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https://nwzimg.wezhan.cn/contents/sitefiles2057/10285453/images/42940580.png The case study in this issue comes from a chemical manufacturing enterprise in Jiangsu, which mainly produces and transports hazardous chemicals such as phosphorus trichloride, yellow phosphorus, phosphorus pentoxide, and liquid chlorine. These products are used to produce hot acids and phosphates, which are utilized in industries such as fertilizers, food, pharmaceuticals, pesticides, and electronics. Following the major explosion accident in Jiangsu Province in 2019, various organizations across the province have set higher standards for the storage and monitoring of hazardous materials. Challenges in radar measurement of liquid chlorine: Due to its strong oxidizing properties, volatility, and high toxicity as well as flammability, liquid chlorine is usually stored under high pressure and low temperature conditions. Therefore, when selecting level measurement instruments, it is necessary to take into account the requirements imposed by high temperature and low pressure; conventional double-flange and submersible level gauges are not suitable for this purpose. Even with fixed-type external level gauges in place, the company still needs another set of level gauges that use a different measurement principle for monitoring levels. Due to the high corrosiveness of the medium, contactless radar level gauges are one of the few instruments that can be used for such measurements with satisfactory results. https://nwzimg.wezhan.cn/contents/sitefiles2057/10285453/images/42940576.png But as a polar molecule, liquid chlorine has a low dielectric constant, around 1.5 (under standard atmospheric pressure and room temperature). Conventional 26G radars do not yield good measurement results, often experiencing signal loss and other issues, whereas 80G frequency-modulated radars can capture signals more accurately, enabling continuous and stable measurements. The effect of dielectric constant on radar measurements: The principle of radar level gauges involves a process of electromagnetic wave transmission, reflection, and reception. In this process, the reflectivity of electromagnetic waves is inversely proportional to the square root of the dielectric constant. The higher the dielectric constant, the greater the reflectivity; consequently, the reflected echoes become stronger, while the penetration of the waves becomes weaker ； The lower the dielectric constant, the lower the reflectivity; the weaker the echo resulting from the reflection of electromagnetic waves, and the greater their ability to penetrate. Dinghua’s solutions: Conventional 26G radar systems do not perform well when used to measure materials with low dielectric constants, as signal loss often occurs. The Dinghua G80 frequency-modulated radar has a minimum transmission angle of 3 degrees, which allows for concentrated transmission of energy; as a result, the echo signals are stronger. Combined with Dinghua’s unique “ELL signal analysis technology” and “small blind zone” technology, it is possible to effectively eliminate or reduce the impact of interference signals such as multiple echoes and false echoes, thereby ensuring high stability. https://nwzimg.wezhan.cn/contents/sitefiles2057/10285453/images/42940577.png△ Comparison curve between the radar level gauge used on chlorine storage tanks and external level gauges. This radar model features an aluminum alloy double-chamber housing, which ensures corrosion resistance in a chlorine-rich environment as well as explosion protection for the instrument, thus meeting all safety requirements. To date, this series of radars has been operating stably in various fields. Difficulties in radar measurement of yellow phosphorus. The main uses of yellow phosphorus are to produce hot acids and phosphates, which are used in the fertilizer, food, pharmaceutical, pesticide, and electronics industries. Due to the highly reactive chemical properties of yellow phosphorus, yellow phosphorus storage tanks are classified as high-hazard source areas; therefore, 3 sets of level monitoring instruments should be installed on each tank, with the signals from 2 sets fed into the SIS system and those from 1 set fed into the DCS system. Dinghua Electronics’ 80G radar level gauge is installed on the yellow phosphorus storage tank and used as part of a series of interlocked instruments integrated into the SIS system. SIS Safety Instrumented System: Abbreviated as SIS, it is also known as a safety interlock system. It serves as the part of a factory control system that handles alarms and interlocks, initiating alarm responses, making adjustments, or shutting down operations based on the results detected by the control system. It is an important component in the automatic control systems of industrial facilities. Thanks to the strong signal of the Dinghua G80 frequency-modulated radar, it is able to receive the reflected electromagnetic waves despite the influence of lower dielectric constants, thereby enabling accurate measurement of the liquid level in yellow phosphorus storage tanks. Additionally, this radar is easy to operate and maintain. It features fault alarm and self-diagnosis functions; users can analyze faults based on the error codes displayed by the operation display module, identify the issues promptly and resolve them, thereby making maintenance and correction more convenient and accurate and ensuring the stable operation of the SIS system. Quality first, service supreme – Dinghua Electronics always puts customer needs at the core. For complex conditions such as crystallization, steam generation, and mixing, as well as with special media involved, the company assigns dedicated radar technology engineers to conduct on-site inspections and provide appropriate solutions. In addition, Dinghua Electronics has a service network across the country that enables rapid response; regional managers are available to offer customers service and technical support right away. ▽Learn more about the features of the Dinghua G80. Case studies of the DHE radar series | The Dinghua G80 frequency-modulated radar level gauge has been successfully used in the pharmaceutical industry for handling challenging conditions involving mixing and foaming! Case Study | Successful Application of DHE Radar Level Gauge in Liquefied Gas Horizontal Tanks Case Study | Successful Use of Dinghua Electronics Radar Level Gauge in High-Viscosity Heavy Oil Storage Tanks Case Study | Successful Application of DHE Radar Level Gauge in Heavy Water Tanks