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Proline t-mass F/I 300/500 coming soon

The flowmeter with long-term stability and a keen sense for utility gases

Whether compressed air, natural gas, protective gas or oxygen, end users who want to record gas flows with proven and robust state-of-the-art measuring technology no longer have to make compromises. The ingenious sensor design and one-of-a-kind monitoring functionality of the t-mass F/I 300/500 leave nothing to be desired in terms of optimum process control. Even when process conditions fluctuate significantly, gas flows can be measured in all industries with unmatched accuracy.


  • The reliable and versatile all-rounder flowmeter for pure gases and gas mixtures with numerous alarm functions as well as bidirectional measurement and reverse flow detection

New possibilities

In numerous industries, thermal flow measuring technology has long been used for measuring pure gases and gas mixtures. For example, in research and development labs, measuring flare stack and flue gases, in utilities with compressed air, oxygen, nitrogen or argon, etc. As a result, when combined with the comprehensive functionality of the Proline 300/500 transmitters, this opens up possibilities for process control, quantity measurement, leak detection, cost allocation and energy management.

Robust and resistant

Even when process and ambient conditions significantly fluctuate, t-mass ensures high measuring accuracy (±1.0%) with excellent repeatability (±0.25%). Gas flows with low pressure and a low flow velocity can also be measured easily thanks to the high turndown. The robust industrial design makes it possible to operate the device over the long-term without any maintenance, saving time and money for the user. t-mass F and I are used at process temperatures up to 356°F and pressures up to 580 psi.

Gas engine - for highest process flexibility

The t-mass 300/500 measuring system is equipped as standard with a “Gas Engine.” This software model enables, among other things, calculating the mass flow of a gas under the current process conditions. The Gas Engine offers other advantages:

  • Calculating flow velocity, reference density, corrected volume and energy flow for current operating conditions

  • Dynamic correction for changes in pressure, temperature and gas composition

  • Changing programmed gases without recalibration

  • And more!

Alarm functions for greater process reliability

The t-mass 300/500 measuring system has been developed in accordance with IEC 61508, SIL 2 and can serve as the preferred system in safety applications. Any device or process errors that may occur are indicated and clearly categorized to NAMUR NE107 standards. The t-mass 300/500 is equipped with alarm functions used for immediately detecting unwanted condensate drops on the sensor or pulsating flow and it can measure and account for gas flows in both flow directions, detects reverse gas flows.