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Mass Flowmeters

Precision Measurement for All Gas, Liquid and Steam Applications

Sierra designs and manufactures a wide range of gas mass flowmeters across three core technologies: capillary thermal, immersible thermal, and vortex technology:
  • Capillary thermal mass flow meters deliver accurate direct mass flow ideal for research & industrial applications typically with lower flow rates.
  • Immersible thermal mass flow meters give accurate direct gas mass flow measurement from low to high flows for compressed air, natural gas, N2 and methane to name a few in a variety of industrial applications.
  • Mass vortex is ideal for steam and saturated steam applications, but it can also measure gas and volumetric water.
Choose your capillary thermal, immersible thermal or mass vortex flowmeter below.

Capillary Thermal Meters

For research and general industry, our SmartTrak line of gas flowmeters and gas mass flow controllers (MFCs) offers direct mass flow measurement with the largest breadth of products: multi-gas, high pressure, low pressure drop, ability to measure corrosives, and small footprint.

Immersible Thermal Mass Flow Meters

How much compressed air are you producing and using? Is your boiler operating as efficiently as possible? What’s your natural gas flow rate? For effective flow energy management applications, like compressed air and natural gas measurement, thermal mass flow meters give you the answers with the highest accuracy +/- 0.5% of reading, stable Dry Sense sensor technology, in situ field calibration, and software app to easily integrate across all platforms. 

We offer localized and global support, commissioning, and lifetime support. Learn More

Vortex Flow Meters

Sierra’s mass vortex flow meters can be specified to measure up to five process variables with one process connection: volumetric flow, mass flow, density, pressure, and temperature. Vortex technology is ideal for steam flow measurement and volumetric water. Available in both inline and insertion versions, with easy hot tap feature for large steam pipes. Software apps make it easy to set up and tune your meter for your application.

FAQs

Q: What is mass flow?

A: In most processes with flowing gases such as air, N2, or methane, it is gas mass—not gas volume—that is the critical variable. Volumetric flow measurements are less reliable than mass flow measurements because changes in gas temperature and pressure will change the density of a fixed volume of gas.

In the control process, additional errors can be propagated by back pressure changes in the process. Unlike orifice plates, rotameters, variable area (VA) meters, differential pressure (DP) meters, turbine meters and all other volumetric flow devices, thermal mass flow meters and controllers are relatively immune to changes in inlet temperature and pressure. Since these instruments directly measure molecular flow (count gas molecules), they provide the most reliable, repeatable and accurate method for delivering gases from a supply volume to a process at a desired mass flow rate.

Q: How does a capillary thermal mass flowmeter work?

A: The total flow through a tube or piping system enters the CTFM, where it passes through a Laminar Flow Element (LFE).This creates a pressure drop across it, and in turn, a small amount  of flow, typically in the sccm range, is fractioned off of the total flow and passes through the capillary flow sensor. With a good LFE, this ratio of flow through the sensor and flow through the LFE remains constant.

How It Works: Watch Mass Flow Controller Video

Q: How do I size my vortex flowmeter?

A: To properly configure your vortex flowmeter, you need to know type of fluid; type of gas, liquid or steam; pipe size, including type, nominal size and schedule; process conditions, such as flow rate, temperature and pressure. Use our InnovaMass sizing tool to configure your vortex flowmeter today.

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SmartTrak®100

Premium Digital Mass Flow Controllers and Mass Flow Meters

  • Direct mass flow with thermal technology +/- 0.5% full scale accuracy
  • True multi-gas digital mass flow controller
  • View and change every aspect of the instrument
  • Small footprint at 50 slpm ideal for OEMs
  • 10-point NIST calibration on primary standards
MicroTrak® 101

Ultra Low-Flow Gas Mass Flow Meters & Controllers

  • Measure and control flow rates down to 0.1 sccm (smlm)
  • Increase efficiency with true, digital high-performance
  • Navigate easily with large multifunction display interface
  • Save time by making adjustments in the field
  • Configure up to 10 gasses with one instrument
FastTrak® 730

Fast-Response, Ultra-Stable Mass Flow Meter

  • Fast 200 millisecond response to changes in flow rate
  • Field-proven ultra-stable glass/ceramic flow sensor
  • Small footprint for in-line bodies at ¼ inch to ¾  inch
  • Water-resistant NEMA 2 enclosure (indoor applications only)
  • Low pressure loss
TopTrak® 820

Economical 800 Series Mass Flow Meters

  • Proven gas flow measurement with affordable OEM pricing
  • For fast delivery, buy online, next-day shipment
  • Save money with volume discounts
  • Read results easily with large tiltable display
  • Easy drop-in replacement with compact size
  • Available in economical nylon, stainless steel and aluminum
SmartTrak® 50

Low-Cost Digital Mass Flow Controllers & Mass Flow Meters

  • OEM pricing with digital high-performance
  • Small footprint at 50 slpm ideal for OEMs
  • 10-point NIST calibration on primary standards
  • Large display to view flow information easily
  • Choice of construction in aluminum or 316 stainless-steel
MaxTrak® 180

Industrial Mass Flow Controller

  • Meet industrial MFC requirements  with NEMA 6 & IP67 ratings
  • Increase efficiency with true, digital high-performance
  • Make adjustments in the field for time savings
  • Configure up to 10 gasses with one instrument
SmartTrak® 100 HP

Ultra-High Pressure Gas Mass Flow Meters & Controllers

  • Powerful high-pressure measurement and control up to 5000 psig (345 barg)
  • Proven accurate mass flow control with high-pressure calibration facility
  • Guaranteed high-pressure performance with high-impact, carbon-enforced valve seat
  • Make adjustments in the field with pushbutton display
  • Flexible Integration with a wide range of digital communication protocols
MassTrak® 810

Economical Digital Mass Flow Controllers

  • Record flow measurement at affordable OEM pricing
  • Save money with volume discounts
  • Read results easily  with large LCD readout
  • Accurate mass flow control even with low pressure drop
  • Save time with built-in local setpoint control
ChlorineTrak 760S

Cost-Effective Chlorine Gas Mass Flow Meters Made From Kynar

  • Cost-effective solution for chlorine injection market
  • Offers corrosion-resistant Kynar flow body at economical price
  • Rugged, no drift DrySense Hastelloy sensor
  • Validate in the field
  • Backed by lifetime sensor warranty
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
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 >?
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
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 
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
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
MultiTrak 670S

Multi-Point Gas Mass Flow Meters for Large Ducts and Stacks

  • Compensates for flow profile changes with up to 4 sensor points
  • Exceeds in applications with non-uniform flow profiles, low pressure drop, high turndown
  • Eliminate drift with patented DrySense™ sensor
  • Manage multiple inputs with easy-to-use touchscreen HMI display interface
  • Backed by lifetime sensor warranty
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 >
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
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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