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The four key parameters in industry are temperature, pressure, flow rate, and level. A level gauge is a type of level measuring instrument, whose primary function is to measure the height of liquid media in a container. The main types of level gauges available on the market today include fork-vibration type, magnetic floating type, pressure type, ultrasonic type, sonar wave type, magnetic flap type, radar type, and so on. In use, magnetic flap level gauges are also widely employed. The biggest difference between it and Dinghua Electronics’ sonar-type external level gauge is contact-based versus non-contact measurement. The magnetic flap level gauge is a contact-type measuring device; when using it, the nature of the medium being measured must be taken into account. Its installation usually involves flange connection, which requires drilling holes, making it rather complicated. Its greatest advantage is that it is intuitive to look at. However, the weaknesses of magnetic flap level gauges are also evident, mainly including: large measurement errors, clogging of the float and inflexible flaps, demagnetization at high temperatures, and an inability to ensure the instrument’s lifespan. Dinghua Electronics’ sonar-based external level gauges offer non-contact measurement, are easy to install, and provide accurate level readings. Thanks to the automatic calibration function developed by Dinghua, these gauges can be calibrated in real time, creating a closed-loop system for level measurement and calibration that helps maintain the accuracy of the measurements. In addition, the ELL external level gauge is also reliable and durable; its sensing head and gauge contain no mechanical moving parts, and they are tightly sealed to isolate them from the outside environment, preventing wear or corrosion. In other words, agile, convenient, economical, and high-precision.