Fluid Components International’s ST Series flowmeters feature rugged, no-moving parts designs suitable for hazardous plant environments requiring biogas capture and recovery systems for power generation and pollution control. The ST51 and ST98 are designed with a precision thermal mass flow sensing element, built-in temperature compensation and advanced transmitter electronics. The ST51 flowmeter is designed specifically to measure biogas, digester gas, and all methane composition gases including natural gas. The ST51 features a thermal mass, insertion-style flow element with flow accuracy to +/-1 percent of reading over a broad flow range from 0.3 to 400 SFPS (0.08 to 122 MPS), and repeatability of +/-0.5 percent of reading. The ST98 flowmeter operates over a flow range from 0.21 to 172 NMPS in air with a standard flow accuracy of +/-1 percent of reading, +/-0.5 percent of full scale. It is a good fit for air/gas flow measurement applications, including natural gas or methane monitoring.