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600 & 700 Series

Thermal Mass Flow Meters

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QuadraTherm 640i
QuadraTherm® 640i

Industry's Most Accurate Air / Gas Thermal Insertion Mass Flow Meters

  • 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 Download Flare Gas Mass Measuring Tech Note
  • 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)
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QuadraTherm<sup>®</sup> 780i Inline Mass Flow Meter.
QuadraTherm® 780i

Highest Air/Gas Mass Flow Measurement Accuracy in Industry

  • 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)
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TM500
TM500™

High Performance Industrial Thermal Mass Flow Meter

  • Accuracy 
    • +/- 1.0% of reading plus +/- 0.2% of full-scale – Air, Nitrogen 
    • +/- 1.5% of reading plus +/- 0.5% of full-scale – All other gases
  • Repeatability +/- 0.2% of full scale
  • Direct measurement of gas mass flow / No volume to mass calculations
  • DigiSense™ robust sensor design
  • AC or DC power 
  • Use optional Gas-Mix™ feature to easily change gas selection or create gas mixes in the field - no recal required 
  • 2-3 week delivery lead times / 1 week delivery possible
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TM100
TM100™

Economical Industrial Thermal Mass Flow Meters

  • Accuracy 
    • +/- 1.0% of reading plus +/- 0.2% of full-scale – Air, Nitrogen 
    • +/- 1.5% of reading plus +/- 0.5% of full-scale – All other gases
  • Repeatability +/- 0.2% of full scale
  • Direct measurement of gas mass flow / No volume to mass calculations
  • DigiSense™ robust sensor design
  • 12 to 24 volt DC power 
  • Use optional Gas-Mix™ feature to easily change gas selection or create gas mixes in the field - no recal required  
  • 2–3-week delivery lead times / 1-week delivery possible
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BoilerTrak 620S BT Mass Flow Meter
BoilerTrak™ 620S-BT

Insertion Thermal Mass Flow Meter for Boiler & Heater Efficiency

  • Optimized natural and propane measurement for 1, 2, 3, 4 inch sch. 40 pipe sizes
  • Wide flow ranges from 0 to 42,000 scfh
  • Easily install in the field or retrofit
  • Certified for GHG measurement meeting EPA (40 CFR Part 98)
  • Boiler MACT certified for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD) Learn More. 
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BioTrak 645i/745i Wastewater Thermal Mass Flow Meter
BioTrak™ 645i/745i 

Wastewater Dedicated Thermal Mass Flow Meter

  • Field-Selectable Gases-air, methane, digester gas 
  • Direct mass flow measurement maintains precise control of aeration, digestion, and cogeneration 
  • Accuracy: Air: +/-1% of reading +/-0.2% of full scale  - Other gases: +/-1.5% of reading +/-0.5% full scale 
  • Insertion and inline versions
  • AC or DC power input available 
  • Optional hot top packing gland and retractor 
  • Integral and remote electronic configurations available 
  • Wide measurement range up to 1000:1 turndown; 100:1 typical 
  • BioCal Calibration Validation within five minutes  
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FastFlo 620S Mass Flow Meter
FastFlo™ 620S

Fast-Response Insertion Thermal Mass Air Flow Sensor

  • Increase efficiency with fast response time within 200 milliseconds
  • Optimized air, nitrogen, and inert gas measurement for 1, 2, 3, 4 inch sch. 40 pipe sizes
  • Wide flow ranges from 0 to 42,000 scfh
  • Easily install in the field or retrofit
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SteelMass 640S
SteelMassTM 640S

Insertion Gas Mass Flow Meter

  • 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
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qMix Gas Mixing Feature
qMix Gas Mixing Feature

Field-Update For Gas Composition Changes

  • Powerful, gas mixing software to create custom gas mixtures in the field
  • Per meter license gives unlimited custom gas mixtures and uploads per meter serial number
  • Maintain flow meter accuracy if gas composition changes
  • No need to send unit back to the factory if gas composition changes
  • Avoid costly recalibration
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FlatTrak 780S
FlatTrak™ 780S

Inline Thermal Mass Flow Meters with Flow Conditioning

  • Reduce straight-run requirements with built-in flow conditioning
  • Eliminate drift with DrySense sensor
  • Needs only 3-diameters up, zero downstream
  • Validate in the field for easy in-situ calibration
  • Backed by lifetime sensor warranty
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FlatTrak 780S-UHP
FlatTrak™ 780S-UHP

Industry-Choice For Bulk High Purity Gas Custody Transfer To Semicon Fabs

  • Optimized for bulk ultra high purity (UHP) gas custody transfer
  • Direct mass flow measurement
  • No moving parts, 100:1 turndown, low pressure drop
  • Reduce straight-run requirements with built-in flow conditioning
  • Validate in the field for easy in-situ calibration
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Flow Totalizer
Flow Totalizer

Four Multi-Gas Flow Totalizers for the QuadraTherm Thermal Mass Flow Meter

  • View and totalize four gases with one instrument
  • Totalize multiple gases independent of each other
  • Accurately monetize and allocate gas usage
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QuadraTherm<sup>®</sup> qMix RealTime Flare Measurement System
Measure Flare Gas in Real Time

QuadraTherm® qMix RealTime
Flare Measurement System

  • Meet EPA rule 40 CFR 63-measure flare gas down to 0.1 sfps (0.03 smps) where ultrasonic flow meters can't operate
  • Handles upset conditions at ultra-high flows with wide 1000:1 turndown
  • Easy to install with current ultrasonic flow meters-no process shutdown
  • Use qMix RealTime App to connect, read, and update new flare gas composition from a GC-real time, no recalibration needed
  • Set update frequency by time or by percentage change in the gas composition
  • Get flow and composition trend analysis, flow alarming and triggers
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BioTrak™ 645S/745S Thermal Mass Flow Meter
BioTrakTM 645S/745S

Wastewater Thermal Mass Flow Meter

  • Direct mass flow measurement maintains precise control of aeration, digestion, and cogeneration
  • Microprocessor based, field-programmable electronics
  • Wide measurement range up to 1000:1 turndown; 100:1 typical
  • DigiSense sensor design / Swivel probe ±180° into four positions
  • BioSelect™ menu provides field selectable air, methane, and digester gas
  • BioView™ software provides access to meter data / Configure meter settings in field
  • BioCal™ verifies calibration within five minutes
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