Sierra Instruments’ SideTrak 840 Analog Mass Flow Controller

Get accurate, reliable mass flow control with SideTrak® 840 analog mass flow meter and controller. This traditional mass flow meter:

  • Features precise primary standard calibration to measure any gas with low pressure drop
  • Accurately measures oxygen, mixtures, toxics, corrosives, combustibles
  • Is widely used in process control, leak detection and gas distribution

The 840 flow meter has proven to be one of the world’s most dependable flow controllers for over 30 years.


  • 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

Product Benefits

  • Ideal for general industry applications
  • Large straight capillary sensor tube is cleanable with needle and provides low pressure drop
  • Mass flow rates up to 500 slpm (nlpm), higher upon request
  • Pressure drop 30 psi (2.1 bar), pressure drop of 4.5 psid (310 mBard) available with MicroTrak 101
  • Primary Standard Calibration & NIST traceability
  • Available in wide variety of enclosures, process connections, input/output options and control electronics
  • Proprietary frictionless-hovering direct-acting control/shut-off valve
  • 316 stainless steel construction


  • All gases including toxics and corrosives
  • Accuracy: +/- 1% of reading
  • Repeatability: +/- 0.5% of full scale
  • Mass flow ranges from 0 to 10 sccm to 0-500 slpm (nlpm)
  • Higher and lower flow ranges available
  • Pressure up to 500 psig (34.5 barg)
  • Gas/ambient temperature: 32 °F to 176 °F (0° to 80 °C)
  • Response time: 300 millisecond time constant; 2 seconds (typical) to within ± 2% of final value over 20 to 100% of Full Scale
  • 15 VDC power supply
  • Seals: Viton®, Neoprene®, Kalrez®, Teflon®
  • 316 stainless-steel construction
  • Analog signals included: 4-20 mA; 0-5 VDC
  • CE approved

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