Flow Meter Home > Products > Gas > Gas Meters

Gas Flow Meters & Controllers

Accurate Gas Flow Measurement

Sierra designs and manufactures a wide range of today’s most advanced analog and digital gas flow meters, mass flow meters, controllers and switches across three core technologies: Capillary Thermal, Immersible Thermal and Mass Vortex. Each gas flow meter meets exacting standards, and we can also customize your flow sensor to meet application requirements (often free of charge).

Choose your gas flow meter below.

Boiler MACT Certified

Flow meters for gas measurement are also ideal for compliance for Boiler MACT regulations for inlet fuel measurement for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD). Learn More.

Get the accuracy you need for measuring the flow of gas. Choose your premium digital flow meter or controller today.

Flow Meter FAQs

Q: How do I select the right gas flow meter for my application?

A: Selecting the right flow meter depends on several factors, including pipe size, flow rate information, and whether the flow rate needs to be local or remote. View our Thermal Mass Flow Meter Selection Chart for more information.

Q: How does a thermal flow meter work?

A: An industrial thermal mass flow meter measures either the mass velocity at a point in a flowing gas, or the total mass flow rate through a channel or pipe. Learn more about thermal mass flow meter technology. Watch the video.

  • View by:
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
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 
CalTrak®XL

Primary Standard High-Flow Gas Flow Calibration

  • Begin to calibrate up to 1500 slpm
  • Replace bell provers or sonic nozzle arrays
  • Bring ± 0.15% of reading accuracy to the factory floor
  • Quick, easy-to-use, automatic data capture 
  • Results directly traceable to NIST
CalTrak®500

Accurate Gas Flow Calibration Primary Standard

  • Accuracy of up to ± 0.35% of reading gas mass flow rate
  • Calibrate your flow instruments, save money and time
  • Quick, easy to use, automatic data capture 
  • Portable and battery operated
  • Results directly traceable to NIST
CalTrak®800

Highest Accuracy Gas Flow Calibration Primary Standard

  • Highest accuracy of ± 0.15% of reading gas mass flow rate
  • Broad flow range from 0.5 sccm up to 100 slpm
  • Quick, easy to use, automatic data capture 
  • Portable and battery operated
  • Results directly traceable to NIST
qMix™ Gas Mixing Feature

Field-Update For Gas Composition Changes

  • Powerful, gas mixing software to create custom gas mixtures in the field
  • Per meter license gives unlimited custom gas mixtures and uploads per meter serial number
  • Maintain flow meter accuracy if gas composition changes
  • No need to send unit back to the factory if gas composition changes
  • Avoid costly recalibration
SmartTrak® 50

Economical 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 aluminum or 316 stainless-steel construction
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
Compod™ Upgrade

Make Your Digital MFC Network Enabled And Much Much More!

  • Upgrade new or existing SmartTrak
  • Monitor functionality, faults and system upsets
  • User programmable control module
  • Daisy-chain multiple devices
  • Make your own mini process control system
SmartTrak® 140

Ultra-Low Pressure Drop Mass Flow Controller

  • Meet requirements for ultra-low pressure with ΔP of 4.5 psid (310 mBard)
  • Improve efficiency with true, digital high performance
  • Navigate easily with large multifunction display interface
  • Make adjustments in the field for time savings
  • Configure up to 10 gasses with one instrument
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
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
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
  • 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
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
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 setpoint control
TopTrak® 820

Ecomonical 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
SideTrak® 840

Analog Mass Flow Controller

  • Dependable analog mass flow control for over 30 years
  • Precision control with low pressure drop
  • Proven to control toxics, corrosives and combustibles with easy, cleanable sensor tube
  • Count on durability with rugged construction
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
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
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
SmartVO™

Precision Gas Flow Control Valves

  • Proprietary frictionless-hovering direct-acting control valve
  • Operate over a wide pressure differential range
  • Many choices of fitting and elastomers
  • Aluminum and 316L stainless steel
  • Available with valve control package and power supply
  • For fast delivery, buy online, next-day shipment
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
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

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
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
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® 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
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 >

We're sorry, your filter request has no results. Please try again.