Reasons and Solutions for Decreased Measurement Accuracy of Metal Tube Float Flow Meters

Abstract: The reasons and solutions for the reduction of the measurement accuracy of the metal tube float flow meter are provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Metal tube rotameter is widely used in daily flow measurement of various types. It has the advantages of simple structure, reliable operation, low pressure loss of measuring gas, wide application range, high precision, convenient installation, small maintenance, long life, high temperature and high pressure resistance. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the reasons for the reduction of the measurement accuracy of the metal tube float flowmeter and the solutions. Metal tube rotameters are widely used in daily flow measurement of various types. It has the characteristics of simple structure, reliable operation, low pressure loss of measuring gas, wide application range, high precision, convenient installation, low maintenance, long life, high temperature and high pressure resistance, strong sense of security, and concise reading, etc. The flow measurement of medium, corrosive medium and medium with small diameter and low flow velocity. The metal tube rotameter produced does not have high requirements for straight pipe sections, has a wide flow ratio (10:1), two-line large liquid crystal display; optional on-site instantaneous/cumulative flow display, with backlight uniaxial sensitive indication, non-volatile Contact magnetic coupling transmission; all metal structure of this flowmeter, suitable for high temperature, high pressure and strong corrosive media; can be used in flammable and explosive hazardous situations; optional two-wire, battery, AC power supply and other methods; multi-parameter calibration function ; Metal tube rotameter with data recovery, data backup and power-down protection. The measurement accuracy of the metal tube rotameter will decrease in the process of use. The main reasons are as follows. 1. It is caused by the deformation of the internal structure of the metal tube rotameter. It may be that the mechanical transmission parts such as pointer gears are stuck, and the float or lining of the PTFE material is deformed. In this case, only replacing the float and lining will solve the problem. In addition, because the medium is too viscous and sticks to the float and the inner wall, in addition to causing the error of the flowmeter, it will also cause the pointer movement of the metal tube float flowmeter to be poor. In this case, the original accuracy can be restored simply by removing the flowmeter and cleaning it. 2. The most likely reason is that a guide rod is installed in the middle of the metal tube rotameter, and the float can run up and down on the guide rod smoothly to reduce the beating of the float. If the valve is opened or closed quickly, it will cause cavitation or water hammer, which will cause the float to slam violently in the flowmeter, which will deform the float or bend the guide rod. Just do it slowly when opening and closing the valve to avoid such problems. 3. Because the medium is too viscous and sticks to the float and the inner wall, in addition to causing the error of the flowmeter, it will also cause the pointer of the metal tube float flowmeter to move poorly. In this case, the original accuracy can be restored simply by removing the flowmeter and cleaning it. Knowing the above reasons, then we can prescribe the right medicine and take corresponding measures to improve the measurement accuracy of the metal tube rotameter. The specific method is as follows: the metal tube rotameter must be installed vertically, the fluid flows through the flowmeter from bottom to top, and the verticality is better than 2°, the horizontal angle is better than 2 when installed horizontally°;·The metal tube rotameter installed on the process pipeline should be bypassed so that the production will not be affected when dealing with faults or purging;·There should be a straight pipe section with a length of more than 5 times the pipe diameter at the inlet of the metal tube rotameter, and a straight pipe section of 250mm at the outlet to ensure the measurement accuracy of the instrument;·If the medium contains ferromagnetic substances, a magnetic filter should be installed;·If the medium contains solid impurities, consider installing a filter between the valve and the straight pipe section;·When used for gas measurement, the pipeline pressure should be ensured not less than 5 times the pressure loss of the flowmeter, so that the float can work stably;·If the temperature of the measured medium is higher than 220°C or the temperature of the fluid is too low, crystallization is likely to occur, and when heat insulation protection measures are required, the jacket type should be used for cooling or heat preservation;·Pipe flanges, fasteners, gaskets and metal pipe rotameter flanges must have the same standard for the normal installation and operation of the instrument. The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Causes and Solutions for the Decreased Measurement Accuracy of Metal Tube Float Flow Meters'

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