Measures to ensure the measurement accuracy of the orifice flow meter

Abstract: The information on the measures to ensure the measurement accuracy of the orifice flowmeter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. When the orifice flowmeter is measured on site, the measurement results are often subject to large errors due to some objective factors. The following will mainly introduce the main measures to ensure the measurement accuracy of the orifice flowmeter: 1. Table calibration. big. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following are the details of the measures to ensure the measurement accuracy of the orifice flowmeter. When the orifice flowmeter is measured on site, the measurement results are often subject to large errors due to some objective factors. The following will mainly introduce the main measures to ensure the measurement accuracy of the orifice flowmeter: 1. Table calibration. As we all know, standard orifice plates can be used directly as long as they are designed and manufactured with reference to relevant standards and do not require real flow calibration. Because the outflow coefficient can be calculated directly by the software, the computer calculation is ideal after all, and it is still different from the on-site environment. Therefore, in order to ensure the measurement accuracy, it is recommended to perform real flow calibration for each flowmeter, and the calibrated outflow The coefficients are compared with the calculation results, and the difference is calculated and corrected. 2. Reynolds number correction. There is a definite relationship between the flow coefficient of the orifice flowmeter and the Reynolds number. When the mass flow changes, the Reynolds number changes in direct proportion, thus causing the flow coefficient to change. 3. The influence of temperature on the orifice flowmeter and its correction. The change of fluid temperature causes the change of density, which leads to the change of the relationship between differential pressure and flow rate. The correction of temperature change is to use a temperature instrument to measure the on-site temperature and then input it into the secondary instrument to correct the error caused by the temperature change. 4. Swellability correction. When the orifice flowmeter measures the flow of steam and gas, the expansion of the fluid must be corrected. For the specific correction coefficient, please refer to the design manual of the throttling device. 5. Calculation of steam mass flow, when the orifice flowmeter measures steam, the flow value is first obtained from the differential pressure signal, and then the density is obtained from the steam temperature and pressure values ​​to calculate the steam flow quality. In fact, the flow of orifice flowmeter is widely used by us, and it is also the representative of differential pressure flowmeters. You can promote other differential pressure flowmeters through appropriate inferences. When the orifice flowmeter is measured on site, the measurement results are often subject to large errors due to some objective factors. The following will mainly introduce the main measures to ensure the measurement accuracy of the orifice flowmeter: 1. Table calibration. As we all know, standard orifice plates can be used directly as long as they are designed and manufactured with reference to relevant standards and do not require real flow calibration. Because the outflow coefficient can be calculated directly by the software, the computer calculation is ideal after all, and it is still different from the on-site environment. Therefore, in order to ensure the measurement accuracy, it is recommended to perform real flow calibration for each flowmeter, and the calibrated outflow The coefficients are compared with the calculation results, and the difference is calculated and corrected. 2. Reynolds number correction. There is a definite relationship between the flow coefficient of the orifice flowmeter and the Reynolds number. When the mass flow changes, the Reynolds number changes in direct proportion, thus causing the flow coefficient to change. 3. The influence of temperature on the orifice flowmeter and its correction. The change of fluid temperature causes the change of density, which leads to the change of the relationship between differential pressure and flow rate. The correction of temperature change is to use a temperature instrument to measure the on-site temperature and then input it into the secondary instrument to correct the error caused by the temperature change. 4. Swellability correction. When the orifice flowmeter measures the flow of steam and gas, the expansion of the fluid must be corrected. For the specific correction coefficient, please refer to the design manual of the throttling device. 5. Calculation of steam mass flow, when the orifice flowmeter measures steam, the flow value is first obtained from the differential pressure signal, and then the density is obtained from the steam temperature and pressure values ​​to calculate the steam flow quality. In fact, the flow of orifice flowmeter is widely used by us, and it is also the representative of differential pressure flowmeters. You can promote other differential pressure flowmeters through appropriate inferences. When the orifice flowmeter is measured on site, the measurement results are often subject to large errors due to some objective factors. The following will mainly introduce the main measures to ensure the measurement accuracy of the orifice flowmeter: 1. Table calibration. As we all know, standard orifice plates can be used directly as long as they are designed and manufactured with reference to relevant standards and do not require real flow calibration. Because the outflow coefficient can be calculated directly by the software, the computer calculation is ideal after all, and it is still different from the field environment. Therefore, in order to ensure the measurement accuracy,It is recommended to perform real flow calibration for each flowmeter, compare the calibrated outflow coefficient with the calculation results, calculate the difference, and make corrections. 2. Reynolds number correction. There is a definite relationship between the flow coefficient of the orifice flowmeter and the Reynolds number. When the mass flow changes, the Reynolds number changes in direct proportion, thus causing the flow coefficient to change.

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