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The flow tube is similar to the venturi in that it places a restriction in the flow that creates a pressure drop. The figure below shows an example of a flow tube that is located in a pipe. From this diagram you can see that the flow tube looks like a short piece of pipe with a thick wall. The front face of the pipe is rounded so that fluid is disturbed as little as possible when it enters the tube. The diameter of the flow tube is approximately half the diameter of the original pipe so that a pressure drop is created as the flow is diverted through the flow tube. A pressure tap is provided prior to the flow tube to measure the higher pressure and directly after the opening of the flow tube to measure the lower pressure. The difference in the pressures must be measured by a pressure differential sensor and the pressure drop is used to calculate the flow.
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