The sampling path, i.e. the way the gas takes from the sampling point in the process to the analyzer, must meet some important requirements. The top priority is to ensure that the gas composition remains unchanged to the highest possible degree.
Unpleasant side effects such as diffusion through lines and fittings as well as deposits or reactions during gas transport must be avoided. The pumps, valves, fittings and tubes should transport the gas with as little pulsation as possible. Heated lines are used to maintain the temperature level so as not to change the composition of the process gas (e.g. the acid dew point).
