1. 
   Annubar
   An annubar is similar to a pitot tube used to measure the flow of gas or liquid in a pipe. 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 tak...
   Found op http://en.wikipedia.org/wiki/Annubar
   
   
2. 
   Annubar
   A device that uses Pitot tubes to measure the gas flow rate within a pipeline.
   Found op http://www.contractorsunlimited.co.uk/glossary.shtml
   
   

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