The OPTISONIC 7300 ultrasonic flowmeter from KROHNE targets the high requirements of biogas applications. The measuring instrument, which functions according to the time transit differential method, guarantees flow measurement with a high degree of long-term stability regardless of the gas composition. It is maintenance-free and immune to deposits. Thanks to its special signal converter design, it has considerably higher signal strength. The NACE-approved Grade 29 Titanium transducers provide corrosion resistance against hydrogen sulfide. An enhanced digital signal processor allows for better detection of small acoustic signals strongly dampened by high carbon dioxide content. To make various measurements comparable, the standard volume can be measured based on temperature and pressure inputs to the converter. 800/356-9464; www.us.krohne.com.