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I. Regarding vibration Slight vibration in metal tube float flow meters is usually caused by fluctuations in the medium; this can be addressed by increasing damping； Moderate vibration is usually caused by the flow conditions of the medium; in the case of gases, it is often due to unstable operating pressure of the medium. Pressure stabilization or flow regulation devices can be used to overcome this issue or increase the damping of the instrument air ； Severe shaking is mainly caused by medium pulsations, unstable air pressure, or discrepancies between the pressure, temperature, and flow rates specified by the user for gas operation and the actual conditions indicated by the instrument, such that these differences are large enough to cause the instrument to exceed its range. II. The pointer stops moving at a certain position. The main reason is that the float is stuck. Generally, this occurs because the valve is opened too quickly when using the gauge, causing the float to rush upward toward the stopper; this results in the stopper deforming and trapping the float in place. However, it is also possible that the float gets stuck due to the float guide rod and the stop ring not being aligned. During handling, the gauge can be removed; the deformed stopper should be taken off and reshaped, and it should be checked whether it is concentric with the guide rod. If not, correction can be made. After that, the float should be reinstalled, and the float should be pushed by hand to ensure that it moves up and down smoothly without any obstruction. Additionally, when installing a metal tube float flow meter, it must be installed vertically or horizontally – it cannot be tilted, as this can also lead to obstruction of the meter and cause measurement errors. III. Large measurement errors One reason is that the installation does not meet the requirements. Installation requirements: For vertically installed instruments, they must remain vertical, with an inclination angle of no more than 2° ； For horizontally installed instruments, they must remain level, with an inclination of no more than 2° ； There must be no ferromagnetic objects within 100 mm around the instrument ； The installation location should be far away from valve diameter changes, pump outlets, and bends in the process pipelines. The requirement of a 5D front section and a 250 mm straight pipe section at the back must be maintained. Secondly, it is due to the large variations in the density of the liquid medium, which is also a cause of significant errors. Since, before calibration, the medium is converted to a density specified by the user in order to calibrate it using the flow rate of water under standard conditions, any significant change in the medium’s density can cause substantial errors in the measurements. The solution is to substitute the altered medium density into the formula to calculate an error correction factor, and then multiply the flow rate measured by the flow meter by this factor to obtain the actual flow rate. Thirdly, since gas media are greatly affected by temperature and pressure, it is recommended to use temperature and pressure compensation to obtain the true flow rate. Fourth, due to factors such as long-term use and pipeline vibration, moving parts of the instrument such as the sensing magnet, pointer, counterweight, and rotating magnet become loose, resulting in significant errors. Solution: You can first verify by manually pushing the pointer. First, place the pointer at the RP position and check whether the output is 4 mA and whether the flow display shows 0%. Then verify it step by step along the scale. If any discrepancies are found, the position of the component can be adjusted. It is generally required that professionals make adjustments; otherwise, the position will be lost and it will be necessary to return to the manufacturer for correction. IV. No current output First, check whether the wiring is correct ； Next, check whether the LCD is displaying; if it is displaying but there is no output, it is usually due to a damaged output transistor, and the circuit board needs to be replaced. V. No on-site indication First, check whether the wiring of the metal tube float flow meter is correct. Next, check whether the power supply is correct. Finally, reinstall the liquid crystal module and check for poor contact. For more information, please visit the company’s official website at http://www.yb1518.com/. Please retain this link when reproducing the content! http://www.yb1518.com/UploadFiles/2015113152723891.jpg