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Designed to meet the requirements of ASTM G85 annex A4, this optional accessory provides a chamber mounted dispersion tube, through which SO2 gas can be introduced, at a rate determined by the user adjustable control valve, and monitored by an SO2 gas flowmeter. The gas can be switched on and off automatically, at user programmable times. For completeness, the operation of the salt spray components and systems of the chamber, are also described below. This is because SO2 gas dosing is usually undertaken during salt spray testing.