Energy / Oil & Gas Flow Meter Applications

Get OOOOb/c (Quad O) Compliant with Efficient, Accurate Gas Flow Measurement

Fox Thermal mass flow meters provide flexible, accurate, and cost-effective solutions for a wide range of applications in the energy and oil & gas industries. Frequently used for meeting OOOOb / OOOOc (Quad-O) regulation requirements for gas flow measurement, Thermal mass flow meters from Fox Thermal have a proven track record for accurate flow measurement in flare gas, vent gas, methane gas, and other gas flow measurement applications from upstream to downstream.

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Renewable energy production facility

Top Applications

Fox Thermal Energy and Oil & Gas Flow Meters Provide

Proven Excellence in Flare Gas Measurement

Fox Thermal flow meters have become the go-to measurement choice for flare gas measurement for emissions reporting in the oil and gas industry. Fox Thermal meters have a proven track record for low-flow sensitivity, wide turndown, and negligible pressure drop.

Approved Emissions Reporting and Leak Detection

Fox Thermal flow meters for oil & gas applications help you meet regulatory requirements for reporting flare gas, CO2e, and methane emissions. Our meters provide highly accurate measurements, helping to measure flow, detect leaks, track allocation, and report emissions.

Flexible Measurement Solutions for Changing Gas Mixtures

Fox Thermal mass flow meters with Gas-SelectX® and CAL-V™ calibration validation make it easy to change gas mixtures and retain measurement accuracy while avoiding costs associated with shutdowns for maintenance, replacement, or recalibration.

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Top Flow Meters for Energy and Oil & Gas Applications

fox thermal product ft4X meter

Model FT4X

Advanced Oil & Gas

The Fox Thermal Model FT4X thermal gas mass flow meter comes with a BLM accuracy-compliant data logger which maintains a 7-year history. Specially designed for all types of oil & gas applications including gas refineries, BLM gas leases, Quad O compliance, flares & combustors, etc.

Features include:

  • Insertion, Inline, and Remote configurations
  • DC and AC input power options
  • Gas selection menus
  • Calibration validation
  • Advanced Data logger standard
  • 3/4-inch probe

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fox thermal product ft4A meter

Model FT4A

Cost Effective Oil & Gas

The Fox Thermal Model FT4A includes the Gas-SelectX® gas selection menu and CAL-V™ calibration validation. It is CE, FM, and FMc approved, along with ATEX and IECEx. Applications include gas separators, power plants, vapor recovery units, green completions, and more.

Features include:

  • Insertion and Inline configurations
  • DC input power
  • Gas selection menus
  • Calibration validation
  • 3/4-inch probe

View Model FT4A
fox thermal product ft3 meter

Model FT3

Ideal for Offshore

The Model FT3 was designed with oil & gas customers in mind. This meter is is BSEE compliant and is perfect for use in offshore flare gas applications along with other fuel gas measurements, including sub-metering. It includes the CAL-V™ and Zero CAL-CHECK® features for NIST-traceable calibration.

Features include:

  • Insertion, Inline, and remote configurations
  • DC and AC input power options
  • Calibration validation
  • Data logger with date/time stamp optional
  • Optional display with infrared buttons
  • 1/2-inch probe

View Model FT3

Energy and Oil & Gas Flow Meter Applications

Fox Thermal meters measure flows of gases and gas mixtures in a wide range of energy and oil & gas production applications, including:

  • Flare and Combustor Gas Measurement
  • Gas Compressor Packing Leak Flow Measurement
  • Methane Flow Measurement
  • Combustion Gas Measurement
  • Propane Flow Measurement
  • Hydrogen Gas Monitoring
  • Allocation and Royalties
  • Separator Gas Measurement
  • Fuel Gas Flow Measurement
  • Greenhouse Gas Emissions Monitoring
  • Submeters for Natural Gas Measurement in Allocation and Royalties
  • Tank Vent / Flash Gas Monitoring
  • Natural Gas Totalizers
  • 40 CFR Part 60 Subpart OOOO (Quad O) Reporting
  • 40 CFR Part 98 Subpart W Reporting
  • CO2e Reporting

Help Me Choose A Flow Meter
Natural gas reserves require accurate flow measurement

Energy and Oil & Gas Flow Meters from Fox Thermal

Fox Thermal supplies mass flow meters for a wide range of applications in the energy production sector, including:

  • Hydrogen Gas Flow Meters
  • Flare Gas Flow Meters
  • Natural Gas Flow Meters
  • Methane Flow Meters
  • Propane Flow Meters
  • Carbon Dioxide Flow Meters
  • Vent or Flash Gas Flow Meters
  • Butane Flow Meters
  • Fuel Gas Flow Meters
  • Mixed Gas Flow Meters

Gas-SelectX® and CAL-V™ for Superior Gas Flow Meter Operations

In the modern energy industry, hydrogen production is ramping up to supply power plants with the fuel they need to meet emission reduction goals. Over time, the gas composition is expected to change from being primarily fossil fuels to more hydrogen in the blend. For most flow meter technologies, a gas composition change in the pipe will require that the meter be returned to the manufacturer for recalibration to the new hydrogen-natural gas blend.

The Gas-SelectX® feature, available on Fox Thermal flow meter models FT1, FT4A, and FT4X, allows technicians to program the meter’s gas composition settings while keeping the meter functioning in place and avoiding shutdowns. This reduction in maintenance and shutdown costs improves the overall performance of the site or process.

Another Fox Thermal feature, CAL-V™ calibration validation, allows quick verification of the original NIST-traceable calibration from the factory. A CAL-V™ test can be run anytime and under process flow conditions and is available on the FT1, FT3, FT4A, and FT4X flow meter models.

For future energy production systems, Gas SelectX® ensures that operators transitioning from natural gas to hydrogen gas will be able to change the gas mix in the flow meter settings to account for the gradual increase in hydrogen over time without having to send it back to the factory for recalibration to the new hydrogen/gas blend. Subsequently, the CAL-V calibration validation feature then allows them to ensure that the meter is still measuring accurately after they change to the new gas blend.

Hydrogen gas production

How to Get Flow Meters for Energy and Oil & Gas Flow Measurement

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

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

Enter some basic details in the configurator form

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

Save and submit your application data to us 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

Hydrogen and Hydrogen Blend Use Are on the Rise in the Industrial and Energy Sectors

To develop cleaner solutions for our global energy needs, new methods for producing hydrogen and combining it with natural gas will fuel the need for more accurate energy flow meters.

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Comparing Different Types of Flow Meters

Choose the best technology for your energy, oil & gas application. Thermal mass flow meters are compared with differential pressure flow meters, turbine flow meters, Coriolis flow meters, ultrasonic flowmeters, and positive displacement flowmeters.

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Industries & Applications Where Fox Flow Meters Can Be Used

From pure hydrogen and hydrogen blend monitoring to fuel cells to natural gas transmission, Fox Thermal mass flow meters are the most accurate, reliable, convenient, and cost-efficient solutions on the market today.

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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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Wastewater and Biogas

Communities across the U.S. and the world are updating and improving their aging wastewater treatment facilities. Innovation in wastewater treatment practices that harness biogas for cogeneration are also on the rise. This industry has also been impacted by methane reduction goals worldwide.

Fox Thermal gas mass flow meters can accurately measure the air systems used in aerobic processes and the biogas from anaerobic treatment processes.

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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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