Acid dosage
Making it even more accurate
In sample gas coolers, the moisture contained in the sample gas is precipitated in the form of condensate. This also affects the components of the sample gas that have an affinity for water, such as SO2. When the condensate forms on the surface of the cooled heat exchanger, these would want to bind to the water ions, which would lead to a falsified measurement as a result. To minimise the possibility of the gas components docking to the condensate, diluted phosphoric acid is added to the sample gas before it enters the heat exchanger. In this way, the docking sites are already occupied, so to speak, and the gas components enter the measuring cell of the analyser almost unaltered.