The application of a new type of external level transmitter in our company

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In the petrochemical industry, particularly in refineries, it is very important to monitor the liquid level in vaporization tanks. This is because most of the substances present in refineries are flammable and explosive, and vaporized liquids are especially dangerous. Especially during the hot summer months, rising temperatures increase the tendency for these liquids to vaporize, thereby increasing the pressure on the tanks and creating safety hazards for the facility. Furthermore, due to the special properties of liquefied gas media, it is difficult for ordinary level measurement instruments to provide accurate readings. Therefore, there is a need for a liquid level transmitter that is accurate in measurement, safe and reliable, and has a long service life to solve this problem. Our company originally had two 400-cubic-meter liquefied gas spherical tanks, equipped with magnetostrictive level gauges from the American company MTS Systems. This type of level gauge is developed based on the magnetostrictive principle, offering high accuracy in measuring liquefied gas. However, due to the product’s poor corrosion resistance, its service life in our applications is short. Moreover, as it is relatively expensive, we are also working to find a new type of level transmitter. The ELL external level gauge produced by Xi’an Dinghua Electronics Co., Ltd. operates on a principle different from that of various existing types of level gauges; it uses an external measurement technique based on the principle of micro-vibrations of liquids to determine the liquid level in a container. The greatest advantage of this level gauge is that it enables measurement outside the container, without the need to make holes in the storage tank, thus achieving true non-contact measurement. It fundamentally solves the problem of measuring the liquid level in storage tanks containing flammable, explosive, or highly corrosive substances. In June 2003, our company installed two new liquefied gas spheres with a capacity of 400 cubic meters each. After considering the previous use of magnetostrictive level gauges as well as the features of ELL external level gauges, and following thorough research and evaluation, we decided to opt for self-calibrating ELL external level gauges. So far, having withstood the tests of the four seasons—spring, summer, autumn, and winter—the performance has been excellent, with only a few instances of signal distortion due to poor vibration signals. It eliminates the concerns that arise when using this type of level gauge for the first time, providing an excellent solution for measuring our liquefied gas storage tanks. In addition to these two units, the two new propylene tanks as well as the existing two liquefied gas tanks now also use external level gauges. The company’s applications