ST75 mass flowmeter

The ST75 mass flowmeter is designed to measure fuel gases, specialty gases, and pneumatic air flow in gas compressors. It is available for line sizes from 0.25 in. to 2.0 in. (6–51 mm), and provides three distinct outputs: mass flowrate, totalized flow, and media temperatures. The ability to gather such data enables compressor operators to evaluate compressor performance and make adjustments to maximize operating efficiency and reduce costs. The ability to compare the performance of multiple gas compressors also supports predictive maintenance, since higher flowrates often indicate leaking valves or seals. The ST75 includes temperature compensation to ensure performance under variable process and plant temperature conditions. The device operates over a wide flow range, from 0.01 scfm to 559 scfm (0.01–950 ncmh), and offers accuracy to ±1% of reading and ±0.5% repeatability. Its precision flow element has no moving parts; rather, its platinum resistance temperature detector (RTD) sensors are embedded in equal-mass thermowells with microprocessor electronics that can be calibrated to laboratory standards for CO2 and other gases.