Steel Mass Industrial Insertion Mass Flow Meter - SteelMass 640S

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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

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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

  • 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.