Flow Meter Home > Flow Meters by Pipe or Duct Size - 1 to 12 inch | Sierra Instruments

1.0 to 12 inch (25 to 304mm)

Tube, Pipe, Duct Size

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QuadraTherm® 640i

Industry's Most Accurate Air / Gas Thermal Insertion Mass Flow Meters

  • Achieve high accuracy +/- 0.75% of reading
  • Eliminate drift with patented DrySense™ sensor
  • Validate in the field for easy in-situ calibration
  • Use qMix software to easily change gas composition in the field and retain accuracy; Download Flare Gas Mass Measuring Tech Note
  • Backed by lifetime sensor warranty
  • Boiler MACT certified for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD), Learn more > 
  • Part of Sierra's Big-3 iSeries family of flow meter technologies, Learn more >
QuadraTherm® 780i

Highest Air/Gas Mass Flow Measurement Accuracy in Industry

  • Achieve the highest accuracy +/- 0.5% of reading
  • Eliminate drift with DrySense sensor
  • Reduce straight-run requirements with built-in flow conditioning
  • Needs only 1-diameter up and zero downstream diameters
  • Validate in the field for easy in-situ calibration
  • Backed by lifetime sensor warranty
  • Boiler MACT certified for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD), Learn more > 
  • Part of Sierra's Big-3 iSeries family of flow meter technologies, Learn more >
FlatTrak 780S-UHP

Industry-Choice For Bulk High Purity Gas Custody Transfer To Semicon Fabs

  • Optimized for bulk ultra high purity (UHP) gas custody transfer
  • Direct mass flow measurement
  • No moving parts, 100:1 turndown, low pressure drop
  • Reduce straight-run requirements with built-in flow conditioning
  • Validate in the field for easy in-situ calibration
FlatTrak 780S

Inline Thermal Mass Flow Meters with Flow Conditioning

  • Reduce straight-run requirements with built-in flow conditioning
  • Eliminate drift with DrySense sensor
  • Needs only 3-diameters up, zero downstream
  • Validate in the field for easy in-situ calibration
  • Backed by lifetime sensor warranty
FlowTrak

Optimize Flow Profile For Best Accuracy

  • Creates uniform flow profile at economical price
  • Maximizes flow measurement accuracy in constrained piping environments
  • Reduce upstream and downstream diameters
  • Proven Dual-Plate technology
OEM Probe Only Thermal Sensors

Custom Packaged Thermal Mass Flow 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
BoilerTrak 620S-BT

Insertion Thermal Mass Flow Meter for Boiler & Heater Efficiency

  • Optimized natural and propane measurement for 1, 2, 3, 4 inch sch. 40 pipe sizes
  • Wide flow ranges from 0 to 42,000 scfh
  • Easily install in the field or retrofit
  • Certified for GHG measurement meeting EPA (40 CFR Part 98)
  • Boiler MACT certified for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD) Learn More
  • Fast delivery—ships next-day from stock 
InnovaMass® 240S Inline

Vortex Flow Meters

  • Highly reliable with no moving parts
  • Flexibility with volumetric or multivariable versions
  • No leaks with all welded gasket-free flow body
  • Loop power option available
SteelMassTM 640S

Insertion Gas Mass Flow Meter

  • Insertion, totalizing air/gas mass flow meter
  • Eliminate drift with patented DrySense™ sensor
  • Increase flexibility with low pressure drop, high turndown
  • Validate in the field for easy in-situ calibration
  • Backed by lifetime sensor warranty
InnovaSwitch Flow Switch

Flow Switch for Precision Detection of Liquid / Gas Flows

  • Ultra-sensitive with fast response time
  • Ideal for industrial pump protection
  • Buy online, next-day shipment
  • 2-year workmanship warranty
  • Unique high temperature up to +458°C
InnovaSonic®207i

Ultrasonic Liquid Flow Meter With Thermal Energy/BTU Capability

  • High accuracy transit-time ultrasonic technology
  • Software apps for ease of installation & diagnostics
  • Optimized for thermal energy/BTU measurement
  • Clamp-on sensors, no pipe cutting, no shutdown
  • Real-time liquid density compensation
  • Upgrade meter firmware and software in the field
  • Part of Sierra's Big-3 iSeries family of flow meter technologies, Learn more >
InnovaSwitch Level Switch

Level Switch for Precision Detection of Liquid Level

  • Triggered on level change of 0.8 mm
  • Ideal for tank leak detection
  • Great for truck and railcar loading
  • Buy online, next-day shipment
  • 2-year workmanship warranty
FastFlo 620S

Fast-Response Insertion Thermal Mass Air Flow Sensor

  • Increase efficiency with fast response time within 200 milliseconds
  • Optimized air, nitrogen, and inert gas measurement for 1, 2, 3, 4 inch sch. 40 pipe sizes
  • Wide flow ranges from 0 to 42,000 scfh
  • Easily install in the field or retrofit
  • Fast delivery—ships next-day from stock
InnovaMass® 241S Insertion

Vortex Flow Meters

  • Insertion probe for pipes and ducts up to 72 inches (2M); Optional hot tap
  • Highly reliable with no moving parts
  • Loop power option available
  • Rugged, long-lasting design for the industrial applications
  • For fast delivery, buy online, next-day shipment
InnovaSonic®210

Portable Clamp-On Ultrasonic Flow Meter for High Accuracy Liquid Metering

  • Easy setup in five minutes or less
  • Portable clamp-on transducers measure liquid flows nearly anywhere
  • Save time with no pipe cutting or process shutdown
  • For fast delivery, buy online, next-day shipment
  • Rent or Rent-2-Own programs
  • Boiler MACT certified for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD) Learn More
InnovaSonic®203

Economical Clamp-On Ultrasonic Water Flow Meter for Accurate Results

  • High performance at an affordable price
  • Simply clamp-on outside of pipe for easy set up
  • Save time with no pipe cutting or process shutdown
  • For fast delivery, buy online, next-day shipment
  • Flexible rent or Rent-2-Own programs
InnovaMass® 240i Inline

iSeries Next Generation Vortex Flow Meters

  • Pipe sizes from 1.0 to 8.0 inches (DN25 to DN200)
  • Ideal for saturated or superheated steam, gas, and liquid applications
  • Mass and/or volumetric flow rate
  • Multivariable for five (5) measurements in one compact device
  • Latest iSeries Raptor II™ OS flow engine
  • Complete suite of digital communications
  • Certified for Boiler MACT measurement meeting EPA regulations for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD), Learn more > 
  • Part of Sierra's Big-3 iSeries family of flow meter technologies, Learn more >
InnovaMass® 241i Insertion

iSeries Next Generation Vortex Flow Meters

  • Insertion probe up to 72 inches (2M); optional hot tap
  • Ideal for saturated or superheated steam, gas, and liquid 
  • Volumetric flow rate or mass flow 
  • Multivariable for five measurements in one device
  • Complete suite of digital communications
  • A variety of Apps for ultimate field flexibility
  • Buy online for next day shipping
  • Certified for Boiler MACT measurement meeting EPA regulations for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD), Learn more > 
  • Part of Sierra's Big-3 iSeries family of flow meter technologies, Learn more >

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