For lab researchers and systems integrators/OEMs, Sierra's flagship SmartTrak 100 thermal mass flow controller is a true multi-gas digital MFC designed to deliver smooth, stable, accurate, and repeatable gas mass flow control you can rely on, every time. Unaffected by upstream gas temperature and pressure fluctuations, gas mass flow control with Sierra’s SmartTrak 100 is direct and unequivocal.

Available in any flow range you specify up to 1000 slpm and higher, SmartTrak is CE approved, comes in various sizes, industrial waterproof enclosures, operating pressures and temperatures, and industry form factors.

View: Capillary Tube Thermal Mass Flow Meters & Mass Controllers - A User's Guide  

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Product Benefits
Ideal for OEM, industry and research
Patented, inherently linear Laminar Flow Element (LFE) design, advanced platinum wound capillary sensor 
Mass flow rates up to 1000 slpm; higher upon request
50 slpm (nlpm) version in a small footprint 3 inches long, 1 inch wide, 7 inches tall (76.2 mm, 177.8 mm, 25.4 mm); does not include fitting length
Makes drop-in replacement easy
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
Proprietary frictionless-hovering, direct-acting control/shut-off valve
Precision digital PID valve control; no valve tuning or adjustment
Free user software
Control functions also available from PC via RS-232
Source code for RS-232 communication provided
Compod™ upgrade to run small-scale pilot plants without expense of DCS or PLC system
Enhanced networking capability, including two digital relays, totalization, inputs, and display
Wide range of digital communication protocol options: Modbus, Foundation Fieldbus
Specifications
All clean gases including toxics and corrosives      
High accuracy: +/- 0.5% of full scale
Accuracy: +/- 1% of full scale
Repeatability: +/- 0.2% of full scale
Flow ranges from 0-10 sccm to 0-1000 slpm (nlpm)
Higher and lower flow ranges available
Pressure to 500 psig (34.5 barg)
Gas/ambient temp 32°F to 122°F (0°C to 50 C)                                                           
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Response time: 300ms time constant: 2 seconds (typical) to within ± 2% of final value (includes settling time), faster or slower available upon request
24 VDC power supply
Seals: Viton®, Neoprene®, Kalrez®
316 stainless-steel construction
Analog or digital signals included: RS-232, RS-485 (Multi-drop), 0-20, 4-20 mA; 0-5, 1-5, 0-10 VDC
Digital communications: Modbus RTU
CE approved  640S、620S、780S、Smart Trak 2 100、Max-Trak 180、Smart-Trak 50、Mass-Trak 810C、Top-Trak 822/824、Top-Trak 826/827、Side-Trak 840、Side-Trak 830、Fast-Flo 620S、Steel-Mass 640S、780S、Innova-Mass 240、Innova-Flo 241V