thermal mass flow controller / for gas / digital
SmartTrak® 140 Sierra Instruments



  • Technology:

    thermal mass

  • Fluid:

    for gas

  • Other characteristics:


  • Flow rate:

    Max.: 500 l/min (132 us gal/min)

    Min.: 0 l/min (0 us gal/min)

  • Pressure:

    500 psi


When you need premium high-performance mass flow control, but require the absolute lowest possible pressure drop, think SmartTrak 140. The 140 controls up to 500 slpm with an ultra-low ΔP of 4.5 psid (310 mBard—much better than typical ΔP values of 25 psid (1700 mBard) for equivalent mass flow controllers on the market. Accuracy and application flexibility result from:

A patented, inherently linear Laminar Flow Element (LFE) design
Advanced platinum-wound capillary sensor technology
Proprietary frictionless-hovering control valve

For lab researchers and systems integrators/OEMs, the SmartTrak 140 thermal mass flow controller is a true multi-gas digital MFC designed to deliver smooth, stable, accurate, and repeatable gas mass flow control with extremely low pressure drop. Unaffected by upstream gas temperature and pressure fluctuations, gas mass flow control is direct and unequivocal.

Product Benefits

Ideal for applications with a tight pressure budget
Valve has large flow coefficient (Cv) for precise control at low ΔP
User-friendly pilot module display interface is front-mounted, hand-held or remote mounted
Field adjustment with multifunction pilot module display interface. Change the following:
Measured gas
Flow rate
Engineering units
Set zero, span and full scale for each gas independently
Primary Standard Calibration & NIST traceability
10 pre-programmed gases come standard; substitute up to 9 more