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QuadraTherm 640i Thermal Insertion Mass Flow Meter

QuadraTherm 640i Thermal Insertion Mass Flow Meter by Sierra InstrumentsAccurate Air / Gas Thermal Insertion Mass Flow Meter

Sierra Instruments QuadraTherm® 640i is the most accurate insertion-probe thermal mass flow meter for air / gas mass flow rate measurement on the market today, achieving gas mass flow rate accuracy never before possible, +/- 0.75% of reading above 50% of full scale. The QuadraTherm 640i air / gas mass flow meter marks an accuracy breakthrough in thermal dispersion technology achieving extreme precision with "percent of reading" accuracy, which for the first time rivals accuracies of Coriolis technology for measuring gas mass flow rate.

Each QuadraTherm thermal flow meter comes with on board qMix(tm) gas mixing software which allows you to create custom gas mixtures in the field to compensate for gas compositional changes-no costly recalibration needed. Perfect for managing changes in flare gas composition in the field for upstream oil & gas flare gas measuring applications and other applications in which gas composition fequently changes.

  • High accuracy +/- 0.75% of reading
  • DrySenseTM sensor will eliminate drift
  • Field validation allowing easy in-situ calibration
  • qMix software - change gas composition in the field and retainn accuracy
  • Life time sensor warranty
  • Boiler MACT certified 
  • Unique multi-gas flow totalizer and alarmsHigh flows up to 60,000 scfm (305 smps)


QuadraTherm 640i Flow Meter suitable applications

  • Natural Gas Flow Measurement Instruments
  • Compressed Air
  • Precision Measurement & Control
  • Digital Flowmeters & Controllers
  • Waste Water Treatment
  • Flare Gas Measurement


QuadraTherm 640i Thermal Insertion Mass Flow Meter benefits

  • Patented DrySenseTM velocity sensor / "quad" 4-sensor thermal sensor technology 
  • Life time warranty on sensor
  • No moving parts
  • Low pressure drop
  • Ability to change pipe size and gas in the field
  • ValidCal™ Diagnostics: field calibration validation and meter diagnostics to assure operating performance


QuadraTherm 640i  Document Downloads

DOWNLOAD PDF  for the QuadraTherm 640i


Create Custom Gas Mixtures Using qMix for QuadraTherm 640i/780i