Steel Mass Industrial Insertion Mass Flow Meter - SteelMass 640S

Insertion, Totalizing Meter Application

Accurate monitoring of peak, low flow and total gas mass flow rates is a critical part of many industrial process control systems. If you need a portable analog or digital air flow meter that easily inserts into industrial ducts and pipes (up to 72 inches), choose Sierra Instruments SteelMass® 640S.

  • 316SS construction
  • Range of process connections (including hot tap)
  • Field Validation/Configuration
  • +/- 1% of reading plus +/-0.5% of full scale
  • Very large installed base
 SteelMass 640S Industrial Insertion Mass Flow Meter

SteelMass 640S Industrial Insertion Mass Flow Meter




Technical Details

  • 316SS construction
  • Range of process connections (including hot tap)
  • Field Validation/Configuration
  • +/- 1% of reading plus +/-0.5% of full scale
  • Very large installed base
  • Removable probe for recalibration and service
  • Meters all process gases
  • 3/4” diameter insertion probe
  • Digital communications solutions include: Foundation Fieldbus, HART, Modbus RTU, and Profibus DP.

Product Information

Accurate monitoring of peak, low flow and total gas mass flow rates is a critical part of many industrial process control systems. If you need a portable analog or digital air flow meter that easily inserts into industrial ducts and pipes (up to 72 inches), choose Sierra Instruments SteelMass® 640S.

Sierra, a leader among global flow measurement and control equipment manufacturers and suppliers, recommends its SteelMass air volume flow meter for compressed air flow, aeration basin air flow, combustion air flow, natural gas fuel flow, custody transfer and stack gas emissions flow monitoring. All of Sierra's thermal instruments feature Sierra's proprietary DrySense™ Sensor Technology backed by a Lifetime Limited Warranty.

Customize Your SteelMass 640S

SteelMass 640S can be customized for your air velocity and intake applications with:
Larger probe lengths.
High temperature option (750 degrees F).
Self-cleaning purge option for dirty flow environments.
Wide range of process connections (including hot tap).
Multipoint flow averaging arrays for very large ducts, complete with a self-contained human-machine interface (HMI) panel for touch-screen field programming and system operation.

SteelMass inline air flow meters also feature Sierra's unique Smart Electronics Package for field rangeability, flow-range adjustment and validation and diagnostics. With very low pressure drops and wide turndowns, these products are hazardous-area approved by CSA and CRN (Canada); FM (USA); ATEX, CE and PED (EU); GOST R (Russian Federation); and Chinese Pattern Approval (China). Meter accuracy is +/- 1% of reading, plus +/-0.5% of full scale with repeatability of +/- 0.2% of full scale.

Sierra’s digital communications solutions offer engineers and systems integrators, full industrial system integration and networking capability with Sierra's thermal mass flow meters. Digital communications solutions include: Foundation Fieldbus, HART, Modbus RTU, and Profibus DP. This flexibility of communication features offers turnkey solutions for integration of Sierra's thermal mass flow meters into any industrial automation system or application.

SteelMass 640S are GHG Certified

As a certified greenhouse gas (GHG) air flow meter, the SteelMass:
Meets all requirements defined by the EPA (40 CFR Part 98).
Is optimized for highly accurate and repeatable mass flow meters for methane (CH4) as well as N20, SF6, HFCs, PFCs and CO2, per the EPA mandate.

SteelMass is also a popular choice for landfill gas (LFG) measurement applications. LFG – a very humid, dirty gas that leaves the landfill at low pressure (20 - 40 mBarg) and about 40-60°C (100°F) – makes differential pressure (dP) devices like orifice plates unsuitable, while variable flows require a large turndown. Sierra’s 640S Insertion Mass is ideal for LFG, as it offers 100:1 turndown, has no moving parts and generates nominal pressure drop across the immersible sensor probe.


Operating Principle

Sierra’s unique Steel-TrakTM sensor probe is responsible for the unsurpassed accuracy, ruggedness and reliability of Sierra industrial flow meters. The immersible Steel-Trak sensor consists of two sensing elements–a velocity sensor and a temperature sensor that automatically corrects for changes in gas temperature.

When power is applied to the flow meter, the transducer electronicsheats the velocity sensor to a constant temperature differential abovethe gas temperature and measures the cooling effect of the gas flow.The electrical power required to maintain a constant temperature differential is directly proportional to the gas mass flow rate.

Both sensors are reference-grade platinum resistance temperature detectors (RTDs). The platinum RTD wire is wound on a rugged ceramic mandrel for strength and stability. Steel-Trak sensors are clad in a rugged, sealed 316 stainless steel encasement.