Digital Mass Flow Controllers & Meters

Application Flexibility for General Industry, Laboratory and OEM

Over 80% of all industrial processes—such as those involving chemical reactions, combustion, respiration, and HVAC—are based on mass flow, not volumetric flow. Sierra Instruments' thermal mass flow controllers are true digital MFCs based on thermal mass flow control technology that directly measures molecular flow by counting gas molecules.

Digital mass flow meters are unaffected by upstream gas temperature and pressure fluctuations like other differential pressure devices. This feature allows them to provide the most reliable, repeatable, and accurate gas mass flow for various gases, including natural gas, air, nitrogen, and argon.

Key features of Sierra’s digital mass flow controllers include: 

  • Accurate and repeatable flow measurement: Digital mass flow controllers measure down to the gas molecule, providing accurate and repeatable measurements.

  • Compact footprint: Sierra’s digital mass flow controllers offer the smallest footprint by flow range.

  • Multi-gas flexibility:  Specify any gas, any flow range up to 1000 slpm (nlpm). 

Choose Your Application:

More About Digital Mass Flow Controllers

SmartTrak controllers and mass flow meters provide researchers, systems integrators, and OEMs with digital mass gas flow control and measurement for nearly any type of application requirement.

  • Measure mass flow instead of volumetric flow, providing more accurate readings and improved measurement and control
  • Sierra’s controllers feature local/remote display with push button interface, plus access to a free user interface software app

Additional Features

  • Localized and Global Support: Sierra’s experienced team operates out of more than 150 locations and can provide sales, installation, calibration, and other services no matter where you’re located.

  • Commissioning: Product specialists are available for installation and any other commissioning services you might need.

  • Lifetime Support: Sierra offers support and calibration services for the lifetime of your product.

Digital Gas Mass Flow Control FAQ

Q: How Does a Digital Mass Flow Controller for Gases Work?

A: A digital mass flow controller automatically controls a specific gas flow rate at a given set point. Control is based on direct mass flow, not volumetric flow.

Direct thermal mass flow controllers offer customers direct mass flow without pressure or temperature equipment or flow computers. Direct mass flow meters and mass flow controllers count and control every gas molecule flowing through the instruments and are immune to changes in process temperature or pressure. Digital mass flow controllers for gases operate on the capillary thermal principle of operation. This principle is based on heat transfer and the first law of thermodynamics.

During operation, the process gas enters the inlet of the instrument’s flow body. The flow is split into two paths. The vast majority of the gas flow passes through the Laminar Flow Element (LFE) bypass. A very small portion of the total flow is diverted through a small “capillary” sensor tube with an ID between .007 to .028 inches, which has an upstream and downstream RTD.

As the gas flows through the capillary sensor, the temperature profile shifts downstream, which is measured by the RTDs. The temperature difference is measured by digital electronics and converted to a mass flow signal. This signal is directly proportional to the total mass flow through the mass flow controller. The capillary sensor of the digital mass flow controller communicates all the data the control valve needs to actively control the given set point.  Discover The Swiss Army Knife of Mass Flow Controllers

Q: What Calibration Options are Available for Sierra's Digital Mass Flow Controllers?

A: Whether you want to take advantage of our industry-leading calibration services or calibrate your meters in-house, Sierra Instruments can support all your calibration needs.

Quality Calibration: SmartTrak’s NIST traceable accuracy is backed by our 10-point, primary standard calibration over the entire flow range.  SmartTrak digital gas mass flow meters have a strong and flexible control valve with accessible PID valve tuning.

These features assure the best speed and reliability. Custom valve orifice sizing yields full-range stability.  If you need something special, Sierra customizes often free of charge.

DIY Calibration: If you prefer to calibrate your own digital flow meters and gas controllers in-house, Sierra provides all necessary software and training and even the flow calibration standards required for the job.

Digital Mass Flow Resources 

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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

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

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
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

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

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°)

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