Patent ID: 6941230

Claim:
Procedure for the determination of the quality of gas of a probe gas, proceeding from a transmission spectrum of the probe gas determined at operating conditions by means of spectroscopical methods of measurement, comprising determining at operating conditions out of the transmission spectrum the amounts of substances x i of the components of the probe gas, presetting default values for a compressibility factor K and real gas factor Z n for calculation of the compressibility factor K, out of quantities at operating conditions of the probe gas as well as from the amounts of substances x i and substance specific quantities and taking into account of the preset default values for compressibility factor K and real gas factor Z n determining input quantities for the determination of the compressibility factor K, calculating with these input quantities the compressibility factor K by means of a standard-arithmetic procedure, and carrying out an iterative calculation in the way of an iterative recalculation of the input quantities with the determined value for the compressibility factor K, until the value of the compressibility factor K converges and then from the volumetric standard calorific value H v,n , the standard density ρ n is calculated.