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1. There should be a 250 mm straight pipe section at the outlet, and at the inlet of the metal tube float flow meter, there should be a straight pipe section with a length of at least 5 times the pipe diameter. To ensure the accuracy of instrument measurements ； 2. The fluid flows through the flow meter from bottom to top; metal rotor flow meters must be installed vertically. Moreover, the verticality is better than 2°, and the horizontal angle in horizontal installation is also better than 2°, so as to ensure that production is not affected during fault handling or cleaning ； Metal tube float flow meters installed on process pipelines should be equipped with bypasses. 3. If the medium contains solid impurities and ferromagnetic materials, it is advisable to install a filter between the valve and the straight pipe section ； 4. Insulation protection measures are required when the temperature of the medium being measured is above 220°C, or when the fluid temperature is too low and crystallization is likely to occur. A jacketed type should be selected to enable cooling or heat retention ； 5. For instruments used to measure gas, it is necessary to ensure that the pipeline pressure is at least 5 times the pressure loss of the flow meter, so as to allow the float to function stably. If the gas calibrated at a specific pressure is released directly into the atmosphere at the outlet of the instrument. A pressure drop will occur at the float, causing data distortion. Under such operating conditions, a valve should be installed at the outlet of the instrument ； 6. This product generally requires no maintenance once the device is operating normally. Failures often occur right when the device is started, as the pipes are not cleaned thoroughly and the float gets stuck by solid particles; in such cases, the pointer of the indicator stays fixed in one position. At this point, the valves on both sides of the flow meter should be closed first, then the upper flange should be removed, the float taken out for cleaning, and finally reinstalled. Be careful to tighten the upper flange nuts evenly, and use washers properly.