Sierra SteelMass - Model 640S - Insertion Gas Mass Flow Meter
Named North America's #1 selling thermal mass flow meter (2009 Flow Research, Boston MA), Sierra’s SteelMass Model 640S delivers precise measurements for heavy-duty industrial gas mass and air flow meter measurement applications. This insertion thermal mass air/gas flow meter offers precision SCFM (standard cubic feet per minute), SFPM (surface feet per minute) and SMPS (standard meters per second) measurement of gas mass flow rate in industrial environments.
Product Details
The SteelMass 640S provides more accurate monitoring of peak, low flow and total air/gas mass flow rates, 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 (2 m), choose SteelMass® 640S.
The 640S is GHG certified and ideal for:
- Air volume flow metering
- Compressed air flow
- Aeration basin air flow
- Combustion air flow
- Natural gas fuel flow
- Custody transfer
- Stack gas emissions flow monitoring
Operating Principle: Thermal dispersion technology provides direct mass flow measurement featuring: no pressure or temperature compensation needed; no moving parts; low pressure drop; and high turndown. Watch the video to learn about Thermal Principle of Operation.
Features
- Insertion, totalizing air/gas mass flow meter
- Eliminate drift with patented DrySense sensor
- Increase flexibility with low pressure drop, high turndown
- Validate in the field for easy in-situ calibration
- Backed by lifetime sensor warranty
Product Benefits
- Features our patented zero drift DrySense™ velocity sensor: Watch video...
- Lifetime warranty on sensor
- Sierra's state-of-the-art ISO 9000 closed loop calibration facility matches each application for best accuracy
- Greenhouse Gas (GHG) certified to meet EPA (40 CFR Part 98)
- Optimized (CH4) as well as N20, SF6, HFCs, PFCs and CO2, per the EPA mandate
- Popular choice for landfill gas (LFG) measurement at low pressure (20 - 40 mBarg) and about 40-60°C (100°F) variable flows require a large turndown
- Custom options available:
- Wide range of process connections
- Low and high pressure hot tap
- High temperature option 750°F (400°C)
- Self-cleaning purge for dirty flow environments
- Axial probe design for dirty flow environments
- Longer probe lengths
- Multipoint flow averaging arrays for very large ducts
- Flow-range adjustment and validation and diagnostics
- Dual-range capability
- Field validation/configuration to assure operating performance: Watch video...
- Field rangeability
- Flow totalizer and alarms
- Large LCD display and pushbutton interface, remote enclosure mounting available
- Small-diameter, 3/4 in. (19.1 mm) sensor probe
- Range of process connections (including hot tap)
- Pipe/duct sizes up to 72 inches (2M)
- An inline flow conditioned version is also available - Model 780S
- Very low pressure drop
- No moving parts
- Free computer interface software: Download now...
- Digital communications: Foundation Fieldbus, HART, Modbus RTU, Profibus DP
Specifications
- Accuracy: +/- 1% of reading plus +/- 0.5% of full scale
- Repeatability of +/- 0.2% of full scale
- Flow range to 20,000 sfpm (100 smps)
- Turndown: 100:1
- Measure all inert gases and all non-condensing clean gases
- Flammable gases: methane, propane, hydrogen, digester gas, natural gas
- Corrosive gases compatible with 316L stainless-steel
- 100:1 turndown
- Gas temperature -40°F (-40°C) to 350°F (200°C)
- Ambient temperature -40° F to 120° F (-40° C to 50° C)
- Response time is one second to achieve 63% of final value
- Power supply 18 to 30 VDC (regulated), 625 mA maximum; 100 to 240 VAC, 50/60 Hz, 15 watts maximum
- 316 stainless steel construction
- Output signals: RS-232, 0 to 5 VDC, 0 to 10 VDC, 4 to 20 mA
- User definable pulse output for totalized flow
- Digital communications: Foundation Fieldbus, HART, Modbus RTU, and Profibus DP
- Hazardous-Area Location Enclosure (IP66) and NEMA 4X (IP65)
- Approvals:
- FM (USA) Class I, Div I, Groups B, C,
- CSA and CRN (Canada)
- ATEX
- CE
- PED (EU)
- Chinese Pattern Approval (China)
- GOST R (Russian Federation)
Unique Product Features
- Direct mass flow monitoring eliminates need for separate temperature and pressure inputs
- Accuracy +/- 1% of reading plus 0.5% of full scale
- Patented Dry-Sense™ technology eliminates sensor drift
- State-of-the-art calibration facility insures a highly accurate calibration that matches the application
- Field validation of meter electronics and sensor resistance verifies flow meter performance
- One-second response to changes in flow rate
- FM, CSA, PED, ATEX and GOST R/RTN certified for hazardous areas
- CE approved
- High temperature option to 750°F (400°C) available
- Multipoint options available
- Integrated self-cleaning purge option available for dirty flows
- Low and high pressure hot taps available
- Optional HART, Modbus and Profibus DP available, Foundation Fieldbus (pending)
Self-Cleaning Purge Option
- Maximum process pressure 100 Psi
- Maximum process temperature 500 F.
- Max pressure purge air: 150 Psi
- Process connection Purge air 1/4” NPTF
- Wetted Process Parts: all 316SS
- The purge gas must be clean and dry. Do not use a liquid to clean the sensor inline
- The purge system is only available with E4 and E2 housings
- The purge system is NOT available with FM, ATEX or CSA approval or the high temperature option
Warning: During the purge cycle there will be a high flow over the sensor. This will drive the output of the flow meter to the maximum flow (Output will be 20-26 mA (l
Operation: This is not a continous flow of air, but a blast purge option. The purge nozzle creates a jet stream wich blows deposits from the sensors. The frequency and intensity of the purge is determined by the end user. It can be done with a suitable manual, pneumatic or electric valve (Solenoid). It is also possible to control the purge system automatically (f.i. timer, PLC or HMI).
Note: There is a check valve built Inside the flow meter to prevent the return flow of process gasses into the purge system. Replacement of this valve can only take place in the factory.
Performance Specifications
- Accuracy of Point Velocity : +/- 1% of reading + 0.5% of full scale
- Repeatability : +/- 0.2% of full scale
- Temperature Coefficient
- +/- 0.02% of reading per °F within +/- 50° F of customer specified conditions
- +/- 0.03% of reading per °F within +/- 50° F to 100° F of customer specified conditions
- +/- 0.04% of reading per °C within +/- 25° C of customer specified conditions
- +/- 0.06% of reading per °C within +/- 25° C to 50° C of customer specified conditions
- Pressure Coefficient : .02% per psi for air, consult factory for other gases
- Response Time : One second to 63% of final velocity value
Operating Specifications
Gases
Most gases compatible with 316 L stainless steel
Hastalloy available
Gas Pressure (2 limitations)
Mechanical design pressure:
Compression fittings: 500 psig (34 barg)
1-inch 150 lb flange (-40° to 250° F): 185 psig (12.8 barg)
Low Pressure Hot Tap: 150 psig (10 barg)
High Pressure Hot Tap: 1000 psig (70 barg)
Pressure Drop
Negligible for pipes three inches in diameter or larger
Gas & Ambient Temperature
Gas . . . . . . . . . . . . . . -40° F to 350° F (-40° C to 177° C) Gas dependent.
Ambient . . . . . . . . . . -40° F to 120° F (-40° C to 50° C)
Leak Integrity
5 x 10-9 cc/sec of helium maximum
Power Requirements
18 to 30 VDC (regulated), 625 mA maximum
100 to 240 VAC, 50/60 Hz, 15 watts maximum
High Temperature Option
Up to 750° F (400° C) air only; consult fatory for other gases.
Digital Communications Options
- Foundation Fieldbus (read only; flow and totalized flow)
- Profibus PA (read only; flow and totalized flow)
- MODBUS RTU (read/write most parameters)
- RS-232 (standard; command set available)
Output Signal
- Linear 0–5 VDC or 0-10 VDC, 1000 ohms minimum load resistance or
- Linear 4–20 mA proportional to mass flow rate,
- 700 ohms maximum resistance power supply dependent
- User-selectable: Active non-galvanically separated or Passive galvanically separated (loop power required)
Alarms
- Hard contact user-adjustable high and low
- Dead band adjustable with Smart Interface software
- Relay ratings: Maximum 400 VDC or VAC (peak), 140 mA
Displays
- Alphanumeric 2 x 12 digit backlit LCD
- Adjustable variables via on-board switches (password protected) or with Smart Interface software
- Adjustable variables: Full scale (50 to 100 %)
- Time Response (1 to 7 seconds)
- Correction factor setting (0.5 to 5)
- Zero and span
- High and low alarm settings
Totalizer
- Seven digits (9,999,999) in engineering units
- Resettable by software, on-board switches or external magnet
Software
- Smart Interface Windows-based software
- Minimum 8 MB of RAM, preferred 16 MB of RAM RS-232 communication
- Additional features: Alarm dead band adjustment
- Zero cut-off adjustment
- Linearization adjustment
- Save / Load configurations
- Flow meter validation
Physical Specifications
Wetted Materials
316L stainless steel
Enclosure
Hazardous-Area Location Enclosure (IP66) or NEMA 4X (IP65)
Both are powder-coated cast aluminum
Electrical Connections
Two 3/4 inch NPT: Hazardous-Area Location Enclosure (IP66)
One 1/2 inch NPT: NEMA 4X Enclosure (IP65)
Mounting (optional)
ANSI 1-inch 150 lb flange
3/4-inch tube compression fitting with 1-inch male NPT
Hot tap systems
Certifications
CE (All enclosures)
CSA (Explosion proof for Class I, Division 1, Groups B, C, D)
ATEX ( II 2 GD Ex d IIC T6 ... T2; IP 66 T70 °C ... T280 °C )
FM (Explosion proof for Class I, Division 1, Groups B, C, D; dust-ignition proof for Class II, III, Division 1, Groups E, F, G)
IP65, NEMA 4X T6 -40° C to 70° C ambient
Chinese pattern approval
GOST R/RTN (1ExdIICT6...T2)
Applications
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Flare gas measurement flow meter applications - Air and Climate
Oil wells almost always produce natural gas (“associated gas”) along with the petroleum. In many cases, it is uneconomical to process due to heavy contamination. As a consequence, this gas is combusted, “flared” or simply vented as-is during upset conditions in the process. Newly updated EPA regulations like 40 CFR Part 60 Subpart OOOO (also known as Quad O) as well as the new RSR MACT rule for refineries, requires oil & gas companies to report the flare gas emitted to our atmosphere. ...
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Flow measurement instrumentation for waste water treatment flow solutions - Water and Wastewater - Water Treatment
With its high turndown and direct mass flow, our immersible thermal meters are the instrument of choice for measuring aeration basin air flow and monitoring digester gas. Our multivariable vortex meters are used to measure steam in the cogeneration processes, while our ultrasonic flowmetersare used for influent and effluent measurement.
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Carbon dioxide mass flow meters flow solutions - Air and Climate
Thermal mass flowmeters are ideal for Carbon Dioxide metering and mass flow control. Sierra specializes in accurate mass flow measurement and/or control of CO2 gas. Applications range from general industrial process control across numerous industries to Green House Gas monitoring requirements and general research.
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Nitrogen mass flow meters for solutions - Monitoring and Testing
Sierra specializes in accurate mass flow measurement and/or control of Nitorgen gas. One of the most commonly measured gases, applications are found across numerous industries ranging from general process control to scientific research and development.
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Large pipes & ducts, hot tapping, purging flow solutions - Monitoring and Testing
The accurate measurement of fluid flows in large ducts or pipes offers its own set of challenges. Large ducts and pipes often have swirls or turbulence in them which makes measurement difficult.
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Thermal flowmeter solutions for energy applications - Energy
Sierra thermal flowmeters provide precise flow measurement solutions for a variety of industrial and energy-related applications such as flare gas measurement, cogeneration, biogas measurement, district energy applications, clean coal technology and many more.
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Flow meters for the environmental flow solutions - Environmental
We have developed many flow meters and controllers to measure the emissions from landfills and other green house gas producers, in addition to being a long standing leader in the testing of emissions for large engines. Water treatment is also an important driver for the company as we continue to develop innovative solutions for waste water treatment.
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Facilities management in line air flow meter solutions - Air and Climate
Sierra’s offers a complete line of precision flow solutions for any gas, liquid or steam measurement to improve energy efficiency in all facilities management applications. Our mass vortex meters are used to allocate steam, our in line thermal mass flow meters track and allocate natural gas and compressed air usage, and our clamp-on and insertion ultrasonic meters provide accurate water and water-based fluid measurement.
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Flow meters solutions for petrochemical sector - Chemical & Pharmaceuticals - Petrochemical
Assure accurate and repeatable gas, liquid and steam measurement at your facility. Our volumetric vortex flow meters, multivariable mass vortex flow meters, ultrasonic flow meters and thermal mass flow meters are used for precision measurement of reactants, off-gases, and numerous other fluid flows in the refining industry.
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Oil & gas fluid flow solutions - Oil, Gas & Refineries
Assure accurate and repeatable gas, liquid and steam measurement throughout the oil patch, from monitoring injection at the wellhead and measuring natural gas for heaters and boilers to measuring the various process gases at the refinery or flared in the field. Our volumetric vortex flow meters, multivariable mass vortex flow meters, ultrasonic flow meters and thermal mass flow meters are used for precision measurement in the oil and gas industry.
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Flow measurement instrumentation for gas flow solutions
Sierra offers a complete line of gas mass flow meters and gas flow controllers for most gases, including corrosives and ultra-high purity gases. All of our mass flow meters and flow controllers offer direct mass flow measurement, meaning they do not require pressure or temperature compensation. In addition, Sierra is one of the few companies who can offer solutions for very small flows 94 sccm up to flows in 72-inch pipes.
Downloads related to this product
Videos related to this product
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How Capillary Thermal Mass Flow Controller Technology Works - Video
Learn the principles of capillary thermal mass flow controller technology operation. See how the molecule of gas travels through the pipe and instrument allowing for accurate mass flow control and measurement. Based on heat transfer and the first law of thermodynamics, capillary thermal mass flow controllers enable accurate and repeatable gas mass flow measurement and control.
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In-Situ Thermal Mass Flow Meter Calibration Validation - Video
One of the great benefits of thermal mass flow meter technology is in-situ calibration validation. Learn how the DrySense sensor stability found in Sierra thermal mass flow meters is the only way in-situ calibration validation is actually valid. Sensor drift can create false positives and reduce the reliability of validation. Only with sensor stability that Sierra’s thermal mass flow meters possess can users truly validate a thermal mass flow sens
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Thermal Mass Flow Meters: Sensor Design is Key to Stability, Accuracy, and In-Situ Validation - Video
The type of thermal sensor design used in thermal mass flow meters can have a significant impact on the stability, accuracy and in-situ validation of the application. Watch the video to learn the similarities and differences in so-called “wet” organic sensors and “dry” non-organic sensor design and how innovation has yielded a patented breakthrough all-metal, no-drift thermal sensor design called DrySense. Sierra has backed quali
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