Lauris Technologies FC1223-M ultrasonic gas flow meter

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Lauris Technologies (LaurisTech) has announced the addition of a molecular weight and mass flow measurement capability to the FC1223 ultrasonic gas flow meter.

The meter is built on a transit-phase method which allows volume flow measurement of highly turbulent gas flows. The method is fundamentally insensitive to the speed of sound in the moving fluid. This advantage, consequently, turns into a challenge for determining the molecular weight or mass flow for this type of meter.

LaurisTech overcame this challenge by developing a molecular weight and mass flow measurement technique in which the meter uses gas velocity to provide the mass flow measurement.

The mass flow of flare gas can alternatively be measured by thermal mass flow meters. However, this type of flow measurement is not suitable for flare gas metering because the output of thermal mass meter is governed by the gas velocity and the composition of gas. The known gas composition actually removes the need for mass flow measurement, as the density can be calculated from the chemical composition of the gas at the operating pressure.

Similarly, Coriolis flow meters also provide direct measurement of mass flow independent of gas composition, but flow obstruction and limited pipe size make them impractical for flare gas measurement.

The mass flow measurement capability will be offered in LaurisTech’s model FC1223-M ultrasonic gas flow meters.