September 2013, Vol. 240 No. 9


New Technology For Gas Flow And Composition

Quantitech has launched an in-pipe gas flow monitoring technology that can also measure gas composition or purity. Unlike other methods, this measurement is not affected by the gas composition, temperature, density, viscosity or pressure, and there is no obstruction at the measurement point.

When the speed of sound (SoS) in a gas is measured along a path in both directions simultaneously, the difference in the measured velocities is proportional to the gas velocity along the pipe. Measurements at 100 mbar are feasible and flow rates between 0.01 l/min and 200 l/min are possible in pipes up to 200 mm in diameter.

For the qualitative monitoring of single gases, any change in the SoS measurement will indicate that the purity of the gas has changed. For mixtures of two gases, SoS is a combination of the two main gas components, so there is a simple calculation to derive the proportion of each component.

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