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A device which measures differential fluid pressure using two tubes; a dynamic tube pointing upstream into the flow, and a static tube pointing at right angles to the flow or optionally downstream away from the flow. The differential pressure measured across the tubes is proportional to the velocity of the fluid in which the tubes are immersed.
Pitometers are widely used to meaure water or gas flow in pipes, as they offer minimal restriction to the flow.
A pitometer inserted into a water or gas pipeline and connected to two pressure gauges, will display two different pressures, the upstream pressure being higher than the downstream pressure. From this differential pressure, the flow of the water or gas in the pipe can be calculated. Typically pitometers are supplied with a set of differential pressure look-up tables for different fluids.
by waterworker December 05, 2013
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