About Us

After more than 25 years of manufacturing thermal gas mass flowmeters, Fox Thermal continues to lead the market in innovative, reliable, accurate, and full-featured flow meters. Our exceptional team of mechanical, electronic, and software engineers have helped to shape the thermal mass flow measurement industry.

Our goal is to serve a broad array of global customers by consistently providing high quality, cost effective solutions to our customers, with superior performance and outstanding on-time delivery. Explore the Fox Facility, Technology, and the extensive awards and certifications of Fox Products by navigating the menu to the right.

Fox Facility

The 19,000 ft² Fox manufacturing facility houses administrative offices, a certified weld shop, an assembly work shop, and several state-of-the-art calibration labs. Our highly-trained staff ensures efficient, high-quality production and helps us maintain our technology and quality leadership position in the thermal mass flowmeter industry.

In an effort to improve delivery time, meet surge demands from our customers, and continue to manufacture on-shore, Fox continually upgrades our facility and systems.

Brands

ONICON Measurement Solutions Acquisition

Effective April 24, 2019 ONICON Measurement Solutions is pleased to announce the company has been acquired by the TASI Group ( www.tasigroup.com ). The TASI Group is a privately-owned industrial business focused on Test, Measurement, Inspection, and Assembly instruments and equipment. All ONICON Measurement Solutions business units (ONICON, Air Monitor, Fox Thermal, Seametrics, Greyline and Pulsar Process Measurement) are included in this transaction. The ONICON Measurement Solutions companies will become part of the existing TASI Flow Group of companies which are currently comprised of AW-Lake Company, Exact Dispensing Systems, KEM GmbH, Litremeter, SignalFire Wireless Telemetry, and Vogtlin Instruments. John Norris, current president of ONICON Measurement Solutions, was named as President of the TASI Flow Group and will report to John McKenna, TASI Group President and CEO.

John Norris comments that “ONICON Measurements Solutions joining TASI Flow is a great next step in our continuing development as a premier flow and level measurement business. Together we have an impressive and extensive technology offering to better serve our customers around the globe and fuel further growth.”

All ONICON Measurement Solutions companies will continue to serve their customers by manufacturing quality flow and energy measurement devices and will honor their commitments to their customers with excellent customer service. The ONICON family of companies is excited about this acquisition and looks forward to continued business with you going forward.

  • Has ONICON been acquired?
    • Yes. Effective April 24, 2019 ONICON became part of the TASI Group. This is a large, multi-national, company with businesses focused on Test, Measurement, Inspection and Assembly instruments and equipment. They have a significant Flow Group that we will be joining. It is a privately held, family owned business that has been in existence for many years.
  • Does this include all ONICON companies (ONICON, Greyline, Pulsar, Fox Thermal, Air Monitor, and Seametrics)?
    • Yes.
  • What changes will happen to the business?
    • Inventory is complete and shipments have resumed as of Friday, April 26th. Thank you for your patience.

      In the longer term, we will be the major part of the TASI Flow Group of companies. We are expected to continue to execute our plans and to be successful in the market.
  • Is a move contemplated?
    • No move is contemplated.
  • Any changes to how we order products?
    • Not in the foreseeable future.
  • Is it possible to gain access to other TASI Flow Group products through ONICON?
    • It is too early to tell. Please forward to sales management.
  • Have the company names changed? Will we need a new W-9? Will your Remit-to address change?
    • No changes are anticipated in how we do business together.

Explore all the brands in the TASI Flow Group below:

Air Monitor

Air Monitor has been delivering airflow measurement solutions since 1967 – 50 years! We are the premier solutions provider for the Commercial HVAC, Industrial Process, and Power Generation markets. We are the only dedicated airflow solutions provider with expertise in differential pressure and thermal dispersion measurement technologies.


AW-Lake Company

AW-Lake Company manufactures inline, positive displacement, mass Coriolis, variable area and turbine flow meters with an impressive array of electronic output and control options including; electronic sensors, inline optical sensors, flow switches/alarms and transmitters. The company’s flow monitoring products can be found in a broad array of market applications in the oil & gas, transportation, industrial, process, sanitary and medical/life sciences market segments.


Exact Dispensing Systems

Since 1978, Exact Dispensing Systems have designed and manufactured high quality equipment for the dispensing of single component fluids and plural component reactive resins such as epoxies, urethanes and silicones. Their materials and application expertise helps clients make the best decisions regarding their specific dispensing application. The EXACT staff members always take the time to understand the customer’s process requirements and then develop a valid, sensible, cost-effective dispensing solution to meet those needs.


Fox Thermal

After more than 20 years of manufacturing thermal gas mass flowmeters, Fox Thermal continues to lead the market in innovative, reliable, accurate, and full-featured flow meters. Our exceptional team of mechanical, electronic, and software engineers have helped to shape the thermal mass flow measurement industry.


Greyline

Greyline is a worldwide leader in ultrasonic instrumentation for industrial and environmental markets. We develop, manufacture and market industrial flow and level monitoring instruments including ultrasonic level transmitters, flow meters and open channel flow meters. Greyline’s primary market is environmental – especially water and wastewater treatment systems.


KEM Küppers Elektromechanik GmbH

With more than 50 years of experience, complemented by innovative and customer-specific product development, KEM Küppers Elektromechanik GmbH is an expert in flow measuring technology and calibration. KEM is an independent, vertically integrated manufacturer that designs and produces standard and customized mechanical or static flow meter solutions.


Litre Meter

Litre Meter has been manufacturing flow meters since 1975 and positive displacement flow meters since 1986. This reservoir of knowledge is used to expertly select the appropriate meter technology and provide effective flow measurement solutions. Main markets are chemical injection and hydraulic applications in the Oil & Gas sector worldwide.


ONICON

ONICON Incorporated has been delivering market leading flow and energy measurement products since 1987. For more than 30 years we have been exclusively focused on delivering quality engineered flow and energy measurement instruments for hydronic heating and cooling systems. Our broad range of product solutions are wet-calibrated, fully programmed for your application, and ready to use right out of the box.


Pulsar Process Measurement

Pulsar Process Measurement Ltd manufactures and supplies level, volume, open channel flow, pipe flow, sludge interface measurement and pump control instrumentation. Since 1997, Pulsar has risen to become one of the world-leading non-contacting measurement instrumentation manufacturers and their products are used in a wide variety of industries and applications worldwide.


Seametrics

Seametrics, an ONICON Measurement Solutions business, is a designer and manufacturer of a wide variety of flow metering and submersible sensor products. Since 1990 we have provided innovative solutions to users in irrigation, fracking, water treatment, groundwater, surface water, and chemical processing applications. Our products have a reputation for durability and accuracy at a competitive price, and are sold through a network of domestic and international distributors.


SignalFire

SignalFire’s unique Open Architecture Wireless Mesh Network permits users to create wireless sensor networks using the sensors and actuators best suited for the job rather than the a wireless option provided by a sensor vendor. SignalFire’s intrinsically safe battery powered nodes can power both the attached sensors and the wireless system making the system truly wireless.


Vögtlin Instruments GmbH

Vögtlin Instruments GmbH is a Swiss designer of gas flow measurement and control instruments. Vögtlin has over 25 years of experience in designing and manufacturing high precision thermal mass flow meters and controllers, variable area flow meters and control valves. The core competence on calibration and OEM solutions together with the aplication expertise throughout its worldwide sales partner network make Vögtlin a strongly respected player in various industrial fields such as medical, biotechnology, surface treatment, coating & hardening and new energy.


Our Technology - How it Works


All thermal Gas Mass Flow Meters from Fox utilize the thermal sensing principle, a proven, accurate direct mass flow measurement technology. This technology performs at high levels of accuracy for a wide variety of gases.

Fox Thermal Flow Meters use a constant temperature differential (constant Δ T) technology to measure mass flow rate of air and gases. Fox Models FT2A and FT3 are equipped with the PowerPro™ Sensor while Models FT1, FT4A & FT4X have the DDC-Sensor™. Both thermal mass flow sensors consist of two Resistance Temperature Detectors (RTD’s). The sensor elements are constructed of a reference grade platinum wire wound around ceramic mandrels that are inserted into stainless steel tubes.

Benefits of Thermal Mass Flow Technology

There are many benefits of thermal gas mass flow meters over other flow measurement technologies and Fox Thermal leads the industry for accuracy, quality, and innovative design. Benefits of Thermal Mass Flow Technology:

  • Direct mass flow measurement of air and gases in standard volumetric units (e.g., SCFM or NM3/H) or mass units (e.g., LBS/M or KG/H)
  • No additional pressure or temperature compensation required
  • Repeatability and exceptionally broad measurement range: up to 1000:1 (100:1 typical)
  • Standard linear 4-20mA output proportional to mass flow rate
  • Low pressure drop
  • No moving parts
  • Cost-effective
  • Insertion, Inline & remote* styles
  • Measures flow rate and temperature

The Fox Thermal Difference:

  • Microprocessor-based, field-rangeable electronics
  • DDC-Sensor™ proprietary flow sensor design*
  • Gas-SelectX® field selectable gases / gas mixes without affecting accuracy*
  • CAL-V™ and Zero CAL-CHECK® Calibration Validation*
  • Free FT View™ Software to configure meter, print calibration validation certificates, run simulations, and more!*
  • Data Logger with 7-year history*

*features vary by model number


DDC-Sensor™

The Fox 2nd generation DDC-Sensor™ is a new state-of-the-art sensor technology used exclusively in the Fox Models FT1, FT4A & FT4X Thermal Gas Flow Meters. The DDC-Sensor™, a Direct Digitally Controlled sensor, is unlike other thermal flow sensors available on the market. Instead of using traditional analog circuitry, the DDC-Sensor™ is interfaced directly to the meter's microprocessor for more speed and programmability.

Fox’s unique DDC-Sensor™ provides a technology platform for calculating accurate gas correlations. The correlation algorithms allow the meter to be calibrated on a single gas in the factory while providing the user the ability to select other gases in the Gas-SelectX® gas menu(s).

Competitors' sensors utilize fragile, cantilevered (only welded at one end) elements, whereas the sensor elements of the DDC-Sensor™ are welded to the sensor window at both ends for extra stability and strength. This enhanced design eliminates the sensor element vibration - found most often at high flow rates - which can potentially lead to metal fatigue and failure.

The sensor elements are in direct contact with the process flow. In applications where slag, ice or other foreign particles are traveling down the pipe, cantilevered elements are subject to damage requiring factory repair. The Fox 2nd generation non-cantilevered sensor design is much more rugged and robust.

Fox Models FT1, FT4A & FT4X, with their DDC-Sensor™ and state-of-the-art correlation algorithms provide an accurate, multi-gas-capable thermal gas flow meter.

PowerPro Sensor™

Compared to a typical Differential Pressure type flowmeter, the PowerPro™ sensor offers better low flow or low end sensitivity and exceptional accuracy at high velocities.

The PowerPro™ Sensor operates at twice the power level than competitor sensors to achieve a higher sensitivity to flow; even at very low flow rates. A wider measurement range - 50 to 60,000 SFPM – and a fast response time (0.9 seconds) make the flowmeters that use the PowerPro™ Sensor able to measure accurately for a long list of industries and applications.


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