The ST51 Air & Gas Flow Meter provides a greenhouse gas monitoring solution and supports the EPA's BACT initiative. The product features a no-moving parts design that is non-clogging and operates over a wide flow range with low-flow sensitivity. It is packaged with an explosion-proof transmitter, with the calibration matched to the user's actual gas composition and installation conditions. The unit features a thermal mass, insertion-style flow element with flow accuracy to ±1% of reading over a broad flow range from 0.3 to 400 SFPS and repeatability of ±0.5 percent of reading. The flow element is available for use in line sizes from 2 to 24 in.