Mass Flow Meter with Display - TopTrak® 822

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Economical Analog Mass Flow Meters

Our TopTrak® MFM directly measures the mass flow rate of gases in flow ranges from 0-10 sccm up to 0-50 slpm. The Model 822 and Model 824 are for measurement of air and ALL inert gases & mixtures. Both models serve a wide range of inert gas flow applications including process control, flow research, instrument OEMs, gas panels, and cell culture maintenance.

In addition, both models offer standard 0-5 VDC or 4-20mA output signals. Our Model 822 is equipped with a large tiltable LCD readout available in your choice of engineering units. The LCD readout can be mounted on the instrument or on a remote panel. Our Model 824 is a compact OEM configuration that comes without the LCD readout. Sierra’s Platinum Sensor Technology to eliminate zero-drift and create excellent long-term reliability is utilized in the design of both Models.

TopTrak® 822 Mass Flow Meter with Display

TopTrak® 822 Mass Flow Meter with Display

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Sierra Instruments Warranty & Support

Limited Warranty - Product - Liability for Repair and Replacement Only

All Sierra products are warranted to be free from defects in material and workmanship and will be repaired or replaced at no charge to Buyer, provided return or rejection of product is made within a reasonable period but no longer than one (1) year for calibration and non-calibration defects, from date of delivery. To assure warranty service, customers must register their products online on Sierra’s website. Online registration of all of your Sierra products is required for our warranty process. Register now at http://www.sierrainstruments.com/register. 

This warranty does not cover any damage or discoloration caused by corrosion due to gases, liquids, or any other source, nor does it cover normal wear of any seals in its products and with gases other than air, or unless otherwise specified in the contract. Such returns are contingent on Sierra's examination and reasonable satisfaction that any defects are covered by this warranty and that the Buyer has not returned the equipment in a damaged condition, due to any negligence, tampering, misapplication or product modification on the part of the Buyer or his agents. Sierra shall not be liable for installation charges, for expenses of Buyer for repairs or replacement, for damages from delay or loss of use, or other indirect or consequential damages of any kind.

Sierra extends this warranty only to Sierra products properly used and properly installed for the particular application for which intended and quoted, and this warranty does not cover products which have been modified without Sierra's approval or which have been subjected to unusual physical or electrical stress, alteration, or tampering, or upon which the original identification marks have been removed or altered. Whenever the design of the equipment to be furnished or the system in which it is to be incorporated originates with the Buyer, Sierra's warranty is limited specifically to matters relating to furnishing Sierra equipment free of defects in materials and workmanship and Sierra assumes no responsibility for implied warranties of fitness for purpose or use. Any replacement or repair shall be to Sierra's factory, unless otherwise directed. No items shall be returned for warranty repair without prior written authorization from Sierra.

Note: Sierra’s InnovaSwitch™ Flow Level Switches come with a two (2) year warranty with the above stipulations. 

Lifetime Limited Warranty on Patented DrySense™ Sensor Technology

In addition to Sierra’s standard one (1) year manufacturing warranty on all instruments produced, Sierra also offers a lifetime warranty on all DrySense™ sensors standard with Sierra models 640i, 780i, 640S, 780S, and 670S instruments sold after January 1, 2010.  This warranty does not extend to the Model 620S, the BoilerTrak™, the HT (High Temperature) 640S/780S sensor or the 780S UHP (Ultra High Purity) sensors. To assure warranty service, customers must register their products online on Sierra’s website. Online registration of all of your Sierra products is required for our warranty process. Register now.

Download Sierra Products Warranty Statement

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2 Year Warranty Coverage for Flow Switches

Sierra offers a two (2) year warranty coverage for our entire line of InnovaSwitch™ Flow Level Switches beginning July 1, 2010.

Technical Support

Chat with us or call (502) 266-6640.

Technical Details

  • Accuracy of +/- 1.5% of full scale
  • Direct monitoring of mass flow rate
  • Flow ranges from 0-10 sccm to 0-50 slpm
  • Large tiltable LCD readout
  • Use with ALL inert gases & mixtures
  • “Primary Standard” calibration for best accuracy & NIST traceability
  • CE approved

Operating Principle

The 820 Series Flow Sensing Principle

The operating principle of Top-Trak transducers is based on heat transfer and the first law of thermodynamics. During operation process gas enters the instrument’s flow body and divides into two flow paths, one through the sensor tube, the other through the laminar flow element bypass. The laminar flow bypass generates a pressure drop, P1–P2, forcing a small fraction of the total flow to pass through the sensor tube (m1).

Two resistance temperature detector (RTD) coils around the sensor tube direct a constant amount of heat (H) into the gas stream. In actual operation, the gas mass flow carries heat from the upstream coil to the downstream coil. The resulting temperature difference (?T) is detected by the RTD coils and gives the output signal. Since the molecules of the gas carry away the heat, the output signal is linearly proportional to gas mass flow.