Influence factor analysis of the accuracy of orifice plate BURKERT flowmeter Currently, BURKERT flowmeter has various flow measurement instruments for different purposes, and its measurement accuracy is generally valued by people. The accuracy of the orifice flowmeter is determined by its structure, measuring principle, the nature of the fluid under test, the conditions of the use environment and the level of manufacturing processes. However, many objective factors in the verification process and in the course of use will affect the accuracy of the orifice plate flowmeter, and even greatly reduce the accuracy of the orifice plate flowmeter, affect the normal use of the orifice plate flowmeter and deviate from the original intention. The main influencing factors are the following points.
A: The actual use accuracy of the BURKERT flow meter flow standard device The BURKERT flow meter is required to use the appropriate flow standard device for verification under various conditions. The actual use accuracy of the verification land flow standard device is higher than that of the orifice flowmeter. For the inspection instrument, it is necessary to inquire whether the verification equipment, method and accuracy meet the requirements.
Two: The flow state of the measured fluid The fluid flowing in the pipeline or in the open channel has different flow conditions, such as laminar flow, turbulent flow, pulsating flow, and non-uniform flow. In particular, the use of Bernoulli's theorem to develop ground orifice flowmeters requires constant flow and uniform flow rates, such as orifice flowmeters. If there is an obstruction in the pipeline, it will cause drastic changes in the flow, leading to a non-negligible error in the measurement results of the orifice plate flowmeter. When the orifice flowmeter is installed, the requirements for the straight section are generally 5 after the first 10, and it is required to minimize the use of bends, valves, and the like.
Three: The Physical Properties of the Measured Medium As of now, each type of orifice flowmeter is normally used under actual conditions. There is no orifice flowmeter that can measure the flow of any medium under any conditions. Flow measurement is a more complex measurement. When orifice flowmeters measure flow, it is not appropriate to measure fluid flow in the viscous ground. When measuring steam, pressure and temperature signals must be collected in the flow table in real time for correction. Ultrasonic orifice flowmeters cannot measure gas. When the measurement fluid contains large and more solid particles, it will greatly affect the measurement accuracy. Therefore, when the accuracy of the orifice flowmeter decreases, it should be noted whether the physical properties of the fluid being measured have changed.
IV: Correct Installation and Use of Orifice Flowmeters The installation and use of BURKERT flowmeters is closely related to its measurement accuracy, especially those borehole flowmeters in which the sensing element is located directly in the flowing fluid. If the concentricity of the orifice plate and the pipe in the orifice flowmeter is not good, an error will occur. In severe cases, the error can reach 100%. Therefore, depending on the degree of requirements for installation conditions, various orifice flowmeters must be strictly differentiated. Only installation in compliance with installation conditions can ensure the accuracy of orifice flowmeters.
The accuracy of BURKERT flowmeters is 0.5 and 1, while the accuracy in actual use is 1.5 or 2. Orifice plate is affected by the straight pipe section before and after the impact, in addition to the installation requirements are relatively high, but also pay attention to the range ratio is not too large (usually 3:1). Because the fundamental reason that influences the accuracy of the orifice flowmeter measurement is whether the geometric shape and flow dynamics of the throttling device deviate from the design standards, the system must be regularly calibrated and maintained in the use process. For practical use, the pressure and temperature Changes in operating conditions and other parameters should be corrected in time. Fully-compensated flow totalizers can be used to integrate the calculation program to reduce measurement errors and ensure metering accuracy. Orifice flowmeter is a kind of instrument that requires very strict from design, manufacture to installation and use. Any mistake in one link will cause a great error. Therefore, if the standard is strictly followed, accurate measurement is guaranteed. The repeatability of the orifice flowmeter is lower than that of other orifice flowmeters (vortex street orifice flowmeters, ultrasonic orifice flowmeters, and electromagnetic orifice flowmeters) because the output signal is susceptible to interference due to analog values. In particular, the differential pressure and pressure-inducing pipeline can easily cause interference fluctuations in the signal. It is precisely because the repeatability is not high, which affects its accuracy.
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