1) Measuring instrument 
An Annubar is similar to a pitot tube used to measure the flow of gas or liquid in a pipe. It provides better accuracy than pitot tubes. The pitot tube measures the difference between the static pressure and the flowing pressure of the media in the pipe. The volumetric flow is calculated from that difference using Bernoulli`s principle and taking....
A device that uses Pitot tubes to measure the gas flow rate within a pipeline.