Magnetrol Thermal Dispersion Flow Meter Model TA2

The Thermatel® Model TA2 thermal mass flow transmitter, based on thermal dispersion technology, provides reliable mass measurement for air and gas flow applications. The powerful, yet easy-to-use, electronics are contained in a compact explosion-proof enclosure. The TA2 is available with both insertion probes, as well as flow body design for smaller pipe sizes. The TA2 offers excellent performance at an exceptional value.

The TA2 offers the user the ability to verify calibration in the field, reducing the need for periodic recalibration.

Operating Principle

THERMATEL Model TA2 mass flow transmitter measures mass flow by detecting heat dissipation from a heated surface. The sensor contains two mass balanced elements with precision matched RTDs. The reference sensor measures the process temperature (up to +400° F [+200° C]); the second RTD measures the temperature of the heated sensor. The power to the heater is varied to maintain a constant temperature difference above the reference temperature.

There is an inherent non-linear relationship between power and mass flow. The microprocessor in the TA2 compares the power against the calibration curve and converts the power requirements to the mass flow rate. Temperature is also measured to provide temperature compensation of the mass flow over the operating range of the instrument.


  • Combustion Air
  • Compressed Air
  • Natural Gas
  • Aeration Air
  • Digester/Biogas
  • Vent Lines/Flare Headers
  • Hydrogen Lines
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