Optimal control of fruit ripening

A new photoacoustic sensor from smartGAS measures the concentration of the ripening gas ethylene in the ambient air of ripening warehouses with high precision, therefore enabling compliance with stringent quality regulations in the fresh produce sector.

A basic prerequisite for the precise control of the ripening process is high-precision measurement of the C2H4 concentration throughout the entire supply chain. A time-proven measuring principle is nondispersive infrared (NDIR) absorption. As a specialist for gas sensors smartGAS has long offered reliable and durable NDIR gas sensors for measuring numerous gases, including the plant hormone ethylene. In the future the smartGAS product portfolio will be expanded to include an innovative sensor. The PAS sensor is based on the measuring principle of photoacoustic spectroscopy (PAS), which enables high-precision measurements in the dynamic minimum range. The new PAS sensors measure ethylene concentrations in a range from 5 to 1,000 ppm with a precision tolerance of 1 percent of the measured value ±1.5 ppm. The sensor module is designed to automatically control all processes and components, which eliminates the need for an external controller. The PAS sensor features very low zero point drift (<1.5 ppm in 24 h) and automatically compensates the water vapour cross-sensitivity to coefficients of influence below 5 ppm.

For more information about the PAS sensor and other gas sensors and their applications, please visit or contact us directly. As your point of contact, we will be glad to assist you with any questions.