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The Sierra Steel-Trak Model 640S immersible thermal mass flowmeter is now available in a high-temperature option capable of trouble-free operation in process temperatures of up to 400C.

Used in heavy industry, the Steel-Trak Model 640S is designed for the most demanding industrial flow measurement applications.

Constructed of heavy-duty 316 stainless steel wetted materials, the high-temperature version of the Model 640S includes remote-mounted electronics and mineral-insulated cabling resistant to very high temperatures.

The meter is already in use in such critical applications as electrical power generation, stack gas measurement, petrochemical refining and steel making.

One such application is in coal-fired power plants, where combustion air is preheated to temperatures approaching 260C before being mixed with the pulverised coal and burned in the boiler to produce steam for electricity.

It is critical that the preheated air mass flow rate is measured accurately in order to obtain efficient combustion.

The Model 640S now meets this challenge with high accuracy, easy installation and low maintenance in a rugged, explosion-proof package.

Featuring direct gas mass flow measurement, each Model 640S uses Sierra Dry-Sense technology for drift-free performance.

The meter also features the Sierra smart interface package for field programming and meter validation and diagnostics.

All of the Sierra flowmeters are calibrated to exacting customer specifications at the Sierra calibration laboratories, directly traceable to NIST, compliant to ANSI/NCSL Z540 and MIL-STD-45662A, and certified to ISO 9001 standards.

The Steel-Trak Model 640S is hazardous area-approved by CSA and CRN (Canada), FM (US), ATEX, CE and PED (EU), IEC Ex (Australia) and Chinese Pattern Approval (China).

Meter accuracy is +/-1 per cent of reading and +/-0.5 per cent of full scale with repeatability of +/-0.2 per cent of full scale.

The 0.75in diameter sensor probe inserts easily into ducts and pipes up to 72in in size, and is offered with a wide range of process connections (including hot tap).

For very large ducts, multipoint flow averaging arrays are available, complete with a self-contained human-machine interface (HMI) panel that allows for touchscreen field programming and operation of the entire system.

Probes may easily be removed for cleaning, or the optional built-in purge cleaning system (using external high-pressure air) may be used.

Sierra Instruments

With in excess of 150 locations in more than 50 countries, our Flow Measurement and Control Division is known for the design and manufacture of innovative high-performance fluid flow measurement and control instrumentation for nearly any gas, liquid and steam application spanning across global industries as diverse as scientific research, semiconductor, wastewater treatment, iron and steel, clean energy, aerospace and biotech, to name a few.

Experience our passion for flow

Our Flow Measurement and Control Division designs and manufactures high-precision capillary-sensor-based mass flowmeters and controllers for gas flow in applications. We also design and manufacture immersible thermal mass, transit-time ultrasonic, vortex shedding and multivariable flow instruments in both standard and customised versions for applications in industrial and hazardous environments.

Our technologies precisely measure and/or control very low flows of gas down to less than 1sccm full scale, as well as extremely high flows of gas, liquid and steam. With rugged product design, cutting-edge innovation and a worldwide team of flow experts, we know you will 'experience our passion for flow'.

Our flowmeters and controllers provide a high return on investment.

  • Direct mass flowmeters provide improved accuracy and cost efficiencies
  • Direct mass flowmeters do not need pressure or temperature compensation equipment or flow computers
  • Flowmeters provide immunity to process changes in P&T, leading to very repeatable measurements
  • In gases, density is highly variable. Unlike mass flowmeters, volumetric gas flowmeters are very sensitive to changes in pressure and temperature
  • Mass flowmeters are a necessity in more than 80 per cent of all industrial processes such as those involving chemical reactions, combustion, respiration and HVAC, which are based on mass flow, not volumetric flow

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