Why is a DN50 flow meter not used for a DN50 pipe, but instead a DN25 flow meter?
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Why is a DN40 flow meter not used for a DN40 pipe, but instead a DN25 flow meter?
It is necessary to calculate the appropriate flow rate based on the type and design of the flow meter. Ensure a certain level of precision while minimizing pressure loss. Price also plays a role.
I’d venture to guess that this is an electromagnetic flowmeter for measuring water. It should be a 40-diameter pipe; the flow velocity at normal operating conditions is relatively low, so a reduction in diameter is necessary to increase the flow velocity and ensure measurement accuracy.
Agree with what was said above: increasing the flow rate ensures measurement accuracy.
It’s probably due to considerations regarding flow rate and measurement range
The necking has occurred; for better measurement, it’s possible that the pipe diameter is 40 mm or the flow rate is low
25 enables full-tube measurement, resulting in more accurate results
This is related to the principle of flow meters. If an electromagnetic flow meter is used, only the conductivity of the medium and the characteristics of the pipe need to be taken into consideration. If a vortex flow meter is chosen, it is necessary to conduct calculations, taking into account factors such as the flow velocity of the medium and the pressure in the pipe; only then can the appropriate diameter be selected. Of course, it is also possible to use reduced-diameter versions, where the diameter at the flange connection remains the same, but the inner diameter is smaller. I hope this information helps you.
Shrinkage, to better suit the measurement of operating condition data
The tassels are too low~, resulting in too low a flow rate. The accuracy is below its minimum guaranteed measurement level; the pipe diameter contracts, increasing the local flow velocity. Increase the flow rate per unit.