Thermal Mass Flowmeters

Thermal Mass Flowmeters

Endress+Hauser’s Proline t‑mass thermal mass flowmeters measure mass flow directly by heat transfer, so you can read mass, standard volume, velocity, and temperature without separate pressure/temperature compensation. The portfolio covers inline (t‑mass F 300/500) and insertion (t‑mass I 300/500) designs for utility and process gases, cost‑optimized meters for compressed‑air sub‑metering (t‑mass A/B 150), and a liquid variant (t‑mass T 150) for water‑based services. With no moving parts and negligible pressure loss, they deliver stable, low‑maintenance measurement over a wide turndown.

The t‑mass F/I 300/500 generation adds a patented, drift‑stable sensor that compensates in real time for changes in temperature, pressure, gas type, and flow direction. A built‑in Gas Engine lets you choose from ~21 standard gases and configure multi‑component mixtures (up to 8) for exact operating conditions, while bidirectional measurement and reverse‑flow detection are standard. Heartbeat Technology provides continuous self‑diagnostics and traceable verification, and devices are SIL 2 capable, useful for safety‑relevant services, and compliant proof testing. Measured variables include mass flow, standard volume, density, energy/heat flow, and more.

For plant utilities, t‑mass A 150 (inline, DN 15–50) and t‑mass B 150 (insertion, DN 80–1500 or rectangular ducts) provide cost‑effective monitoring of compressed air, N₂, CO₂ and Ar. They’re built for trending and sub‑metering with 24 V DC power, 4–20 mA HART plus pulse/frequency/switch outputs, guided menus, and self‑diagnostics. Benefits include easy installation, negligible pressure loss, a high operable range at low pressures/velocities, and, on the insertion version, installation and removal without process interruption. These characteristics make them strong choices for utility dashboards and energy programs.

The t‑mass T 150 extends thermal mass to liquids for reliable monitoring of cooling water, heating water, demineralized water/condensate, industrial water, irrigation, and wastewater. Because it measures independently of electrical conductivity, it works in both conductive and non‑conductive aqueous media; a hygienic option supports SIP to 130 °C (266 °F) for up to one hour. As with the gas variants, you get multivariable trending with negligible pressure loss in a compact, maintenance‑lean device, ideal for utility loops and plant balance‑of‑plant.

Use t‑mass for consumption measurement, leak detection, process control, cost allocation, and energy management of compressed air and dry utility gases; for N₂/CO₂/O₂ distribution; for aeration air and large HVAC/ventilation ducts where insertion probes avoid headloss; and for small process lines where inline designs tighten uncertainty. Insertion versions scale to DN 1500; integration is straightforward via HART or Modbus RS‑485, with touch display, WLAN access, and multiple I/Os for diagnostics and data.

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