Cross-sensitivity compensation in electrochemical gas sensors

Testo’s emission measurement technology is renowned for its accuracy and reliability, particularly in monitoring heating systems, combined heat and power plants, engines, and turbines, where gas compositions are generally predictable. However, in processes with variable gas mixtures, managing cross-sensitivity—where sensors respond to non-target gases—becomes critical. Electrochemical sensors, commonly used in Testo instruments, face this challenge due to their limited selectivity, as their catalysts often react with multiple gases. Strategies to minimize cross-sensitivity include careful selection of catalyst materials and electrolytes, applying bias voltage to improve selectivity, and using chemical filters to block interfering gases. Despite advancements, continued improvements are needed for greater accuracy in complex gas environments.