This new line of GHG mass flowmeters (photos, top right) is certified by the manufacturer for compliance with the U.S. EPA’s recent greenhouse gas (GHG) reporting rule (40 CFR Part 98; for more see CE, March, p. 17). Certified mass flowmeters provide an economical way to totalize methane or natural gas burned, enabling the calculation of CO2 equivalent emissions, says the manufacturer. Meanwhile, models are available for producing highly accurate and repeatable results for CH4 as well as N2O, SF6, HFCs, PFCs and CO2, as called out in the EPA mandate. To make it easier for customers facing this measurement challenge, a team of flow application and service engineers has been trained in the EPA’s GHG reporting rule and is available to answer customer questions. — Sierra Instruments, Monterey, Calif.