The wrong orifice meter? What is the effect?

The wrong orifice meter? What is the effect? Orifice meter at the time of installation shall be carried out in strict accordance with the specification, but individual users at the time of installation accidentally installed backwards, what should I do this time? What is the effect of measurement? Flow rate and orifice differential pressure before and after a certain proportion relations, but it must be the differential pressure, the greater the flow, in order to measure accurately, only have orifice chamfering, to increase the differential pressure, and orifice plate upside, the poor reduce small, of course flow display becomes small. For orifice flow inside edge is 45 degrees of inclined blade, so also known as the orifice plate. Set the blade's purpose is to let the gas to the orifice can rapid decompression improve velocity and then quickly release, to increase the pressure difference before and after the orifice plate, and then calculated according to the differential pressure flow, the Bernoulli equation is used to calculate. There will be a vena contracta after orifice, gas velocity and pressure is small, here is according to the vena contracta in pressure and differential pressure in front of the orifice to calculate. Cannot reach after the wrong when the pressure difference before and after rapid decompression orifice plate is decreased, and the flow rate and pressure difference before and after is proportional to the, so the display will be smaller. Orifice meter installation note: orifice to mention on the handle or flange cylindrical surface with '+', '- ', '+' as the upstream side, not against. Through the above we believe that everyone has to understand the interpretation of the orifice meter installation must not put wrong, otherwise it will affect the measurement result. So remind everybody when installing any flow meter, pay attention to the correct installation.

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