Turbine flowmeter

volumefor gasDN25 - 1"

The Roots gas flow meter is a high-precision gas flow instrument based on the volumetric measurement principle. At its core are a pair of precision-machined “8”-shaped Roots (waist-shaped) rotors that rotate in opposite directions within the metering chamber, driven by the flowing gas. With each complete rotation, the rotors expel four fixed-volume “gas chambers,” enabling highly accurate, continuous volumetric measurement of the gas. Owing to its unparalleled precision, repeatability, and long-term stability, it has become the preferred standard and legal metrology instrument for trade settlement in sectors such as city gas and natural gas transmission and distribution. Product Advantages The core value of the gas Roots flowmeter lies in its ultimate precision, rugged durability, and exceptionally long service life—all engineered for trade fairness. 1. Trade-grade ultra-high accuracy: Achieves accuracy grades as high as ±1.0%, maintaining exceptional measurement precision across an extremely wide flow range (wide turndown ratio). This minimizes trade disputes and ensures fairness for both buyers and sellers. 2. Ultra-Low Start-Up Flow & Wide Turndown Ratio: Exceptionally sensitive to minute flows with minimal start-up requirements. Achieves a turndown ratio up to 1:100 or higher, precisely measuring fluctuations from minimal to maximum flow rates. Effectively prevents “unaccounted-for gas” losses from leaks, spills, or drips. 3. Exceptional repeatability and long-term stability: Repeatability error better than ±0.2%. Robust mechanical construction ensures high long-term operational stability with extended calibration intervals (typically 6-8 years),