TopTrak 820 Ecomonical 800 Series Mass Flow Meters from Sierra Instruments

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 prices below that of a typical rotameter
  • Large tiltable display that can be mounted on the device or on a remote panel
  • Large cleanable sensor tube for use with dirty gases

Ask about OEM volume discounts on pricing to meet your budget requirements. For fast delivery, buy online and get next-day shipment.


  • Proven gas flow measurement with affordable OEM pricing
  • For fast delivery, buy online, next-day shipment
  • Save money with volume discounts
  • Read results easily with large tiltable display
  • Easy drop-in replacement with compact size
  • Available in economical nylon, stainless steel and aluminum

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


  • Most gases; check compatibility with wetted materials
  • Accuracy: +/- 1.5% of full scale
  • Repeatability: +/- 0.5% of full scale
  • Nylon version to 50 slpm (nlpm) maximum
  • Aluminum version to 175 slpm (nlpm) maximum
  • Stainless-steel version 500 slpm (nlpm) maximum
  • Response time: 800ms time constant
  • Pressure: Stainless-steel version to 500 psig (34.5 barg) maximum; Aluminum and Nylon versions to 150 psig (10 barg) maximum
  • Gas/ambient temperature 32 to 176 °F (0 to 80 °C), all versions
  • 15 VDC, 24 VDC power supply
  • Wetted materials: 10% glass-filled Nylon® 6/6; 316 stainless-steel
  • Seals: Viton, Neoprene, Kalrez, Teflon
  • Analog signals included: 4-20 mA; 0-5 VDC
  • CE approved