SmartTrak 50 – Economical OEM Digital Mass Flow Controller

Low-Cost Digital Mass Flow Controllers & Mass Flow Meters

Sierra Instruments’ SmartTrak® 50 Series is a digital gas mass flow controller designed to meet the low-cost budgetary requirements of OEM’s while maintaining excellent quality and performance. Inspired by the need for accurate and reliable gas mass flow control at an OEM price, the 50 Series delivers by building on the same core sensor, LFE and valve technology found in our award-winning SmartTrak 100 Series, all backed by industry best off-the-shelf fast product delivery and Sierra’s style of personalized customer support. Our 50 Series has a standard accuracy of +/- 1.0% of full scale. The flexible and powerful direct-acting control valve sets it apart from the competition by minimizing leak-by, while offering a 300 ms response time to setpoint changes at +/- 0.25% repeatability.


  • Accuracy: +/- 1.0% full scale for common gases (Air, Ar, CO2, CO, CH4, He, H2, O2, N2)
  • Repeatability: +/- 0.25% full scale
  • All the performance features of a digital mass flow controller at an OEM price
  • Control gas mass flow rates to 50 slpm (nlpm) (Low Flow) 200 slpm (Medium Flow)
  • Advanced 316L SS platinum sensor technology and patented LFE provide excellent linear
  • Available in both aluminum and 316 stainless steel flow bodies with Viton® elastomers
  • Local display and digital setpoint control with optional analog setpoint/output signals
  • RS-232 interfaces easily with PLC or workstation (user software and communication cables supplied)
  • RS-485 (addressable)

Product Benefits

  • Ideal for OEM, industry and research
  • Patented, inherently linear Laminar Flow Element (LFE) design, advanced, platinum-wound capillary sensor
  • Mass flow rate up to 200 slpm (nlpm); higher upon request
  • Choice of aluminum or stainless-steel construction
  • Compact size makes drop-in replacement easy
  • Local display and digital setpoint control
  • Optional analog setpoint/output signals
  • Field adjustable zero and span
  • Primary Standard calibration & NIST traceability
  • Proprietary frictionless-hovering, direct-acting control/shut-off valve
  • Precision digital PID valve control; no valve tuning or adjustment
  • Free user software
  • RS-485 (addressable)
  • I/O DB9 comm ports on each side of enclosure for installation flexibility
  • Control functions also available from PC via RS-232
  • Source code for RS-232 communication provided

SmartTrak 50 Low Flow – PDF

SmartTrak 50 Medium Flow – PDF