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External-mounted ultrasonic level gauges belong to the category of level measurement instruments; they offer advantages such as simplicity and cost-effectiveness, as well as easy device maintenance. They are widely used in industries and fields such as petroleum, mining, power plants, chemical plants, water treatment plants, sewage treatment stations, agricultural water use, environmental monitoring, and food processing for level measurement purposes. In this application, the external-mounted ultrasonic level gauge we have developed consists of two components: the gauge body and the ultrasonic probe; therefore, during installation, these two components must be installed separately. Regarding the surface-mounted level gauge, here are the installation details and precautions for surface-mounted ultrasonic level gauges: 1. Installation of the gauge’s main unit: The base of the main unit has 4 holes, allowing it to be fixed in different positions using bolts. Users can decide based on the conditions at the task site. When installing the instrument main unit, it is recommended to use an instrument protection box in areas with relatively low temperatures, in order to prevent the instrument’s temperature from dropping too low. In areas with high temperatures, the instrument should be installed in a shaded area to avoid excessive internal temperature due to exposure to direct sunlight. The display screen of the instrument host must not be exposed to direct sunlight for long periods of time. II. Installation of the ultrasonic probe: 1. For metal containers, it is sufficient to apply grease to the working surface of the probe and attach it directly to the bottom of the container using a magnetic cup, as shown in Figure 5.2-A. If the container’s exterior is made of glass or another material, the probe can be secured to it with adhesive or fixed to the bottom of the container using a bracket. 2. The probe must be aligned in the same straight line as the interval being measured. There should be no obstructions such as coils directly above the probe. 3. It should be positioned away from the liquid inlet at the bottom of the tank, in order to prevent intense movement of the incoming liquid from affecting measurements. 4. It should also be placed away from the area below the liquid inlet at the top of the tank, so as to avoid fluctuations in the liquid level caused by the impact of the incoming liquid, which could affect measurements. 5. It should be located above the liquid outlet or waste discharge port, to prevent any accumulation of debris at the bottom of the tank from impacting measurements. If these conditions cannot be met, measures must be taken to ensure that the debris at the bottom of the tank is removed regularly. 6. When the level measurement device is installed using magnetic attachment or welding/adhesion, the nominal diameter of the mounting surface on the tank wall should be at least Ф80, with a nominal roughness of 1.7, and an inclination of less than 3° (except for bypass pipes).