There are a wide variety of flow meters on the market, and the range of use is also very common. The accuracy of the flowmeter was determined at the factory. However, in practical applications, we still have the performance of reducing accuracy, and the accuracy of each type of flow meter is not the same. So how can we deal with the reduction of the accuracy of the flowmeter? The following Xiao Bian will give you a detailed description of the measures to reduce the accuracy of the flow meter.
1, save installation
Save the accuracy of the installation of such instruments does not require fluid calibration, the factory test more than a "dry standard" method, the fundamental accuracy may be calculated out. The calculation is based on the “extra value†provided by the demander, and can take the initiative to make up for and compensate for the density of the medium. In this case, it is necessary to focus on whether the location of the meter device can meet the meter request, such as the straight pipe section. The length, if it can't reach the request, the calculation of its additional deviation should refer to the instrument's statement. If the density of the medium is calculated manually, when the actual condition of the fluid medium is different from the planned condition, the flow performance value is multiplied by a correction factor for individual gases. T, Z, and P are determined as the additional task conditions under planning. The medium temperature, the contraction coefficient, and the medium pressure; t, z, and p are the medium temperature, the contraction coefficient, and the medium pressure under realistic mission conditions. Obviously, the temperature and pressure of the fluid during the actual task are randomly changed. The artificial compensation of the ultrasonic flowmeter can only stop compensating for the uniform value, and the deviation is obvious. The better measure is to take the initiative to make up for it by the intelligent instrument. For illusion (or fantasy) gases, this offset accuracy is commensurately high, with an accuracy of ± 1% for mass flow or scale volume flow.
Save installation has certain requests for straight pipe sections, and additional deviations caused when they are not satisfied. There is a delineation of the installation of scale savings.
2, volumetric flowmeter
For the volumetric flowmeter under the premise of the actual task, the additional deviation caused by the fluid medium is influenced by the temperature and pressure of the fluid medium on the volume of the metering chamber. Under the condition of the known material of the cavity, the volume can be calculated and changed. The meter's reading is modified. The viscosity of the actual fluid may also have an impact on the meter reading, which should be based on the instrument's elucidation. The length of the straight section does not affect its accuracy, which is the strength of this kind of meter's bulging. This kind of instrument shows the volumetric flow of the fluid under the task conditions. The user needs the weekday to be the volume flow or the mass flow under the standard condition, and the fluid density must be stopped to compensate. Originally, the new type flowmeters used smart performance meters and stopped the active compensation of density.
3, electromagnetic flowmeter
The principle of the electromagnetic flowmeter is based on Faraday’s electromagnetic theorem. The sensor's pipe inner diameter (fluid area) has an effect on the measurement value. When the pressure and temperature of the fluid medium are different from the reference conditions, the difference in the smooth area forms the change of the meter reading. Come out, otherwise a certain deviation must occur. The meter has a lower request for the straight pipe section, and the pressure transmitter application should be mindful that there is no modification formula when the straight pipe section is lacking. The meter measures the volumetric flow under the task conditions. If the volume flow or the quality flow under the scale condition is required, the density must be stopped.
4 turbometer
This type of meter is sensitive to the premise of the site, and the user is best satisfied his request completely in order to maintain the factory accuracy. When the difference between the temperature and pressure of the fluid medium and the reference condition is relatively large, the volume change of the sensor housing can be calculated based on the material of the sensor and the temperature pressure plate, and the meter reading can be modified. When the difference between the viscosity of the fluid medium under the mission condition and the viscosity of the calibration fluid is greater, the viscosity modification curve supplied by the meter maker shall be used to stop modification. Turbine meters have certain requests for the length of the straight section of their high and low travel, and they should be satisfied with the idea, especially when the user requests high precision. The meter represents the volume flow under the premise of the medium task. If you want to know the scale volume flow or the quality flow, you must stop the density compensation. Turbine meters have a high measurement accuracy and are often used as gauges to calibrate mission instruments.
5, vortex flowmeter
Input-type hydrostatic level transmitter This type of meter is sensitive to the premise of the site, and the user is best satisfied his request completely in order to maintain the factory accuracy. When the temperature, pressure, and reference conditions of the fluid medium are greatly different, the volume change of the sensor housing can be calculated based on the material of the sensor and the temperature and pressure plate, and the meter reading can be modified. The vortex flowmeter has a higher request for the length of the upper, mean straight section and should be satisfied with the idea, especially when the user requests high precision. The meter represents the volume flow under the premise of the medium task. If you want to know the scale volume flow or the quality flow, you must stop the density compensation.
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