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DOWNLOADGas Flow Meters & Mass Controllers
Accurate Mass Flow Measurement
Sierra designs and manufactures a wide range of today's most advanced analog and digital gas flow meters, mass flow meters, mass controllers and switches across three core technologies: Capillary Thermal, Immersible Thermal, and Mass Vortex. Each gas flowmeter or gas controller meets exacting standards for gas flow control, and we can also customize your flow rate sensor to meet application requirements (often free of charge).
Choose your gas flow meter below.
Learn more about Gas Flow Measurement, by reading these Gas Flow Meter FAQs
Q: How do I select the right digital gas flow meter for my application?
A: Selecting the right flow meter depends on several factors, including pipe size, flow rate,gas being measured, temperature and pressure of the gas, and whether the flow rate needs to be local or remote. View our Gas Flow Chart for more information on selecting the best MFC for your application.
Q: How do thermal flow meters work?
A: An industrial thermal mass flow meter measures either the mass velocity at a point in aflowinggas, or the total mass flow rate through a channel or pipe. Learn more about thermal mass flow meter technology used to measure gas flow more efficiently. Watch the video to learn more about How Thermal Mass Flow Meter Technology Works.
Q: What is mass flow rate?
A: Simply put, the mass flow rate is the WEIGHT of the sample, while the volumetric flow rate is the SIZE of the sample.
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). Read the following article to learn more about how our mass flow meters and controllers can help with Tuning Your Boiler for EPA Boiler MACT Compliance.
Still not sure what gas flow meter type is right for your gas application? Contact the flow solution experts at Sierra today.
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Measure Flare Gas in Real Time
QuadraTherm® qMix RealTime
Flare Measurement System
- Meet EPA rule 40 CFR 63-measure flare gas down to 0.1 sfps (0.03 smps) where ultrasonic flow meters can't operate
- Handles upset conditions at ultra-high flows with wide 1000:1 turndown
- Easy to install with current ultrasonic flow meters-no process shutdown
- Use qMix RealTime App to connect, read, and update new flare gas composition from a GC-real time, no recalibration needed
- Set update frequency by time or by percentage change in the gas composition
- Get flow and composition trend analysis, flow alarming and triggers
BioTrakTM 645S/745S
Wastewater Thermal Mass Flow Meter
- Direct mass flow measurement maintains precise control of aeration, digestion, and cogeneration
- Microprocessor based, field-programmable electronics
- Wide measurement range up to 1000:1 turndown; 100:1 typical
- DigiSense sensor design / Swivel probe ±180° into four positions
- BioSelect™ menu provides field selectable air, methane, and digester gas
- BioView™ software provides access to meter data / Configure meter settings in field
- BioCal™ verifies calibration within five minutes
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
RedyIndustrial
Water Resistant Industrial OEM Thermal Mass Flow Meters & Controllers
- Meet industrial OEM mass flow control requirements with NEMA 6 & IP67 ratings
- ATEX Certification (Category 3 / Zone 2 & 22)
- Increase efficiency with accurate and reliable flow control
- Competitive OEM pricing- cost-effective solution
- Ideal for washdown environments
- No-drift sensor warranty
RedySmart®
The Ultimate OEM / MFC
Lifetime No-Drift Sensor Warranty
- Ultimate OEM MFC-modular, compact footprint, connect power cable & communication system
- MEMS sensor stability- Lifetime no-drift sensor warranty
- Direct mass flow with thermal technology- no temp or pressure compensation
- Precision electromagnetic valve control
- Competitive OEM pricing- Cost-effective solutions
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.
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
RedyCompact®
Compact Mass Flow Meters & Regulators- Perfect VA Replacement
- Direct Mass Flow, not volumetric, for highest accuracy & repeatability
- High-precision MEMS technology: No-drift (lifetime warranty) CMOS sensor
- Compact Footprint for easy drop in replacement to VA meters
- Regulate flow with high resolution manual setpoint
- Battery operated, with large, easy-to-use touchscreen display, automatic screen adjustment (0°/90°/180°/270°)
BioTrak™ 645i/745i
Wastewater Dedicated Thermal Mass Flow Meter
- Field-Selectable Gases-air, methane, digester gas
- Direct mass flow measurement maintains precise control of aeration, digestion, and cogeneration
- Accuracy: Air: +/-1% of reading +/-0.2% of full scale - Other gases: +/-1.5% of reading +/-0.5% full scale
- Insertion and inline versions
- AC or DC power input available
- Optional hot top packing gland and retractor
- Integral and remote electronic configurations available
- Wide measurement range up to 1000:1 turndown; 100:1 typical
- BioCal Calibration Validation within five minutes
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
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®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
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
- 5-point NIST calibration on primary standards
- Large display to view flow information easily
- Choice of construction in aluminum or 316 stainless-steel
TM500™
High Performance Industrial Thermal Mass Flow Meter
- Accuracy
- +/- 1.0% of reading plus +/- 0.2% of full-scale – Air, Nitrogen
- +/- 1.5% of reading plus +/- 0.5% of full-scale – All other gases
- Repeatability +/- 0.2% of full scale
- Direct measurement of gas mass flow / No volume to mass calculations
- DigiSense™ robust sensor design
- AC or DC power
- Use optional Gas-Mix™ feature to easily change gas selection or create gas mixes in the field - no recal required
- 2-3 week delivery lead times / 1 week delivery possible
TM100™
Economical Industrial Thermal Mass Flow Meters
- Accuracy
- +/- 1.0% of reading plus +/- 0.2% of full-scale – Air, Nitrogen
- +/- 1.5% of reading plus +/- 0.5% of full-scale – All other gases
- Repeatability +/- 0.2% of full scale
- Direct measurement of gas mass flow / No volume to mass calculations
- DigiSense™ robust sensor design
- 12 to 24 volt DC power
- Use optional Gas-Mix™ feature to easily change gas selection or create gas mixes in the field - no recal required
- 2–3-week delivery lead times / 1-week delivery possible
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
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
InnovaSwitch™ Flow Switch
Flow Switch for Precision Detection of Liquid / Gas Flows
- Ultra-sensitive with fast response time
- Ideal for industrial pump protection
- 1-year warranty
- Unique high temperature up to +458°C
TopTrak® 820
Economical 800 Series Mass Flow Meters
- Proven gas flow measurement with affordable OEM pricing
- 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
InnovaMass® 241S Insertion
Vortex Flow Meters
- Insertion probe for pipes and ducts up to 72 inches (2M); Optional hot tap - no process shutdown
- Ideal for saturated or superheated steam, gas, and liquid
- Volumetric flow rate or mass flow
- Multivariable for five measurements in one device
- Energy (BTU) Monitoring for real-time monitoring of energy consumption
- Highly reliable with no moving parts
- Loop power option available
- Rugged, long-lasting design for the industrial applications
InnovaMass® 240S Inline
Vortex Flow Meters
- Highly reliable with no moving parts
- Ideal for saturated or superheated steam, gas, and liquid
- Flexibility with volumetric or multivariable versions
- Multivariable for five measurements in one device
- Energy (BTU) Monitoring for real-time monitoring of energy consumption
- No leaks with all welded gasket-free flow body
- Loop power option available
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
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 >
- Meet EPA rule 40 CFR 63 for flare gas measurement at ultra-low flows down sfps (0.03 smps) with QuadraTherm® qMix RealTime Flare Measurement System (FMS)
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 >
- Meet EPA rule 40 CFR 63 for flare gas measurement at ultra-low flows down sfps (0.03 smps) with QuadraTherm® qMix RealTime Flare Measurement System (FMS)
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
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