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BOOCCA cone shape flow meter---- you can see the flowing contrail of water vapor clearly from its profile, the water flows towards the biggest cone body from negative pressure port along the pipewall, due to the effective current area varies small, the water close to the pipe wall gradually flow quickly, and there is no coagulated water accumulating, so the water vapor can not influence the differential pressure Beta.
Orifice-plate flowmeter---- at the upriver of the orifice-plate flowmeter, due to the air velocity of flow is quite low, thereby the water velocity of flow is also quite low, so in every other 3-4 secs, there is a drop of water coming out, and after several minutes, there are large numbers of coagulating water coming out, which accumulate on the negative pressure port of the orifice-plate flowmeter. It will disturb the signal periodically in every other 7-8 secs.
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Flow instruments
