Gas mass-flow meters (GMFM) for original equipment manufacturers (OEM) applications are presently found in a relatively easy and cheap way. GMFM may be applied in a number ofdifferent situations but technical formation concerning its principles of measurement andapplications are still misleading.In this paper, the principles of GMFM measurement are discussed and the operatingparameters are clarified. A concept of gas mass-flow response factor is introduced andfurther used in a model for gas mass-flow measurement that is suitable to any gas mixture of known composition.In addition, a model for the application of GMFM to dynamic volumetric methods of dilution is presented and generalized.
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