Continuous emissions monitoring system (CEMS) for high-range stack measurements. Synspec Delta 116 is a continuous emissions monitoring system (CEMS) built specifically for high-range stack measurements according to US EPA 25A. The analyser provides the sum of all other hydrocarbons in the same measurement cycle for better determination of the total air pollution. The method utilised ensures that the instrument does not only measure the concentrations of the greenhouse gas methane but simultaneously presents the sum of all other hydrocarbons, even the ones that are usually difficult to detect such as oxygenated hydrocarbons.