Calorific value measurement enables the precise recording of the energy content of gas and provides central data on calorific value, heating value and volume flow. In our FAQs, we explain how modern measuring systems from RMG Messtechnik work, which measuring principles are used and how the measured values are integrated and monitored in industrial systems. We also cover typical sources of error, standards, calibration, areas of application and the contribution of calorific value measurement to energy optimization.