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SideTrak 840 Analog Mass Flow Controller

SideTrak 840 Flow Controller by Sierra InstrumentsProcess Gas Mass Flow Meters & Controllers

The SideTrak® 840 Mass Flow Controller from Sierra Instruments’  has been designed for precise control of air and process gases in ranges from 0 to 10 sccm up to 0 to 500 slpm. This device accomodates most clean gases and corrosives due to it's material construction of 316 stainless steel.

With proven of over 25 years of field installations, the SideTrak product line is distinguished by its patented, cleanable, large-diameter sensor tube and the reliability and serviceability that this feature provides. Because a microscopic layer of contamination has a major effect on small diameter sensor tubes, many mass flow meters and controllers suffer, over time, from degradation of accuracy or repeatability. The SideTrak sensor is not only larger in diameter than most other MFMs and MFCs, but it is mounted along the side of the flow body to provide access ports at either end. In the event of clogging or contamination, it can be cleaned with the 0.03-inch diameter cleaning rod available from Sierra.

Sierra’s SideTrak® sensor also overcomes the problem of zero-drift commonly associated with capillary-type meters and controllers. Because the sensor windings are constructed of platinum, the NIST standard for temperature detection and one of the most stable elements known, the device is virtually drift-free.


  • Electromagnetic servo-control - precise, instantaneous control of gas delivery
  • Speed of response, accuracy and reliability
  • Dependable analog mass flow control for over 30 years
  • Precision control with low pressure drop
  • Proven to control toxics, corrosives and combustible with easy cleanable sensor tube
  • Count on durability with rugged construction
  • Broad range of sizes available

Industries: Analytical / Life Sciences & Health / Automotive / Glass Production / Biopharmaceutical / Life Science 


Benefits of Sierra's SideTrak 840

  • 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

Applications suitable for use

  • Ultra Low Pressure Drop MFC
  • Precision Burner Control for Natural Gas Flow
  • Manufacturing
  • Carrier Gases
  • Chromatography
  • Carrier & Purge Gases

Some of the SideTrak 840 Specifications

  • 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 

SideTrak 840 Specification Sheet Download

To view all the information on the SideTrak 840 by Sierra Instruments you can download the data sheet here 


Flow Type: Gas Flow Meters