Wastewater Flow Meter Applications

Maintain Process Accuracy & Efficiency With Wastewater Flow Meters

Fox Thermal mass flow meters provide accurate, reliable gas flow rate monitoring for wastewater treatment plants:

  • Airflow to wastewater treatment pools (aerobic)
  • Biogas flow from wastewater digesters for cogeneration (anaerobic)
Help Me Choose A Flow Meter
Digesters and clarifying tank at a wastewater treatment facility

Fox Thermal Wastewater Gas Flow Meters Provide

Temperature Monitoring and Control

Anaerobic bacteria used to break down solid material in a sludge digester tank must be maintained at the right temperature to optimize the process.

More Efficient Water Treatment Systems

The flow of oxygen fed into aeration tanks must be monitored and then compared to water sample data to find oxygen transfer inefficiencies.

Accurate Digester Biogas Monitoring

Despite a wide range of flow rates, thermal mass flow meters maintain accurate measurement of digester biogas for capture, storage, and use in heat exchangers or boilers.

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Top Flow Meters for Wastewater Air and Biogas Applications

fox thermal product ft1 meter

Model FT1

The FT1 is a cost-effective digester gas flow meter model that comes with both the Gas-SelectX® and CAL-V™ calibration validation features. These allow the gas composition settings to be changed and also verified in the field. When DC power is required, the FT1 is the right flow meter to order.

View Model FT4X
fox thermal product ft2A meter

Model FT2A

The Fox Thermal Model FT2A gas flow meter has a large selection of communication protocol options available, including BACnet MS/TP, RS485 Modbus RTU, Profibus-DP, DeviceNet, or Ethernet Modbus TCP. It is NEMA 4X approved for hazardous locations.

View Model FT2A
fox thermal product ft4X meter

Model FT4X

The FT4X flow meter measures digester gas flow rate/total and temperature. It comes with a BLM accuracy-compliant data logger which maintains a 7-year history. Includes Gas-SelectX® & CAL-V™ features. Choose the FT4X when AC power or a remote configuration is required.

View Model FT4X

More About Wastewater Flow Meter Applications

Wastewater Treatment Plants (WWTPs) use large heated digester tanks to remove and dispose of solid waste material. Biogas is produced when solid waste's organic matter decomposes without oxygen (anaerobic).

Biogas generally consists of about 70% methane and 30% carbon dioxide (CO2). Methane is a powerful greenhouse gas that remains in the atmosphere for approximately 9 to 15 years. As a primary constituent of natural gas, methane is a valuable energy source that can be used to power heat exchangers or boilers. Any unused gas may be flared following EPA or other greenhouse gas regulations.

Because of their wide turndown and no-moving parts design, thermal mass flow meters are commonly used to monitor biogas. Fox Thermal mass flow meters can accurately measure biogas flow rates in wastewater treatment facilities to optimize digester processes, comply with environmental regulations (40 CFR Part 98 Subpart II), and control fuel and airflow ratios in biogas combustion processes.

Help Me Choose A Flow Meter
Digesters at a wastewater treatment plant

Monitoring Aeration Systems in Wastewater Treatment Facilities

In wastewater aeration pools, one of the most important factors for proper treatment is determining how much air volume in standard cubic feet per minute (SCFM) will be needed to deliver the mass of air required for optimal bacterial biodegradation of organic matter.

WWTPs use mass flow meters to locate and eliminate failures or inefficiencies in blowers or air compressors. They also can be used for detecting clogged diffusers and aspirated mixers.

Wastewater treatment tank with aeration process

Gas-SelectX® for Superior Wastewater Gas Flow Meter Applications

As wastewater digester gas flow compositions change over time, flow meters must be sent back to the factory to be recalibrated. But not with the Gas-SelectX® feature, available on Fox Thermal mass flow meter models FT1, FT4A, and FT4X.

With the Gas-SelectX® feature, users can change the settings to match the new gas composition in the field without removing the flow meter from the process. Once the setting is changed, the flow meter’s NIST-standard calibration can be verified in situ using the CAL-V™calibration validation feature.

For wastewater digester gas flow meters, the FT1 and the FT4X are the most commonly used. When DC power is required, the FT1 is the best choice, and when AC power or a remote configuration is required, the FT4X is the right model

Fox Thermal's FT4X for wastewater digester gas flow meter applications.

How to Get Flow Meters for Your Waste Water Treatment Application

Our app can help you choose the right wastewater flow meter model fast

If you’re not sure which flow meter is right for your needs, our Help Me Choose app walks you through a short series of questions to help you choose the ideal meter.

Enter basic details in the configurator form

Simply enter your digester process data and measurement requirements into our automated thermal mass flow meter configurator. Drop-down menus and Help icons will guide you to answer each question.

Save and submit your application data for a quote — it’s that easy!

Save the data you entered into the configurator to create a PDF with a model code and application ID. When you're ready, submit your application to the team at Fox Thermal for a quote.

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News & Innovation

Gas-SelectX® Datasheet

The GasSelectX feature makes the FT1, FT4A, and FT4X the only thermal mass flow meters that can be reconfigured in the field and still maintain their factory-specified accuracy.

Learn More
Wastewater Gas Monitoring Application Guide

Thermal mass flow meters help analyze demand, improve efficiency, and reduce waste.

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Greenhouse(GHG) Environmental Monitoring Guide

Monitoring biogas to turn emissions into fuel or carbon credits.

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Thermal Mass Flow Meters for Other Industries


Industrial gas flow meters must be rugged, packed with features and options, and ready to measure out of the box. Plant operators must often keep the process gas flow uninterrupted in order to keep production running.

Industrial gas mass flow meters by Fox Thermal provide easy installation with either insertion or inline style meters. This type of meter operates with no moving parts and offers a wide measurement range (up to 1,000:1, 100:1 typical).

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Oil & Gas

The demand for natural gas has led to offshore exploration and horizontal fraction drilling. The flowback from shale oil plays has many different components that must undergo a process to separate the water/chemical solution from the oil and gas components.

Fox Thermal mass flow meters can accurately measure gas components for accounting and allocation purposes and can monitor exhaust and vent gases for environmental impact.

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Pure Gas

Industrial customers of all types rely on specialty gas producers to supply them with the pure or mixed gases that they need for their processes. Thermal gas mass flow meters from Fox Thermal can help specialty gas producers and industrial process facilities maintain a leak-free system.

Whether used for transfer or submetering of gases such as nitrogen, argon, ethane, helium, and oxygen, thermal mass flow meters are a cost-effective and accurate solution for monitoring the flow of gases.

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ESG Reporting

Flow meters are increasingly being used to help companies meet the emissions criteria for the environmental goals their companies have established as part of their larger Environmental, Social, and Governance (ESG) programs. Thermal mass flow meters can be used to track gas consumption or emissions at facilities.

Fox Thermal customers use our flow meters to proactively monitor their gas emissions and log the data to achieve a positive ESG rating.

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