What are the standard dimensions for flow meters before and after installation?

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What are the acceptance criteria for flow meters? The acceptance criteria for flow meters mainly include appearance, performance, stealth function, installation, and stability. 1. The appearance inspection of the instrument surface should be free of obvious scratches or cracks, and the model, specifications, and other information on the nameplate must be clear and accurate. The connection part needs to be firm, ensuring good sealing and no looseness or leakage. 2. The accuracy of performance indicators should meet the design requirements. By comparing with high-precision standard flow meters, the error should not exceed the specified range. For example, the error of 0.5 level accuracy should be within ± 0.5%. Repeatability requires consistent results from multiple measurements, with errors typically not exceeding one-third of the specified accuracy level. The range ratio needs to reach the specified value to ensure accurate measurement within a wide flow range. 3. The functions of each Zen rental item, such as cumulative flow display, signal output, and alarm, should work normally during functional testing. Intelligent flow meters also need to test their communication function to ensure normal data transmission with the upper computer or other devices. Installation and inspection should comply with the product manual and specifications, including the position, pipeline connection method, and length of the straight pipe section. For example, the length of the upstream straight pipe section should not be less than 10 times the pipe diameter, and the downstream should not be less than 5 times the pipe diameter. 5. Operational stability: Within the specified operating time, the flow meter should operate stably with no significant fluctuations in measurement values. Usually, continuous trial operation for more than 24 hours is conducted to observe the situation.

2. What is the accuracy level of the flowmeter?

1、 The accuracy of the first level standard instrument is: 0.00

5, 0.0

2, 0.05.

2、 The accuracy of secondary standard instruments is: 0.

1. 0.

2. 0.3

5. 0.5.

3、 The accuracy of general industrial instruments is:

1.

5. 2.

5. 4.0.

4、 The precision level of instruments used in scientific experiments is above 0.05.

5、 Electrical instruments are divided into seven levels: 0.1, 0.2, 0.5, 1.0, 1.5, 2.5, and 5.0. The accuracy level of a flowmeter is the maximum allowable error expressed as a percentage of the instrument, minus the percentage sign. The higher the accuracy, the lower the level, and the smaller the error. Calculation method: Relative percentage error=(measured value of northern parameter - standard value of northern parameter)/(upper limit value of ruler - lower limit value of ruler) * 100%. Extended data flow measurement is widely used in various fields such as industrial and agricultural production, national defense construction, scientific research, foreign trade, and peoples daily lives. In the production of the petroleum industry, flow measurement runs through the entire process from oil extraction, transportation, refining and processing to trade and sales. Any link cannot be separated from flow measurement, otherwise the normal production and trade exchanges of the petroleum industry cannot be guaranteed. In the chemical industry, inaccurate flow measurement can cause an imbalance in the distribution ratio of chemical c

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