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Thermal Gas Mass Flowmeter Technology

Flow meter Power Pro Sensor  

Thermal Gas Mass Flowmeter Technology

Thermal Gas Mass Flow Meters from Fox utilize the thermal sensing principle, a proven, accurate direct mass flow measurement technology. This high-powered sensor technology performs at high levels of accuracy for a wide variety of gases.


Theory of Operation in Gas Flow Measurement Technology

Fox Thermal Flow Meters use a constant temperature differential (constant Δ T) technology to measure mass flow rate of air and gases. Fox's PowerPro™ Sensor, the thermal mass flow sensor, consists of two Resistance Temperature Detectors (RTD’s). The sensor elements are constructed of a reference grade platinum wire wound around ceramic mandrels that are inserted into stainless steel or Hastelloy tubes.

Benefits of Using Thermal Gas Mass Flow Over Other Technologies

There are many benefits of thermal gas mass flow meters over other flow measurement technologies.  Thermal Mass Flow Meters have no moving parts or orifices which eliminate the need to replace bearings and prevents undetected shifts in accuracy. They also don’t require temperature or pressure compensation and provide excellent accuracy and repeatability over a wide range of flow rates. They calculate mass flow, rather than volume, and are one of the few technologies that can measure flow in large pipes.  They are easy to install and come in both insertion and inline styles.  Furthermore, Fox Thermal Instruments offers a wide variety of communication options and NIST-traceable “actual condition” calibrations to suit almost any application.

The thermal mass flow meter is cost effective and accurate making it an excellent choice for a wide variety of gas flow applications.   

For more information on applications, please visit our Applications menu or contact an Application Specialist for your specific needs.

The Fox Difference

Fox strives to design and manufacture high quality and durable thermal gas flow meters for industrial and emissions monitoring applications.  All Fox meters use the Fox PowerPro™ sensor* to measure mass flow rate and the meters are available in insertion and inline models.  Fox models FT3 and FT2A are mass flow meters and temperature transmitters providing isolated 4 to 20mA and pulse output for flow rate, and a 4 to 20mA pulse output for process gas temperature or a second flow rate output.  Please review the product features for Models FT3 and FT2A for further information about thermal mass flow meter products by Fox.

  • Direct mass flow measurement of air and gases in standard volumetric units (ie SCFM or NM3/H) or mass units (ie lbs/m or kg/h)
  • No additional pressure or temperature compensation required
  • Exceptionally broad measurement range, (100 to 1 typical) including very low velocity flow rates
  • Linear 4 to 20 mA output proportional to mass flow rate
  • Linear 4 to 20 mA output for process temperature
  • Low pressure drop
  • No moving parts
  • Insertion and inline configurations
  • Microprocessor based, field rangeable electronics
  • Proprietary Power Pro™ Sensor
  • Measures flow rate and flow total

*standard and high gas temperature range sensors are available.

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