Recognition and Error Resolution of Rotameter Meters

Abstract: The information on the understanding and error solution of the rotor flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. A flowmeter is an instrument used to measure linear, nonlinear, mass or volume flow of liquids or gases. The foundation of good flowmeter selection is a clear understanding of the specific application requirements. Therefore, take the time to fully evaluate the properties of the process fluid and the overall installation. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the understanding of the rotor flowmeter meter and the details of the error solution article. A flow meter is an instrument used to measure linear, nonlinear, mass or volume flow of liquids or gases. The foundation of good flowmeter selection is a clear understanding of the specific application requirements. Therefore, take the time to fully evaluate the properties of the process fluid and the overall installation. When selecting a flowmeter, intangible factors such as familiarity of personnel on a particular plant site, their experience with calibration and repair, availability of spare parts, and mean time between failures should be considered. It is recommended that the installation cost calculation be performed after these steps have been taken. One of the most common flow measurement mistakes is to reverse the order of these steps: instead of choosing a sensor that works, try to justify using a cheaper product. Those low-cost purchases may become problems that are prone to occur in the most expensive facilities: 1. The measurement error of the rotameter is large: 1. Because the gas medium is greatly affected by temperature and pressure, it is recommended to use temperature and pressure compensation to obtain the real flow. 2. Due to many factors such as long-term use and pipeline vibration, the moving parts such as the sensing magnet, pointer, counterweight, rotating magnet, etc. of the float flowmeter are loose, resulting in large errors. Solution: You can first verify by pushing the pointer by hand. First, press the pointer at the RP position to see if the output is 4mA and whether the flow rate is 0%, and then verify according to the scale. If discrepancies are found, the parts can be repositioned. Generally, professionals are required to adjust, otherwise the position will be lost, and it needs to be returned to the manufacturer for correction. 3. The installation does not meet the requirements: for the vertical installation of the rotameter, the inclination angle should be kept vertical, and the inclination angle should not be greater than 20 degrees; for the horizontal installation of the rotameter, the inclination should be kept horizontal, and the inclination angle should not exceed 20 degrees; there should be no ferromagnetic objects in the 100mm space around the rotameter. . The installation position should be far away from the valve reducing port, pump outlet, turning port of process pipeline, etc. It is necessary to maintain the requirement of 250mm straight pipe section before and after 5D. 4. The large density change of the liquid medium is also a reason for the large error. Before the instrument is calibrated, it converts the medium according to the density given by the user, and converts it to the flow rate of water in the calibration state for calibration. Therefore, if the density of the medium changes greatly, it will cause a great error in the measurement. The solution is to bring the changed medium density into the formula, convert it into an error correction coefficient, and then multiply the flow measured by the flowmeter by the coefficient to convert it into the real flow. 2. Rotameter pointer shaking: 1. Severe pointer shaking: mainly due to medium pulsation, unstable air pressure, or the pressure, temperature, and flow rate of the gas operating state given by the user do not match the actual state of the rotameter, which is caused by large differences Rotameter overrange. 2. Slight pointer jitter: generally caused by medium fluctuations. It can be overcome by increasing damping. 3. Moderate pointer jitter: generally caused by the flow of the medium. For gas, it is generally caused by the unstable operating pressure of the medium. The gas damping of the rotameter can be overcome or increased by using a voltage stabilizer or a steady flow device. 3. The pointer of the rotameter stops at a certain position: the main reason is that the rotor of the rotameter is stuck. Generally, when the rotor flowmeter is used, the valve is opened too fast, so that the rotor quickly impacts the stopper, causing the stopper to deform and the rotor to be stuck. However, it is not excluded that the rotor is stuck due to the misalignment of the rotor guide rod and the stop ring. When handling, remove the meter, remove the deformed stopper and reshape it, and check whether it is concentric with the guide rod. If it is not concentric, it can be corrected, then install the rotor, push the rotor by hand, and feel that the rotor is unobstructed up and down. Yes, in addition, when installing the rotameter, it must be installed vertically or horizontally, and cannot be tilted, otherwise it will easily cause the meter to be stuck and bring errors to the measurement. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Understanding and Error Resolution of Rotameter Meters'

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