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Thermatel® TA2 thermal mass flow meter

The Thermatel® Model TA2 is an easy-to-use, economical, continuous gas flow meter that is often utilized to manage energy costs or to meet environmental regulations in a variety of industries. TA2 total cost of ownership is reduced through ease of installation, calibration verification in the field and reduced maintenance with no moving parts or ports to plug. Since the measurement is based on heat transfer, the TA2 has reliable performance at low gas flows and pressures where other technologies have difficulties.

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Thermal mass flow meter technology

Thermal flow meters are primarily used in air and gas flow measurement applications. The meters consist of a transmitter and probe with temperature sensors (RTDs) located in the pins at the bottom of the probe. One sensor measures the process temperature and the other sensor is heated to a specific temperature above this. As the flow rate increases, heat gets taken away from the heated sensor in the form of convective heat transfer.

Features

Direct mass flow measurement of air and gas
Excellent low flow sensitivity with high turndown (rangeability)
Process temperatures to +400 °F (+200 °C)
Rotatable housing
FM / FMc / ATEX / IEC approvals
Resettable and non-resettable totalizers
Calibration verification in the field

Options

Pulse and second mA output for temperature
Plug in display with keypad
HART® / Foundation fieldbus™ / AMS® / PACTware™ communications
Remote electronics
Hot tap retractable probe

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.