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What is the steady flow value of the flow meter?

What is the steady flow value of the flowmeter: At present, the standard flowmeters commonly used in the industry indicate that the flowmeter can only be used for steady flow, which is one of the basic error reference conditions of the flowmeter. In fact, all types of flowmeter application steady flow have a threshold, which is the limit of the allowable unsteady flow.
(1) Differential pressure flowmeter The flow velocity fluctuation amplitude of the differential pressure flowmeter can be defined as a steady flow.
(2) Turbine Flowmeter At a given flow rate pulsation amplitude, as the pulsation frequency increases, the turbine flow meter reading tends to rise. For sinusoidal waveform pulsation, the pulsation corresponding to 0.1% system error is 3.5%, so the threshold of sinusoidal pulsation is U lu ≤ o. 035
Laser Doppler and thermal anemometers are typically used to measure flow rate pulsation amplitude. If the flowmeter output pulse frequency is known. Moreover, the turbine inertia is also known, and the actual flow pulsation amplitude can be estimated from the pulsation amplitude displayed by the flow meter, and the correction coefficient can be estimated.
(3) Vortex flowmeter The vortex stripping process of the vortex flowmeter produces a large error with the flow of the artery. A serious problem occurs when the pulsation frequency is close to the vortex shedding frequency. However, under the condition that the pulsation amplitude is sufficiently small, since the pulsation is ignored, measurement errors do not occur. This limit amplitude is only 3% of the average flow rate '2', similar to the flow rate disturbance amplitude.

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