Steam flow meter coefficient correction

Abstract: The coefficient correction information of steam flow meter is provided to you by excellent flow meter and flow meter manufacturers. Coefficient correction of steam flowmeter: A method of calibrating the nonlinearity of the meter coefficient is proposed by the integrated intelligent two-wire vortex steam flowmeter. Its structure, correction operation and correction strategy are introduced, which can effectively improve the precision of the instrument. It has operations. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the steam flowmeter coefficient correction article. Coefficient correction of steam flowmeter: A method of calibrating the nonlinearity of the instrument coefficient is proposed by the integrated intelligent two-wire vortex steam flowmeter. Its structure, correction operation and correction strategy are introduced, which can effectively improve the precision of the instrument. It has the characteristics of easy operation, convenient debugging and general use. Key words instrument coefficient nonlinear correction steam flowmeter intelligent transmitter vortex flowmeter 0 Introduction Vortex flowmeter is simple in structure, stable in performance and small in pressure loss. Features such as wide measuring range are widely used in liquid measurement. The principle is that when the liquid passes through the vortex generator in the pipeline, the vibration frequency of the generated vortex is proportional to the flow rate. In the vortex steam flowmeter, piezoelectric crystals or differential capacitors are used as sensors to amplify, filter and drive the detected weak vibration signal, and then output a pulse signal whose frequency is proportional to the instantaneous volume flow. He type printed circuit board, commonly known as amplifying board. This transmitter is suitable for distributed mode, and each transmitter is equipped with a flow totalizer based on frequency detection. In recent years, many enterprises have gradually adopted the instrument distribution management mode, which requires the flow signals of multiple measurement points to be uniformly converted into 4-20mA, and then sent to the computer for centralized proximity and management. Therefore, the two-wire 4-20mA vortex steam has appeared. The flowmeter is formed by connecting a conversion board behind the original amplifying board. The conversion board is composed of f/V and V/I circuits, and converts the frequency signal output by the original amplifying board into 4-20mA output.'>Influence of nonlinearity of meter coefficient The nonlinearity of the sensor output signal is the most important factor restricting the improvement of the accuracy of the vortex steam flowmeter. The nonlinearity causes the meter coefficient K in each flow interval to be not constant. The meter factor is defined as the number of impulses that occur per cubic meter of flow. The nonlinear error of the transmitter is defined as (Kmax－Kmin)/ (Kmax＋Kmin)×100%. Usually, the nominal accuracy of a constant transmitter that outputs a pulse frequency signal can only reach 1-2 grades. For the vortex transmitter with current output, due to the addition of the f / V link in the circuit, although the f / V conversion circuit based on RC charge and discharge has a higher resolution, the linearity and stability cannot meet the higher requirements. Precision conversion requirements. 2. The mechanism and effect of correction Take a f500mm capacitive vortex flowmeter produced by Weihai Cyber ​​Instruments Co., Ltd. as an example. It can be seen from the data in Table 1 that the basic error of this watch is at most 0.82, which can only be rated as level 1. It is envisaged that if the instrument constant of 5 points can be corrected according to the error of the corresponding point, the accuracy of the instrument is expected to be improved. It should be noted that the improvement of the accuracy level of the instrument is based on the small repeatability error of the verification, and the good repeatability is the characteristic of the vortex flowmeter. Conversely, if the repeatability is not good, the nonlinear correction will be meaningless, and the effect of nonlinear correction is limited by the repetition error. The repetition error of the above-mentioned table is up to 0.266%. After nonlinear correction, the accuracy is expected to reach 0.5 level. There are many factors affecting the linearity, which may come from many aspects such as the material, structure, process and the quality of the amplifier circuit of the detection component. Among them, the intelligence of the transmitter itself, the integration of signal conversion and calibration are the shortcuts to improve its accuracy. 3 Intelligent two-wire 4-20mA vortex steam flowmeter 3.'>Structure block diagram The structure block diagram of the two-wire 4-20mA vortex steam flowmeter designed by the author is shown in Figure 1. Figure 1 Structure block diagram of two-wire 4-20mA vortex steam flowmeter The circuit structure of the original amplifying board is basically unchanged, only the micro-power consumption is improved. On this basis, a conversion board is added, and two circular plates are fixed on the cylindrical type of the transmitter On both sides of the metal shell, the signal and power lines are connected by connectors. The general two-wire system is adopted, and all components including the amplifier board are of micro-power consumption type to meet the requirement that the zero-point current does not exceed 4mA. The MCU adopts the 89C2051 of the MCS-51 series, and the two internal counters/timers T0 and T1 are set to count and work respectively to detect the pulse frequency from the amplifier board with high precision. The row D/AMAX504 controls the output current. The conversion accuracy of the two intermediate processes of frequency detection and D/A conversion is better than 0.1%.

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