Maximum flexibility for emission measurements on stationary engines.

this minimum amount of oxygen is not sufficient, as the mixing of fuel and air is never perfect, so an excess of air is required, the ratio of which to the stoichiometrically required amount of air is described by the air ratio λ. Too much excess air lowers the combustion temperature, causes energy losses, which reduces efficiency and leads to increased emissions of unburnt hydrocarbons.

Depending on the λ, a distinction is made between engines with a lean mixture (λ > 1) and those with a rich mixture (λ ≤ 1). The process dynamics also require stable ignition and controlled flame. An incorrect setting of the ignition timing can lead to premature ignition, which causes uncontrolled combustion processes with extreme pressure and temperature peaks. This increases the risk of misfiring and cylinder damage and further increases the formation of NOx, as high local temperatures and pressures favour the formation of nitrogen oxides. To minimise NOx emissions, correct ignition adjustment and stable combustion control are essential.

Excessively high CO concentrations indicate incomplete combustion and therefore poor efficiency, which increases fuel costs. High CO values, which can occur during adjustment work, can also damage the CO sensors of gas analyzers. Regular maintenance is therefore crucial to ensure the efficiency of the engine and prevent damage. Every service should include a flue gas measurement of the relevant parameters such as O2, CO and NOx, as they provide information on the functionality and efficiency of the combustion process.

Overall, the following applies: The complex interaction between flue gas parameters, air ratio, ignition adjustment and the combustion process settings forms the basis for optimum performance. High-precision measuring instruments are therefore essential for efficient and low-emission operation in order to reliably monitor and optimize combustion.