Selection and selection criteria of electromagnetic flowmeters

Abstract: The selection and selection standard information of electromagnetic flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. Accuracy level The accuracy level and maximum allowable error of the flowmeter within the specified flow range should meet the requirements of Table 1. Flowmeter error means using relative indication error. 2. Reference error is also used for the error of flowmeter for instantaneous flow indication. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the selection and selection criteria of electromagnetic flowmeters. 1. Accuracy grade The accuracy grade and maximum allowable error of the flowmeter within the specified flow range should meet the requirements of Table 1. Flowmeter error means using relative indication error. 2. Reference error For the flow meter error representation used for instantaneous flow indication, reference error can also be used, and the maximum allowable error series should comply with the provisions of Table 1. The accuracy level is no longer given in the bidding document of the verification result, but the maximum allowable error is used. The error is expressed, and FS should also be marked after the maximum allowable error, such as±0.5%FS. 3. Error representation method and selection principle In the one-time verification of a flowmeter, the flowmeter error representation method should be given according to one of the accuracy grade and reference error; for the combined representation of relative indication error and reference error For the flowmeter with error, one method should also be used to express its error in one verification. 4. Repeatability The repeatability of the flowmeter shall not exceed 1/3 of the absolute value of the maximum allowable error specified by the corresponding accuracy level. Instructions for selection of electromagnetic flowmeter: 1. Flow, according to the maximum flow to decide how much scale flow meter should be selected. 2. Determine the diameter of the flowmeter according to the flow rate and the size of the industrial pipeline. Generally, the flowmeter that is consistent with the pipeline is selected. 3. Select the lining of the flowmeter according to the characteristics of the measured medium. Such as temperature, corrosion, whether there may be negative pressure in the pipeline, etc. General linings are PTFE, soft rubber, hard rubber, PFA, ceramics and so on. 4. Select the material of the measuring electrode according to the characteristics of the medium. Generally, there are 304, 316, Hastelloy, titanium, tantalum and so on. 5. Select the pressure level of the flanges connected on both sides according to the pressure level of the process pipeline. 6. Select the protection level. If the sensor is completely underwater, you need to choose IP68. The above is the sensor part, and the transmitter part: 1. According to the requirements of the installation location, determine whether to choose an integrated type or a split type. 2. What type of output do you need, 4-20 mA signal, Hart, ProfibusPA, FF, etc. 3. Whether explosion-proof requirements are required. Determine the explosion-proof level. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Model Selection and Selection Criteria for Electromagnetic Flow Meters'

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