Built under a patented UOP design, the COSA/Xentaur Continuous Hydrogen Analyzer (CHA) provides petroleum refiners, petrochemical producers, and electric power generators a means to continuously and accurately monitor hydrogen concentration in gaseous streams. With its unique electrochemical sensor, the CHA outputs a continuous signal corresponding directly to the hydrogen concentration. Used in conjunction with real-time controls, alarms, and shut-off mechanisms, this instrument responds immediately to changing hydrogen levels for improved operations and safety.