Sierra Boilertrak 620S-BT Insertion Thermal Mass Flow Meter For Boiler & Heater Efficiency (2024)

From Thermal Mass Flow Meters

BoilerTrak is designed to provide an economical, easy-to-install solution for precise natural gas measurement for heaters and boilers to increase efficiency. The instrument is also suited for compliance with new regulations for burning natural gas and propanein commercial boiler applications.

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Product Details:

EPAs GHG & Boiler MACT Certified

TheBoilerTrak thermal mass flow meteris also ideal for compliance for Boiler MACT regulations for inletfuel measurementsforarea source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD). Learn More.

Developed as a fuel measurement solution for customers facing compliance to the California Global Warming Solutions Act of 2006,BoilerTrak™ meets all of the requirements for a stationary combustion fuel meter. This product is optimized for highly accurate and repeatable mass flow metering as mandated by the EPA, including:

  • Methane (CH4)
  • N20
  • SF6
  • HFCs
  • PFCs
  • CO2

Operating Principal:Thermal dispersion technology for direct mass flow measurement featuring: no pressure or temperature compensation needed, no moving parts, low pressure drop, high turndown.

  • 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)
  • Fast delivery—ships next-day from stock

Product Benefits:

  • Since 2006, over 25,000 units installedon methane, propane, natural gas
  • Greenhouse Gas (GHG) certified to meet EPA (40 CFR Part 98)
  • Smart electronics permit field adjustment of critical flow meter settings
  • 200-millisecond response to changes in flow rate
  • Programmable pulse output for remote totalization
  • Minimal flow blockage and low pressure drop
  • Field flow-range adjustment, meter validation and diagnostics
  • Program transmitter via RS-232 using free user software or with three push-buttons on display interface
  • Sierra's state-of-the-art ISO 9000 calibration facility matches each application to ensure best accuracy
  • Flow-range adjustment and validation and diagnostics
  • Field validation/configuration to ensure operating performance
  • Flow totalizer and alarms
  • 2 x 12 backlit LCD display totalizer value
  • Remote enclosure mounting available
  • Very low pressure drop
  • No moving parts
  • Free computer interface software
  • 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)


  • Measure all inert gases and all non-condensing clean gases
  • Accuracy: +/- 1% of full scale
  • Repeatability of +/- 0.2% of full scale
  • Pipe sizes from 3.7' (9.3cm)up to 24' (61cm)
  • Small-diameter, 3/8-inch (9.5mm) sensor probe
  • Flammable gases: methane, propane, hydrogen, digester gas, natural gas
  • 100:1 turndown
  • Temperature:
    • Gas: -40°F to 176°F (-40°C to 80°C)
    • Ambient:-40°F to 120°F (-40°C to 50°C)
  • Response time is 200 milliseconds to achieve 63% of final value
  • Power supply 15 to 18 VDC (regulated), 625 mA draw maximum
  • Output signals: Linear 0–5 VDC and 4-20 mA
  • User definable pulse output for totalized flow
  • Digital communications solutions include:Modbus RTU
  • Enclosure NEMA 4X (IP65); remote electronics mounting available
  • CE approved

Performance Specifications:

  • Accuracy of Point Velocity
    • +/- 1% of full scale (actual gas calibration)
    • +/- 1% of full scale +/- 3% of reading (correlation)
  • 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 7 kpa for natural gas / Methane / Propane
  • Response Time : 200 milliseconds to 63% of final velocity value

Operating Specifications:


Natural gas, Propane, Methane

Gas Pressure

0 psig to 120 psig (0 to 8 barg) Note: actual gas calibration limited to 30 psig (2 barg)

Pressure Drop


Gas & Ambient Temperature

Gas . . . .-40°F to 176°F (-40°C to 80°C)
Note: actual gas calibration limited to 50°F to 100°F (10°C to 38°C)
Ambient . . . -40°F to 120°F (-40°C to 50°C)

Power Requirements

15 to 18 VDC (regulated), 625 mA maximum
Note: no other option available due to safety consideration

Output Signal

Linear 0–5 VDC and 4-20 mA proportional to mass flow rate.


Hard contact user-adjustable high and low
Dead band adjustable with Smart Interface software
Relay ratings . . . . . . . Maximum 42 VAC or 42 VDC, 140 mA


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


Eight digits (9,999,999) in engineering units
Resettable by software or on-board switches


Smart Interface Windows-based software
Minimum 8 MB of RAM, preferred 16 MB of RAM
RS-232 communication
Additional features. . . Alarm dead band adjustment, Low flow cut-off adjustment, Linearization adjustment, Save / Load configurations, Flow meter validation.

Physical Specifications:

  • Wetted Material:
    • Probe : 316SS
    • Sensor : 304SS, glass coating epoxy
  • Enclosure : NEMA 4X (IP65) powder-coated cast aluminum
  • Electrical Connections : One 1/2-inch female NPT
  • Mounting : 3/8-inch tube compression fitting with 1/2-inch male NPT
  • Certifications : CE approved

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Sierra Boilertrak 620S-BT Insertion Thermal Mass Flow Meter For Boiler & Heater Efficiency (2024)
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