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Sierra - Model QuadraTherm 780i -Air/Gas Mass Flow Meter
The QuadraTherm 780i is the most accurate inline thermal mass flow meter for air/gas flow rate measurement on the market today, achieving gas mass flow rate accuracy never before possible, +/- 0.5% of reading above 50% of full scale. The QuadraTherm instruments rivals accuracies of Coriolis technology for measuring mass air flow rate with a breakthrough thermal dispersion technology achieving “percent of reading” accuracy.
- Achieve the highest accuracy +/- 0.5% of reading
- Eliminate drift with DrySense sensor
- Reduce straight-run requirements with built-in flow conditioning
- Needs only 1-diameter up and zero downstream diameters
- Validate in the field for easy in-situ calibration
- 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), Learn more >
- Part of Sierra`s Big-3 iSeries family of flow meter technologies, Learn more >
- Meet EPA rule 40 CFR 63 for flare gas measurement at ultra-low flows down sfps (0.03 smps) with QuadraTherm® qMix RealTime Flare Measurement System (FMS)
Change Gas Mixtures in the Field-No Recalibration Needed
QuadraTherm thermal flow meter equipment comes with on board qMix(tm) gas mixing software that 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 frequently changes. Learn more. Sierra’s new breakthrough QuadraTherm® qMix RealTime Flare Measurement System (FMS) delivers real-time flare gas flow measurement to accurately measure flows down to 0.1 fps, meeting the full range of EPA regulations. Watch video.
Boiler MACT Certified
QuadraTherm air flow measurement devices, such as this thermal mass meter, are 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 More.
QuadraTherm introduces a patented four-sensor thermal mass air flow meter design—three precision platinum temperature sensors and one patented DrySense mass velocity sensor backed by a lifetime warranty. Suitable for compressed air applications, This precision instrument is available in the 640i air/gas flow meter insertion version and this 780i inline version.
Four sensor technology provides the critical inputs for Sierra’s proprietary Raptor OS™ that manages changes in gas and pipe selection, gas temperature, gas pressure and outside temperature for precision air flow velocity measurement.
- Patented DrySense sensor backed by lifetime sensor warranty
- In-Situ calibration for in the field validation
- Built-in flow conditioning to reduce straight run requirements
- qMix gas mixing software to change gases in the field-no recalibration required
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.
- Patented breakthrough QuadraTherm "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 accuracies of 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)
- Ideal for high accuracy applications like custody transfer, wastewater treatment, hazardous areas, facilities management and general process control applications
- Built-in flow conditioning elements drastically reduce upstream straight-run requirements
- 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; Download Flare Gas Mass Measuring Tech Note
- Capability to change pipe size (Dial-A-Pipe®) in the field
- Unique multi-gas flow totalizer and alarms
- Patented breakthrough QuadraTherm "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 accuracies of 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)
- Ideal for high accuracy applications like custody transfer, wastewater treatment, hazardous areas, facilities management and general process control applications
- Built-in flow conditioning elements drastically reduce upstream straight-run requirements
- 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; Download Flare Gas Mass Measuring Tech Note
- Capability to change pipe size (Dial-A-Pipe®) in the field
- Unique multi-gas flow totalizer and alarms
- Accuracy: +/- 0.5% of reading above 50% of full scale*
- Repeatability of +/- 0.15% of full scale
- Pipe sizes from 1.0" to 8.0" (1.3cm to 20.3cm)
- Flow range 0 to 60,000 sfpm (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
- 100:1 turndown
- Gas Temperature -40°F (-40°C) to 392°F (200°C)
- Ambient temperature: -40°F to 140°F (-40°C to 60°C) / ATEX/IECEx Versions -4°F to 140°F (-20°C to 60°C)
- *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, 4-20 mA flow, 4-20 mA temperature, 4-20 mA pressure (optional)
- Alarm output (contact SPST/opto relays)
- User definable pulse output for totalized flow
- Digital communications: HART and Modbus RTU
- Modbus digital communications on both AC and DC powered units
- Hazardous-Area Location Enclosure (IP66)
- Approvals:
- cFMus–Explosion proof for Class I, Div I, Groups B,C,D
- CE–European Conformity
- ATEX/IECEx