent material. The apparatus further comprises a plurality of temperature sensors (70) disposed in or adjacent to the re-agent material for measuring the temperature difference between at least two locations during carbon dioxide removal by the filter. A processor means is provided for determining the remaining carbon dioxide absorbing capacity of the remaining active re-agent material in accordance with the measured temperature difference from the sensors. A method for determining the remaining carbon dioxide absorbing capacitiy of the re-agent material in accordance with the data provided by the sensors (70).