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In industrial plants, external ultrasonic level gauges and ultrasonic level meters are often used to measure the liquid level in storage tanks and reaction vessels, thanks to the following advantages. 1. It is easy to install; no holes need to be made in the top of the tank, and there is no need to drain the liquid inside the tank, which eliminates the complicated process involved in installing it over flammable liquids. Contactless measurement. It can be measured without coming into contact with liquids. Neither the density nor the viscosity of the liquid affects the measurement. Among the numerous storage tanks in chemical enterprises we have worked with, due to a lack of comprehensive understanding of ultrasonic level gauges, several common mistakes were made during their use. 1. Only explosion protection is considered, while corrosion resistance requirements are ignored. When selecting ultrasonic level gauges, chemical companies generally take into account explosion protection needs, as most of the liquids involved are flammable and explosive. It is common to consider the use of preservatives only in liquids such as hydrochloric acid, sulfuric acid, and hydrofluoric acid. In fact, when measuring organic solvents such as toluene, xylene, alcohol, and propanol, corrosion prevention also needs to be taken into account, as most organic solvents can dissolve ordinary plastic materials. We saw dissolved probes at several chemical plant sites, just like glue. External ultrasonic level gauges can be used in the most demanding environments: they can measure liquids at any pressure. Can measure highly toxic liquids. It can measure the most corrosive liquids. Measurable requirements apply to liquids that are sterile or of high purity. It can measure flammable, explosive, leak-prone, and polluting liquids. 2 Use an ultrasonic level gauge for highly volatile liquids. In chemical storage tanks, many are organic solvents, such as toluene, xylene, alcohol, propylene, etc. Most organic solvents have high volatility. Ultrasonic level gauges are an ideal measuring tool for corrosive, sludgy, or acid-base containing wastewater. The media that can be measured by ultrasonic level gauges include industrial chemicals such as hydrochloric acid, sulfuric acid, hydroxides, wastewater, resins, paraffin, sludge, alkali solutions, and bleaches. They are widely used in industries such as water treatment, chemicals, power generation, metallurgy, petroleum, and semiconductors. External ultrasonic level gauges can be used in the most demanding environments: they can measure liquids at any pressure. Can measure highly toxic liquids. It can measure the most corrosive liquids. Measurable requirements apply to liquids that are sterile or of high purity. It can measure flammable, explosive, leak-prone, and polluting liquids. 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, making it very safe. Even when the instrument is damaged or under maintenance, there is absolutely no possibility of leakage. Environmental protection: When measuring toxic, harmful, corrosive, pressurized, flammable, explosive, volatile, or leak-prone liquids, since the measurement probes and instruments are located outside the container, installation, repair, and maintenance can be carried out without any contact with the liquids and gases inside the tank. This makes it very safe and prevents environmental pollution; it is thus a green, environmentally friendly instrument.