The method of improving the turndown ratio and ensuring the measurement accuracy of the orifice flow meter

Abstract: The information on the method of improving the turndown ratio and ensuring the measurement accuracy of the orifice flowmeter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. With the development of microelectronics technology and sensor technology and the penetration of computer technology into instruments, the orifice flow measurement technology has made a leap, and its remarkable sign is that the accuracy of the differential pressure transmitter is greatly improved, from the previous 1..5 The level has been increased to the current level of 0..1. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the method of improving the turndown ratio of the orifice flowmeter to ensure the measurement accuracy. With the development of microelectronics technology and sensor technology and the penetration of computer technology into instruments, the orifice flow measurement technology has made a leap, and its remarkable sign is that the accuracy of the differential pressure transmitter is greatly improved, from the previous 1..5 The level has been raised to the current level of 0..1 or even 0..075; when the relative flow rate is lower than 30%, the differential pressure signal sent by the throttling device can also reach the measurement accuracy, which is beneficial to the expansion of the flow measurement range ratio. The second is the realization of intelligent flow measurement secondary instrument, not only the data processing capability and accuracy have been greatly improved, but more importantly, the non-linearity and scalability of the outflow coefficient that affects the range ratio expansion of the orifice throttling differential pressure flowmeter. The influence of the expansion coefficient is compensated, which creates sufficient conditions for the improvement of the measurement accuracy of the orifice flowmeter, so that the measured turndown ratio can reach 10..1. There are several measures that can improve the range ratio of the orifice flowmeter at this stage: 1. When the outflow coefficient C changes, the flow calculation formula needs to be corrected Flow totalizer. To achieve a wide range, it is necessary to modify the flow calculation formula due to the change of the outflow coefficient C. The modification method is to multiply the flow rate Q in the flow calculation formula by the correction coefficient K. 2. When the density.. is changed, the flow calculation formula needs to be corrected. When the density.. of the actual fluid is inconsistent with the design used, the change of.. will change the flow value Q, so the Q value should be multiplied by the correction coefficient K. .. is corrected. When the measured fluid is gas or steam, the correction of density .. is extremely important. K .. = ../..d where K .. is the density correction coefficient; .. is the density of the medium in the working state; ..d is the density of the medium in the design state (constant). .. can be found in the parameter table according to the actual temperature and pressure, or calculated according to the functional relationship (theoretical or empirical) of .. and temperature, pressure, relative humidity and other parameters. In the intelligent flow totalizer, the density table of water vapor has been loaded into the memory, and the value of .. can be accurately obtained by looking up the table. At present, intelligent flow totalizers such as WP series instruments of Shangrun Group have high-speed, high-precision computing functions and relatively large storage space, and can complete real-time compensation calculations for these complex intermediate parameters. 3. When the swellability coefficient.. is changed, the flow calculation formula needs to be corrected. When the actual fluid swellability coefficient.. is inconsistent with the one used in the design, the change of .. will change the flow value Q, so the Q value should be changed. It is corrected by multiplying it by the correction coefficient K c . K c = ../..d ( 5) In the formula, .. can be calculated from the formula (3); ..d is the expansion coefficient of the gas stream in the design state. In the specific operation, fill in .., ..P, P1 into the menu, and write them into the memory of the intelligent flow totalizer through the operation of the panel. . 4. Three expansion methods The following three methods can be used for expansion in the case of large turndown ratio. (1) Combine the large-flow segmented multi-channel parallel combination for measurement. In the occasions where the flow range changes greatly, the parallel combination of metering pipes of different pipe diameters is often used, and the change of the flow rate is adapted to the combination of the metering pipes. ( 2 ) Replace the orifice plate for measurement. Without changing the differential pressure flowmeter, the flow measurement can be achieved by changing the orifice plate with different opening diameters and changing the aperture ratio. This method is suitable for the situation that the seasonal flow rate changes greatly for a long time or the sudden change of the gas supply causes the differential pressure flowmeter to exceed the specified range of use. (3) Use an orifice flowmeter in parallel with differential pressure flowmeters of different ranges to measure. Using the primary device of the same orifice flowmeter, two or more differential pressure gauges with different ranges are connected in parallel for switching measurement. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Methods of orifice flow meter to improve turndown ratio to ensure measurement accuracy'

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