Gasboard-3520 integrates NDIR, TDLAS, TCD, and ultrasonic sensors for continuous real‑time analysis of natural gas and hydrogen blends. It outputs gross/net calorific value, Wobbe index, density, compressibility factor (Z), and full gas composition. Compared with conventional gas chromatographs, it requires no carrier gas or combustion gas, eliminating complex auxiliary systems and reducing maintenance costs.