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Spherical tanks are efficient and economical pressure vessels for storing and transporting various gases, liquids, and liquefied gases. In recent years, it has been widely used in industries such as chemicals, petroleum, refining, shipbuilding, and urban gas production. It is primarily used for storing liquefied gases such as liquefied petroleum gas, liquid ammonia, and VCM monomers. These substances are in gaseous state at normal temperature and pressure; to store them, they need to be converted into a liquid state by applying pressure and reducing temperature, which **improves storage efficiency**. In the level measurement of spherical tanks, horn-type radar level gauges may exhibit false readings due to the influence of dielectric constants. Vaporization and diffuse reflection from the liquid surface can cause the electromagnetic waves to be lost, further leading to inaccurate measurements or even the inability to take any readings. Guided-wave radar level gauges may face issues such as cable breakage as a result of fluctuations in the liquid flow. Servo level gauges require the installation of wave-stabilizing tubes inside the tank, which can lead to problems such as the float getting stuck or the wire breaking; as a result, maintenance is very difficult and costly. Ball tanks are generally filled with liquid gases, and the liquid level remains in a dynamic equilibrium between the liquid and gas phases; as a result, the high measurement accuracy of servo level gauges is not always evident when used for measuring the liquid level in such tanks. Thanks to its technical features, the sonar-type external level gauge enables non-contact measurement without the need for drilling holes, emptying the tank, or using fire. It is not affected by changes in the dielectric constant, fluctuations, pressure, temperature, density, etc., of the liquid inside the tank. Its unique \"micro-vibration analysis\" technology, \"self-calibrating accuracy\" technology, and \"small blind zone\" technology enable it to perform accurate level measurement in various liquid conditions reliably. A classic example of the application of sonar-type external level gauges in spherical tanks: A subsidiary company of a group in Shanxi Province is primarily engaged in the production of liquid ammonia, methanol, sulfur, etc. In April 2019, due to production requirements, it was necessary to install external level gauges on the liquid ammonia storage tanks. Liquid ammonia is widely used in industry. It is corrosive, volatile, flammable, and explosive, classified as a hazardous chemical, with a high incidence of chemical accidents. The company is undergoing technical upgrades and requires level gauges with high safety and stability. After research, it was found that Dinghua Electronics’ external level gauges come with a SIL3 certification, offering safety and explosion protection; moreover, they can be upgraded without the need for drilling, which is quite convenient. Since its installation and operation, the external level gauge has provided stable level readings without any malfunctions.