Mass Flow Meter / Controller - SideTrak® 830/840

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Premium Analog Mass Flow Meter

For precise mass flow measurement of any clean dry gas including mixtures, toxics, corrosives, and combustible gases, consider our Model 830 MFM. The Model 830 is ideal for process monitoring, gas blending and flow calibration applications among many others.

Sierra’s Model 830 uses Sierra’s patented sensor design with access ports to facilitate easy sensor cleaning. In addition, Sierra’s Platinum Sensor Technology eliminates zero-drift and creates excellent long-term reliability.

  • Accuracy of +/- 1% of full scale
  • 316 stainless steel construction
  • Flow ranges from 0-10 sccm to 0-500 slpm
  • Direct monitoring of mass flow rate
  • “Primary Standard” calibration for best accuracy & NIST traceability
  • CE approved
SideTrak® 830/840 Mass Flow Meter / Controller

SideTrak® 830/840 Mass Flow Meter / Controller

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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.

Operating Principle

The Series 800 Flow Sensing Principle
The operating principle of Sierra’s Side-Trak and Auto-Trak flow meters and controllers 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 element bypass generates a pressure drop, P1–P2, forcing a small fraction of the total flow to pass through the sensor tube (m1) which is then monitored.

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.

Figures 1-2 and 1-3 show the mass flow through the sensor tube as inversely proportional to the temperature difference of the coils. The coils are legs of a bridge circuit with an output voltage in direct proportion to the difference in the coils’ resistance; the result is the temperature difference (∆T). Two other parameters, heat input (H) and coefficient of specific heat (Cp) are both constant. The resulting output is nearly linear over the transducer’s normal operating range.

For mass flow controllers, once the gas flows through the monitoring section, it is then controlled by the built-in servo-control valve. For flows up to 500 slpm, Sierra’s proprietary high-efficiency FastTrak Electromagnetic Valve is used. The normally closed FastTrak valve is similar to an on/off solenoid valve, except that the current to the valve coil, and hence the magnetic field, is modulated so that the ferromagnetic valve armature, or valve plug, assumes the exact height above the valve’s orifice required to maintain the valve’s command flow. The result is nearly infinite resolution. All controllers with the Fast-Trak valves are available with a “Soft-Start” option for those processes that require it.

For higher flows of 50 to 200 scfm, controllers are equipped with Sierra’s microprocessor-controlled, motor-operated rotary valve. While the rotary valve does not provide a completely positive shut-off, it does offer accurate control for higher flow installations.