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Allison Engineering

Innovative Solutions for
Process Control

Gas Mass Flow Meters

Our Thermal gas mass flow meters are capable of a wide variety of applications from compressed air, natural gas, biogas, hydrogen, combustion air and flare gas.

They feature all welded, no moving parts, direct mass flow sensors, suitable for dirty, corrosive, low flow applications that conventional flow technologies struggle with. We have been supplying the FCI Thermal flow meters in the UK for over 30 years and have a huge installed base.

Thermal dispersion technology measures  the temperature difference between an active (heated) RTD and a reference (un heated) RTD. This is greatest in a no-flow condition and decreases as flow increases, cooling the heated RTD. Changes in flow velocity and density directly affect the extent to which heat dissipates and, in turn, the magnitude of the temperature difference between the RTDs. The flow meter therefore measures mass flow directly, without the need for additional temperature and pressure corrections.