How to check flow meter calibration

Abstract: The information on how to verify the flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. 1. Overview There are many types of flow measuring instruments, and their measurement principles, instrument structures, operating conditions and installation methods are different. In order to make the flow values ​​of various instruments produced by various manufacturers uniform and achieve a certain measurement accuracy , must be correct. For more flow meter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on how to verify the flow meter. 1. Overview There are many types of flow measuring instruments, and their measurement principles, instrument structures, operating conditions and installation methods are different. In order to make the flow values ​​of various instruments produced by various manufacturers uniform and achieve a certain measurement accuracy , it is necessary to calibrate or verify the flow meter newly manufactured or in use. It is a variety of flow standard devices that can realize calibration or calibration of flow meters. 2. Calibration method of flow meter In order to obtain the flow value of the flow meter and its measurement accuracy, it is necessary to perform flow calibration or calibration on each flow meter. The calibration of flow meters generally has two methods: direct measurement method and indirect measurement method. The direct measurement method, also known as the real flow calibration method, is based on the actual fluid flowing through the instrument to be calibrated, and then using other standard devices (standard flowmeter or flow standard device) to measure the actual flow through the instrument to be calibrated. Compare the flow value of the instrument being calibrated, or divide the instrument to be calibrated. This calibration method is also called wet calibration. The flow value obtained by the real-flow calibration method is reliable and accurate, and it is the most reliable and accurate value for many current flow meters (such as electromagnetic flowmeters, positive displacement flowmeters, turbine flowmeters, vortex flowmeters, rotameters and Coriolis mass flowmeters). etc.) The method used in the verification is also the method for establishing the standard flow at present. The indirect measurement method is to measure the structural size of the flow meter sensor or other quantities related to the calculated flow, and use it according to the prescribed method, and indirectly check the flow value to obtain the corresponding accuracy. This method is also known as dry calibration relative to wet calibration. The flow value obtained by the indirect method is not as accurate as the direct method, but it avoids the difficulty of having to use a flow standard device, especially for large flow devices. Therefore, some flow meters have adopted the indirect calibration method. For example, the orifice plate, nozzle, venturi tube, etc. have been standardized in the differential pressure flowmeter, and a wealth of test data has been accumulated, and there are corresponding standards, so the flow value of the standard throttling device can be used to check the throttling parts. The differential pressure gauge (differential pressure transmitter) matching the geometric size and calibration is carried out indirectly. The indirect verification method of the target flowmeter is realized by calculating the flow value by the hanging weight method on the basis of measuring the size of the target and the pipeline. Some foreign manufacturers have carried out the indirect calibration method for the float flowmeter, that is, only the geometric size of the float and the cone tube and the importance of the float are checked to determine the flow rate, and its accuracy is slightly lower than that of the real-flow calibration instrument. Although the elbow flowmeter has not yet been standardized, due to the low requirements for its measurement accuracy, the indirect calibration method can also be generally used, the super-transducer, and the super-fluid flowmeter clamped outside the pipeline to set the actual parameters. The above is also dry calibration. Although the indirect calibration method of some flow meters is always the most important flow calibration method, even the standard throttling device that has been standardized, sometimes the operating conditions exceed the range specified by the standard, or in order to obtain higher measurement accuracy, still Real-flow verification method is required for verification. There are many methods for the calibration of flow meters, but the real-flow calibration method is always the most basic and the most important calibration method. This was achieved on the basis of abundant experimental data. Therefore, this chapter mainly gives a brief introduction to the laboratory and field flow calibration methods, types and various types of flow standard devices and flow value transfer systems. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to check flow meter calibration'

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