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An external level gauge is a device that uses the principle of vibration analysis to measure the liquid level of a medium inside a container from outside the container; it belongs to the category of level gauges that provide completely isolated measurement. Application range of external level gauges: Low-viscosity liquids: Attention should be paid to the dynamic viscosity of the liquid ； A large amount of solids, such as sediment, cannot be suspended in liquids ； Liquid temperature: -50°C to 250°C℃ ； Container material: Rigid material that can transmit vibrations effectively. Product features of external level gauges: Suitable for harsh environments: capable of measuring liquids at any pressure, those with high corrosivity, high toxicity, requiring absolute sterility, or having very high purity ； Safety: When measuring liquids that are toxic, corrosive, under pressure, flammable, explosive, volatile, or prone to leakage, since both the measuring probe and the instrument are located outside the container, there is no contact with the liquids and gases inside the tank during installation, repair, or maintenance. Moreover, the use of valves or connecting pipes is avoided, which makes it very safe. Even when the instrument is damaged or under maintenance, there is absolutely no possibility of leakage, explosion, or poisoning ； Environmentally friendly: it neither leaks liquids nor gases, and thus never pollutes the environment; it is a green, environmentally sustainable instrument ； It is the most convenient and cost-effective for installation and maintenance: no holes need to be made in the container, no flanges are required, and no connecting pipes are needed ； Durable and reliable: The measuring head and instrument contain no mechanical moving parts, and are tightly sealed to isolate them from the outside environment; as a result, they do not wear out or corrode, making them highly durable and reliable.