Sierra QuadraTherm™ - Model 640i - Air / Gas Thermal Insertion Mass Flow Meters
The QuadraTherm® 640i is the most accurate insertion-probe thermal mass flow meter for air / gas mass flow rate measurement on the market today, achieving gas mass flow rate accuracy never before possible, +/- 0.75% of reading above 50% of full scale. The QuadraTherm 640i air / gas mass flow meter marks an accuracy breakthrough in thermal dispersion technology achieving extreme precision with 'percent of reading' accuracy, which for the first time rivals accuracies of Coriolis technology for measuring mass air flow rate and other gases.
Product Overview:
Each QuadraTherm thermal flow meter comes with on board qMix(tm) gas mixing software which allows you to create custom gas mixtures in the field to compensate for gas compositional changes-no costly recalibration needed. Perfect for managing changes in flare gas composition in the field for upstream oil & gas flare gas measuring applications and other applications in which gas composition fequently changes. Learn more.
Boiler MACT Certified
The QuadraTherm thermal mass flow meter is also ideal for compliance for Boiler MACT regulations for inlet fuel measurements for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD). Learn
The QuadraTherm air mass flow meter features a patented four-sensor design--three precision platinum temperature sensors and one patented DrySense mass velocity sensor. This allows for precision air and gas flow measurement. Available in either an insertion version or inline version, this mass flow meter includes Sierra's proprietary Raptor OS operating system.
QuadraTherm's four-sensor technology provides the critical inputs for Raptor's living, learning algorithm set and gas database that accurately manages changes in gas and pipe selection, gas temperature, gas pressure and outside temperature. Also easily change gas composition in the field while retaining accuracy with qMix software.
Mass Air Flow Meter Operating Principle: Thermal dispersion technology provides direct mass air flow measurement featuring no pressure or temperature compensation needed; no moving parts; low pressure drop; and high turndown.
Features:
- Achieve high accuracy +/- 0.75% of reading
- Eliminate drift with patented DrySense™ sensor
- Validate in the field for easy in-situ calibration
- Use qMix software to easily change gas composition in the field and retain accuracy
- Backed by lifetime sensor warranty
- Boiler MACT certified for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD)
- Part of Sierra's Big-3 iSeries family of flow meter technologies
Product Benefits:
- Patented breakthrough 'quad' 4-sensor thermal sensor technology
- Patented zero drift DrySense™ velocity sensor
- Lifetime warranty on sensor
- 'Percent of reading' accuracy, which for the first time rivals Coriolis technology
- 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
- Ideal for high-accuracy applications like custody transfer, wastewater treatment, hazardous areas, facilities management and general process control applications
- Features our proprietary Raptor OS™ operating system (formerly known as qTherm)
- ValidCal™ Diagnostics: field calibration validation and meter diagnostics to assure operating performance
- Multivariable outputs - gas mass flow rate, temperature and pressure
- Total of four gases onboard; Capability to change gas (Dial-A-Gas®) in the field
- Free qMix™ software to create custom gases or mixtures to compensate for compositional changes; upload mixtures to the unit in the field
- Capability to change pipe size (Dial-A-Pipe) in the field
- Unique multi-gas flow totalizer and alarmsHigh flows up to 60,000 scfm (305 smps)
- Small-diameter, 3/4-inch (19.1 mm) sensor probe
- Pipe/duct sizes up to 72' (2M)
- Low and high pressure hot tap
- An inline flow conditioned version is also available - Model 780i
- Very low pressure drop
- No moving parts
- Free computer interface software
- Connected to the most up-to-date gases in our proprietary Raptor Gas Library, update the instrument via the web
- Large LCD display and pushbutton interface, remote enclosure mounting available
- Multi-language display interface: English, German, Chinese, Spanish, Dutch
- Certified for Boiler MACT measurement meeting EPA regulations for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD)
Specifications:
- Accuracy: +/- 0.75% of reading above 50% of full scale*
- Repeatability: +/- 0.15% of full scale
- Flow range 0 to 60,000 sfpm (0 to 305 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
- Gas/ambient temperature: -40°F to 392°F (-40°C to 200°C)
- 1-inch (25.4 mm) diameter protective sensor shield option for improved sensor protection. Learn more.
*Verified by an independent NIST & NVLAP accredited lab
- Response time is three seconds to achieve 63% (one time constant) of final value
- Power supply: 100 to 240 VAC (0.4 Amps RMS at 230 VAC); 24 VDC +/- 10%, 1 Amp
- 316 stainless steel construction
- Output signals: RS-232, 4 to 20 mA flow, 4 to 20 mA temperature, 4 to 20 mA pressure (optional)
- Alarm output (contact SPST/opto relays)
- User definable pulse output for totalized flow
- Digital communications: Foundation Fieldbus,HART, Modbus RTU, and Profibus DP
- Hazardous-Area Location Enclosure (IP66)
- Approvals:
- cFMus–Explosion proof for Class I, Div I, Groups B,C,D
- ATEX
- IECEx
- GOST R
- Chinese Pattern
- CE–European Conformity
Applications
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Flow Measurement instrumentation for digital flow meter air measurement solutions - Monitoring and Testing
From heavy industrial to research and analytical applications, Sierra has a wide range of digital air flow meters and controllers with digital output protocols for easy network integration. Sierra offers air flow meters and across two core technologies: Immersible Thermal and Capillary Thermal.
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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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Argon mass flow meters flow solutions - Monitoring and Testing
Thermal mass flowmeters and controllers are ideal for Argon application where precision is key. Sierra specializes in accurate mass flow measurement and/or control of Argon gas. Popular applications range from general industrial process control, inerting and steel purification processes to name a few.
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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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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 digital air / gas, steam, water flow meters - Monitoring and Testing
For over 40 years Sierra has advanced our flow technology to offer customers around the globe the most cutting-edge thermal technology on the market. From heavy industrial to research and analytical applications, Sierra has a wide range of digital air flow meters and controllers with digital output protocols for easy network integration. Sierra offers digital gas flow meters and mass flow meters across two core technologies: Capillary Thermal, and Immersible Thermal. Buy a large ...
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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.
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Volumetric flow meters for water treatment facility support - Monitoring and Testing - Waste Monitoring and Testing
Maintaining the health of your water treatment facility requires instrumentation you can rely on. Sierra offers turnkey solutions for a variety of gas, liquid, and steam applications. From tracking and allocating natural gas, to measuring compressed air, to aeration basins and digester gas measurements, our thermal mass flow meters are ideal: high turndown, direct mass flow and the highest accuracy in the market—+/- 0.75% of reading.
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Plant services flow solutions - Monitoring and Testing
Mulitvariable Mass Vortex, Transit-Time Ultrasonic and Thermal Mass flow meters are used extensively to allocate steam, measure liquids and track natural gas and compressed air usage.
Videos related to this product
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Inventing the Perfect Sensor for Thermal Mass Flow Meters - Video
Since founding Sierra Instruments over 40 years ago, Dr. John G. Olin has been driven by the vision of supplying industrial customers with the world`s most accurate thermal mass flow meter. QuadraTherm thermal technology fulfills that vision with its four-sensor thermal mass flow meter design.
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Inventing the Perfect Sensor for Thermal Mass Flow Meters - Video
Since founding Sierra Instruments over 40 years ago, Dr. John G. Olin has been driven by the vision of supplying industrial customers with the world`s most accurate thermal mass flow meter. QuadraTherm thermal technology fulfills that vision with its four-sensor thermal mass flow meter design.
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QuadraTherm Mass Flow Meter Sensor & iTherm Math - Video
Traditional thermal mass flowmeter sensors have two sensors—one temperature sensor and one velocity sensor, each in a separate probe. Sierra Instruments Founder Dr. John G. Olin discusses how the QuadraTherm mass flow meter introduces four sensors—three precision platinum temperature sensors and one patented DrySense mass velocity sensor. The use of these four sensors provides unparalleled accuracy accommodating any gas or gas mixture and co
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Relationship Between QuadraTherm Flow Meters & Outside Temperature - Video
Interview with inventor, Dr. John G. Olin PhD, a pioneer of thermal mass flow meter instrumentation and founder of Sierra Instruments, on the relationship between Sierra`s Quadratherm Thermal Mass Flow Technology and outside temperature. The QuadraTherm sensor of this flowmeter works together to manage for changes in T, P, gas and outside temperature effects. Dr. Olin explains how Quadratherm flow meter technology pays off and how the temperature sensor
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Thermal Mass Flow Meter Field Flexibility Dependent on iTherm Living Math - Video
QuadraTherm thermal mass flow meter four-sensor technology provides the critical inputs for qTherm`s (formerly iTherm) living, learning algorithm set. qTherm technology allows for extreme field flexibility and supports our gas database to accurately manage changes in gas and pipe selection, gas temperature, gas pressure and outside temperature. Sierra Instruments Founder, Dr. John G. Olin, discusses how with iTherm, it learns.
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Multi-Gas Flow Totalizer for Sierra QuadraTherm 640i/780i Mass Flow Meter - Video
Sierra Instruments` Smart Interface Program (SIP) for QuadraTherm 640i/780i mass flow meters provides end-users with a powerful feature to totalize four unique gases independently. Learn how to set up and use this flow totalizer feature. Get the most out of your Sierra industrial mass flow meter with the SIP features.
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Create Custom Gas Mixtures Using qMix for QuadraTherm 640i/780i - Video
Create custom gases and gas mixtures on the fly with Sierra Instruments` powerful qMix app. This app is part of a suite of apps for the Smart Interface Program (SIP) for QuadraTherm 640i/780i thermal mass flow meters.
