Fox Thermal Mass Flowmeter Product Catalog

Fox Thermal Instruments continues to lead the market in innovative, reliable, accurate, and full-featured flow meters. They provide high quality, cost effective solutions with superior performance and outstanding on-time delivery. Fox continually beats the competition with high quality flow meters and superior customer service.

Fox has decades of experience in thermal flow design, application and manufacturing techniques and supplies accurate and full-featured flow meters to industrial OEMs and end-user customers.

This catalog provides information about the full Fox Thermal line of accurate, innovative and reliable thermal mass flow meters that are used in a wide variety of industrial gas flow and emissions monitoring applications.

For more information, contact Classic Controls, Inc. Call them at +1 863-644-3642 or visit their website at https://classiccontrols.com.

Thermal Mass Flow Meters for Combustion Efficiency Control and Monitoring

Example of inline thermal mass flow meter
Image Courtesy Fox Thermal Instruments

Fox Thermal Instruments, a recognized leader in the manufacture of thermal mass flow meters, has authored a white paper entitled "Reduce Energy Costs and Enhance Emissions Monitoring Systems" which provides a technical view of how the use of thermal mass flow measuring technology can be effectively employed on combustion based systems to provide efficient energy usage. Combustion efficiency contributes to the financial benefit of an operation, as well as enabling compliance with emission requirements.

Thermal mass flow measurement is a well regarded mature technology in industrial process measurement and control applications. The instrument returns a mass flow reading by measuring the heat dissipating effect of the media flow on a temperature sensor. Heat transfer is proportional to the mass flow.

The mass flow measurement instruments are very popular for several reasons. They have no moving parts, have a fairly unobstructed flow path, are accurate over a wide range of flow rates, calculate mass flow rather than volume, measure flow in large or small piping systems, and do not need temperature or pressure compensation.

The white paper is provided below for you to read. It is informative and will prove a good investment of time to read. Share your flow measurement challenges of all types with process instrumentation specialists, combining your own process knowledge and experience with their product application expertise to develop effective solutions.

Thermal Mass Flow Meters Reduce Energy Costs and Enhance Emissions Monitoring from Classic Controls, Inc.

Thermal Flowmeters with Constant Temperature Differential (∆T) Technology to Measure Mass Flow Rate of Air and Gases

Thermal Flow Meter
Sensor
Fox Thermal Instruments

Thermal flow meters use a constant temperature differential (∆T) technology to measure mass flow rate of air and gases. The thermal mass flow sensor consists 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 or Hastelloy tubes.

The reference RTD measures the gas temperature. The instrument electronics
heat the mass flow sensor, or heated element, to a constant temperature and measures the cooling effect of the gas flow. The electrical power required to maintain a constant temperature differential is directly proportional to the gas mass flow rate. The microprocessor then linearizes this signal to deliver a linear 4 to 20mA signal.

One manufacturer, Fox Thermal Instruments, implements a

technology they call the Power Pro™ Sensor. Their sensor operates at a higher power level than other competitive thermal technologies, providing better response time and wider turndown. When compared to a typical differential pressure type flow meter, as shown to the right, the Power Pro™ Sensor offers better low flow or low end sensitivity. The Power Pro™ Sensor also provides exceptional accuracy at high velocities - up to 50,000 SFPM air.

The Fox DDC-Sensor™ is a new state of the art sensor technology used in the Fox Model FT1 Thermal Gas Flow Meter. The DDC-Sensor™, a direct digitally controlled sensor that is interfaced directly to the FT1 microprocessor for more speed and programmability.

Like the Power Pro™ Sensor, the DDC-Sensor™ accurately responds to changes in process variables (gas flow rate, pressure, and temperature) which are used by the microprocessor to determine mass flow rate, totalized flow, and temperature.

In addition to measuring flow, the DDC-Sensor™ provides a technology platform for calculating accurate gas correlations. The FT1 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. Fox’s Model FT1 with its DDC-Sensor™ and state-of-the-art correlation algorithms provide an accurate, multi-gas capable thermal flow meter for gas applications.

Thermal Mass Flowmeter and Temperature Transmitter from Classic Controls, Inc.