The installation of mass flowmeter protection accessories is to ensure the normal operation of the flowmeter

The installation of mass flowmeter protection accessories is to ensure the normal operation of the flowmeter. For example, in positive displacement flow meters and turbine flow meters, it is generally necessary to install filters and other necessary equipment upstream. It should be noted that the installation of these devices cannot affect the use of the flowmeter. Corrosion and fouling affect changes in flow measurements that vary by flowmeter type. For example, if the inner diameter of the flowmeter is 50mm, if the scale on the inner wall is 0.1~0.2mm, the area of ​​the measuring pipe will be reduced by 0.4%~0.6%, and the resulting error will be a deviation that cannot be ignored for a flowmeter of class 0.5~1.0. At present, most flow measurement systems, whether it is the mass flowmeter itself or its accessories, have electronic equipment, and the power used must match the flowmeter. When the output level of the flowmeter is low, a preamplifier suitable for the environment should be used. The output signal of some types of flowmeters is easily interfered by high-power switching devices, which will make the flowmeter output pulse fluctuate and affect the performance of the flowmeter. The signal cable should be as far away from the power cable and power source as possible to reduce the influence of electromagnetic interference and radio frequency interference. . How to solve the problem of inaccurate mass flowmeter readings 1. Problems existing in the mass flowmeter itself: Check whether the flow coefficient configured by the mass flowmeter is consistent with the nameplate coefficient Check whether the mass, volume and density meter coefficients are 1.0000 Check the cumulative flow rate of the receiving equipment Whether there is a difference between the value and the accumulated value of the flowmeter Check the damping settings of mass flow, density and temperature Check the measuring unit of the meter Check the alarm information Whether the pipe is always full, check whether there is a gas-liquid two-phase state. In the occasion where the batch flow rate is small and the pressure changes greatly, a metal pipe flowmeter should be used. 3. Issues that should be considered when the mass flowmeter cooperates with the reference equipment: When comparing with the flowmeter, the rated accuracy of the reference flowmeter should be considered when comparing with the weighing equipment. When comparing the impact of the degree value on the batch size with volume equipment, the accuracy of the volume meter of the container, the measurement accuracy of variables such as liquid level, temperature and density, and the influence of air buoyancy should be considered when comparing small batches. Influence, the influence of the time difference of collecting data should be considered during periodic data collection

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