Thermal Mass Flow Meters

Thermal Mass Flow Meters

Thermal mass flow meters measure flow by introducing heat into a flow stream and measuring the dissipation of heat between temperature measurement points. They are very popular because they provide a fairly unrestricted flow path, have no moving parts, are accurate over a wide range of flow rates, work well on large or small pipes, don’t require temperature or pressure compensation, and actually calculate mass flow rather than volume. In most cases, thermal flow meters are used to measure and monitor flowing gases, but in some cases they are used to measure the flow of liquids.

Fox Thermal Instruments, located in Marina, CA, manufacturers some of the most innovative and reliable thermal mass flow meters today. Their products are used in a wide variety of industrial gas flow and emissions monitoring applications.

Fox Thermal provides basic models:

Model FT1:

Winner of the 2015 Flow Control Innovation Awards, is the newest Thermal Gas Mass Flow Meter offered from Fox Thermal Instruments.  The Model FT1 was nominated for this award because of its innovative design elements such as the DDC-Sensor™ technology platform that allows it to operate using the Gas-SelectX® gas menu selection tool.

Model FT2A:

The Model FT2A continues to accurately measure gas flow rate in standard units without the need for temperature and pressure compensation. Some additional features available on the FT2A include a standard display, a standard USB port to connect to a PC, and the option of BACnet MS/TP communication protocol.

Model FT3:

The Model FT3 measures gas flow rate in standard units without the need for temperature and pressure compensation.  Calibration Validation, using the CAL-V™ and Zero CAL-CHECK® features, is an in-situ calibration routine that validates the flow meter’s accuracy by testing the functionality of the sensor and it associated signal processing circuitry.

Model FT4A

The Fox Thermal Model FT4A was the first meter to use the expanded Gas-SelectX® gas selection menu and the 3rd Generation DDC-Sensor™ design. The Gas-SelectX® gas menu feature for the Model FT4A flowmeter. Gas-SelectX® allows the user to choose from a menu of several common gases or gas mixtures for their application.

Model FT4X

The Fox Thermal Model FT4X comes equipped with an advanced intrinsic Data Logger for advanced record-keeping and data retention. Data logging is commonly used in applications such as flare and waste gas monitoring, gas studies, gas royalties and allocation, and gas flow research.

For more information about thermal mass flow meters, contact CTi Controltech. They can be reached by calling (816) 353-6550 or by visiting their web site at