--- title: OilGasFlowmeters description: Oil & Gas Thermal Mass Flow Meters. 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Accuracy: +/- 0.5% of reading; high flows up to 60,000 sfpm (0-305 smps) - Very wide 100:1 turndown to handle peak and low flow fluctuations - Use qMix™ software to easily change gas composition in the field and retain accuracy - Measures very low pressure vapors with no pressure loss - Validate in the field for easy in-situ calibration Discover How: Watch Video  [![quadratherm-640i_180x145](https://info.sierrainstruments.com/hubfs/quadratherm-640i_180x145.png "quadratherm-640i_180x145")](https://www.sierrainstruments.com/products/quadratherm/640i.html) ### QuadraTherm 640i Industry's Most Accurate Air/Gas Insertion thermal Flow Meters [Learn more>](https://www.sierrainstruments.com/products/quadratherm/640i.html)     [![quadratherm-780i_180x145](https://info.sierrainstruments.com/hubfs/quadratherm-780i_180x145.png "quadratherm-780i_180x145")](https://www.sierrainstruments.com/products/quadratherm/780i.html) ### QuadraTherm 780i Highest Accuracy Air/Gas Inline Thermal Meter in the Industry  [Learn more>](https://www.sierrainstruments.com/products/quadratherm/780i.html) [![qmix-title_180x145](https://info.sierrainstruments.com/hs-fs/hubfs/qmix-title_180x145.png?width=222&height=190&name=qmix-title_180x145.png "qmix-title_180x145")](https://www.sierrainstruments.com/products/upgrades/qmix.html) ### qMix App Field-Update For Gas Composition Changes [Learn More>](https://www.sierrainstruments.com/products/upgrades/qmix.html) ### Sierra Instruments (Mailing and Shipping Address) Sierra Instruments 5 Harris Court, Building L Monterey, CA 93940 ##### [Other Locations](https://www.sierrainstruments.com/facilities.html) #### Phone Toll-Free USA: 1-800-866-0200 North America: 1-831-373-0200 Europe: +31-72-5071400 Asia-Pacific: +86-21-58798522 #### Languages [Dutch](https://www.sierrainstruments.nl) | [French](https://www.sierrainstruments.fr) | [German](https://www.sierrainstruments.de) | [Chinese](http://www.sierra-asia.com) - 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