The OPTISONIC 7300 biogas ultrasonic flowmeter from KROHNE has been designed to measure dry and wet biogas with variable composition. It provides additional functions such as calculation of standard volume, methane content measurement and diagnostics features. It has no moving parts and no pressure loss. The measuring tube is made of 316L stainless steel, and the transducers are made of NACE-approved grade 29 titanium for maximum corrosion resistance. The flowmeter is certified for use in explosive areas and is available in line sizes of 2, 3, 4, 6 and 8 inches. 800-356-9464; www.krohne.com