Thermal Mass Flowmeter


Endress+Hauser releases the Proline t-mass 150 thermal mass flowmeter for measuring gases such as compressed air, nitrogen, carbon dioxide and argon. The flowmeter measures mass flow, gas temperature, free air delivery, and corrected volume—all without the need for pressure or temperature compensation. The t-mass 150, with its high turndown of 100:1, can reliably measure small gas quantities at very low operating pressures, making it suitable for applications such as leak detection, process control, cost allocation, analysis of flow profiles and energy management. It has a 4-20 mA output with HART and a pulse/frequency switch output, allowing easy connection to control and energy management systems. 

The flowmeter operates in temperatures from -40 to 212ºF (-40 to 100ºC) and pressures up to 580 psi (40 bar), and measures mass flow up to 2.4 million lb/hr with negligible pressure loss. The stainless steel flowmeter has CSAus and ex approvals for use in Class 1, Division 2 areas. The t-mass 150 has a Gas Engine—an embedded flow computer—that makes it possible for the flowmeter to change from one gas to another without the need for recalibration, and its thermal measuring principle requires no pressure or temperature compensation. Continuous self-diagnostics monitor the flowmeter for device and process errors. The t-mass 150 is available in insertion, in-line or hot-tap versions for installation in rectangular ducts or pipes from 1/2 to 60-inch. The flowmeter can be supplied with welded flanges, lap-joint flanges or threaded connections.


  • for measuring gases
  • turndown of 100:1
  • 4-20 mA output

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