Sierra Instruments, Inc.

- Custom Packaged Thermal Mass Flow Sensors

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North America's #1 selling thermal mass flow sensor(Flow Research, Boston MA) can be integrated into your end product package as a thermal mass flow sensor probe or probe / electronics set.  Tell us the length of the insertion mass flow sensor probe and we will make it to your exact specification.

The sensors used in our 640S and 620S thermal mass flowmeters are often customized for customers needing just a raw sensor mass flow output signal or as a raw sensor electronics set.  We will calibrate the sensors to your specification or we can show you how to calibrate the flow meter sensor at your facility.

Get the benefits of our patented DrySense sensor guaranteeing long-term stability backed by a lifetime warranty.

OEM Probe Only Thermal Sensors

  • Mass flow sensor probes to fit your OEM needs
  • Wide flow range from 0 to 20,000 sfpm
  • Increase flexibility with low pressure drop
  • Turndown: 1000:1 
  • Patented DrySense™ sensor
  • Backed by lifetime sensor warranty

Our thermal sensors are ideal for:

  • Air volume flow metering
  • Compressed air flow
  • Aeration basin air flow
  • Combustion air flow
  • Natural gas fuel flow
  • Custody transfer
  • Stack gas emissions flow monitoring

Wide variety of options:

  • Wide range of process connections
  • High temperature option 750°F (400°C)
  • Self-cleaning purge for dirty flow environments
  • Axial probe design for dirty flow environments
  • Longer probe lengths
  • Multipoint flow averaging arrays for very large ducts

  • Measure all inert gases and all non-condensing clean gases
  • Flammable gases: methane, propane, hydrogen, digester gas, natural gas
  • Corrosive gases compatible with 316L stainless steel
  • Accuracy: +/- 1% of reading
  • Repeatability: +/- 0.2% of full scale
  • Two probe diameters to choose from:
    • 3/8-inch (9.5 mm) sensor probe up to 24 inches (61cm) 
    • 3/4-inch (19.1 mm) sensor probe up to 72 inches (2 m)
  • Wide flow range from 0 to 20,000 sfpm
  • Turndown: 100:1 
  • CE Approved

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