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Mass Flow Controllers & Meters for Gases

Application Flexibility for General Industry, Laboratory and OEM

SmartTrak mass flow controllers and mass flow meters provide researchers, systems integrators, and OEM's with high-performance gas flow control and measurement for nearly any application requirement:

  • High accuracy, primary standard calibration
  • Smallest footprint by flow range
  • Multi gas to specify any gas, any flow range up to 1000 slpm (nlpm)
  • Local/remote display and pushbutton interface
  • Free user interface software app
  • Digital and analog capability
  • Smart configurator online, ships next day
  • Custom engineering at no extra cost
  • Lifetime support by our global engineering team 

Choose Your Application:

Get the Thermal Mass Flow Advantage

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's thermal mass flow controllers are true digital MFCs based on thermal mass flow technology which directly measures molecular flow (counts gas molecules). Unaffected by upstream gas temperature and pressure fluctuations like other differential pressure devices, digital gas mass flow control provide the most reliable, repeatable, and accurate gas mass flow for a variety of gases including natural gas, air, nitrogen, and argon.

How Does a Digital Mass Flow Controller Work?

Digital mass flow controllers automatically control a specific gas flow rate at a given set point 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 operate on the capillary thermal principal of operation which 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 and splits the flow into two flow 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 difference in temperature 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 communicates all the data the control valve needs to actively control the given set point. Watch Video

Gas Mass Flow Calibration Services

Quality Calibration: SmartTrak’s NIST traceable accuracy is backed by our 10-point, primary standard calibration over the entire flow range.  SmartTrak has a strong and flexible control valve with accessible PID valve tuning to assure 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 mass flow meters and controllers in-house, Sierra provides all necessary software and training and even the flow calibration standards required for the job.

Special Pricing: We work with you to meet budget requirements and cost targets.  Ask about OEM volume discounts. Shop Now

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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

SmartTrak 100

  • 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

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® 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
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 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
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
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
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
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

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