Biogas Flow Meters for Monitoring Biogas from Digesters

Fox Thermal Biogas Applications

Thermal mass flow meters are widely used to monitor gases from anaerobic digesters, landfill and agricultural/livestock digesters.

The instrument’s wide turndown provides an accurate measurement of the fuel gas produced, and a built-in totalizing function facilitates environmental auditing procedures of greenhouse gas emissions for Title 40 CFR Part 98 Subpart JJ.

Biogas is produced when organic matter, such as sewage, manure or vegetable matter, decomposes in the absence of oxygen. This may take place in a landfill site or in an anaerobic digester to produce biogas. The biogas mixture is typically 70% methane and 30% carbon dioxide.

Methane is a powerful greenhouse gas that remains in the atmosphere for approximately 9-15 years, is more than 20 times more effective at trapping heat in the atmosphere than carbon dioxide, and is of growing environmental concern. Methane is also a primary constituent of natural gas and an important energy source. As a result, efforts to utilize methane emissions can provide significant energy, economic and environmental benefits.

Landfills are the largest human-related source of methane in the U.S., accounting for 34% of all methane emissions. Thermal mass flow meters are widely used in many landfill, wastewater and sewage treatment applications, including:

  • Digester gas flow monitoring
  • Oxygen/oxone flow monitoring
  • Chlorine gas flow monitoring
  • Sample flow for gas chromatography

Methane is also produced during the anaerobic decomposition of organic material in livestock manure management systems. Liquid manure management systems, such as lagoons and holding tanks, can produce significant amounts of methane. Many large swine and dairy operations are turning manure into a valuable resource by substituting biogas for natural gas or propane as fuel for boilers and electrical generators.

Farmers are also capturing methane from anaerobic digesters and monetizing the resulting carbon credits through greenhouse gas emissions allowance trading systems. Biogas flow meters help these farmers measure the methane for reporting purposes.

Using the Gas-SelectX® gas selection menu to choose a 3-Gas Mix, the Model FT1 can measure biogas easily and accurately, even with a fluctuating gas composition.

Read more about biogas applications.

Fox Thermal strives to design and manufacture the most innovative and reliable thermal mass flow meter products to our customers. All Fox Thermal meters measure mass flow rate and are available in insertion and inline models. Fox Thermal models FT1, FT2A and FT3 are mass flow meters and temperature transmitters providing isolated 4-20mA and pulse output for flow rate, and a 4-20mA pulse output for process gas temperature or a second flow rate output.

Fox Thermal flow meters are often calibrated to measure air flow. Please review the product features for Models FT1, FT2A and FT3 for further information about our thermal mass flow meter products. If you’re not sure which meter is right for your biogas application, use our Help Me Choose app to find the ideal meter or Contact Us today!

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