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1. Check whether the power supply is connected correctly; if the connection is incorrect, make the necessary adjustments according to the operation manual. 2. Use a three-volt meter to measure the voltage between 24V and O/P; the voltage should be between 13V and 36V. If the voltage is not within this range, check whether there are any issues with the wiring or related equipment. 3. For item 2, it is necessary to first confirm that normal operation is achieved; thereafter, a milliampere meter should be connected in series with the 4–20 MA circuit to check whether the current value is normal. If the current value is not normal, a new unit should be replaced or the factory’s technical staff should be contacted. 4. When the float ball drops to the lowest position, if the flag plate does not return to its original position and cannot keep up with the speed at which the float ball descends, a device should be installed to reduce the speed of liquid level changes. 5. Use a voltmeter to check the voltage between IN and COM; it should be around 2.5V under normal conditions. If the voltage is too low, remove the EXC wire and check again. If the voltage returns to normal, it indicates that there is a problem with the magnetic module; if the voltage remains low, it means the signal converter is damaged. If the above symptoms are observed, the signal converter should be replaced according to the actual situation. 6. The magnetic field of the 360-degree rotatable float in the color chip is too strong; contact the factory to replace the float. 7. If the color chips on the flag plate do not flip or are disordered, it indicates that there are no magnetic materials present around and inside the main tube; after removing them, pass a magnet over them to restore uniformity in colors. 8. It is unclear how to connect the 2 wires of the float-type continuous level indicator signal converter to the indicator; please follow the operation manual by connecting the 24V terminal on the signal converter to the 24V terminal of the indicator, and connecting the O/P terminal of the signal converter to the AI terminal of the indicator. If it still does not function properly after power is applied, contact the factory. 9. If the proximity switch does not function, use a multimeter to check whether the switch operates properly. When the magnet is brought near, the contacts should conduct electricity and the resistance should be below 300 MΩ; once the magnet is removed, the switch should be in an open circuit state and the resistance should be above 10 MΩ. If these requirements are not met, a new proximity switch should be replaced.