TopTrak 822/824 – Sierra Economical Thermal Mass Flowmeter

Economical 800 Series Mass Flow Meters

Sierra Instruments’ TopTrak® 820 Mass Flow Meter is designed to replace volumetric flow rate devices at a comparable installed cost. No temperature or pressure corrections are required, as in the case of most other flow monitoring devices, such as rotameters, turbine meters or critical orifices. Available in flow ranges from 0 to 10 sccm up to 0 to 50 slpm, TopTrak is suitable for any clean gas flow measurement application. Wetted surfaces are rugged 316 stainless steel, nickel plating, 6/6 reinforced Nylon® and Viton® “O” rings; all are corrosion-resistant. The 820 measures and displays the mass flow rate directly in sccm or slpm. The integral instrument display is tiltable over 180° for easy viewing and can be removed for remote panel mounting. A 0 to 5 VDC or 4 to 20 mA output signal linearly proportional to gas mass flow rate is provided for recording, data-logging or control. This device is widely used in a variety of flow validation and calibration applications-by dozens of instrument OEMs and in a multitude of laboratory, test and analytical operations.


The TopTrak® 800 series provides an economical OEM gas mass flow meter in your choice of nylon, aluminum or stainless steel.

  • Direct mass flow rate measurement with the nylon version at a very competitive price.
  • Large tiltable display that can be mounted on the device or on a remote panel
  • Large cleanable sensor tube for use with dirty gases

Product Benefits

  • Ideal for OEM and general industry applications
  • Choice of nylon, aluminum or stainless-steel construction
  • Large, tiltable display readout
  • Compact size makes drop-in replacement easy
  • Mass flow rates up to 500 slpm (nlpm) for stainless-steel version
  • Stainless-steel version has large cleanable sensor tube for use with dirty gases


                                                                                                                         TopTrak 822/824 Datasheet – PDF

                                                                                                                   TopTrak 822s/824s Datasheet – PDF