In this paper, a methodology for assessing the explosiveness of hydrocarbon gases combined with hydrogen is proposed. The methodology is based on the measurement of heat released during gas mixture burning in the catalytic sensor. A multi-stage heating profile with different duration and voltage amplitude was developed to divide the catalytic sensor response for hydrogen and hydrocarbons in the mixture. The advanced data processing of experimental data was used to calculate the heat released. The methodology does not require the identification of the gas, their quantity and concentration.