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technical article
Radar level gauge antenna parallel to the wall of the measuring slot facilitates microwave propagation
2012-4-24 8:32:34

在胜利炼油厂项目中应用55台。 55 radar level gauges produced by Jiangsu Dongxiang Instrument were used in the Shengli Refinery project.

Measuring range: 35 meters, 70 meters, 100 meters, 120 meters, 150 meters

Process connection: flange

Medium temperature: -40-250 ° C

Process pressure: -1.0-40bar

Repeatability: ± 1mm

Accuracy: <0.1%

Frequency range: 6.8GHz

Explosion / Protection Level: Exia ⅡCT6 / IP67

Signal output: 4 ~ 20mA / HART (two wires)

运用在冶金行业:冶金行业的工况相当复杂,各个工序的对于物位测量的要求均不相同:同时测量介质的性质;测量介质的温度、压力;防爆、防护等级;测量环境有无粉尘、蒸汽和泡沫;容器罐、池、料仓、料库的几何尺寸及安装位置都会对所使用的仪表有不同要求。 Radar level gauges are used in the metallurgical industry: The working conditions of the metallurgical industry are quite complicated, and the requirements for level measurement in different processes are different: the properties of the medium are measured simultaneously; the temperature and pressure of the medium are measured; the explosion-proof and protection level; The presence or absence of dust, steam, and foam; the geometric dimensions and installation positions of containers, tanks, silos, and silos will have different requirements for the instruments used. Therefore, the instrument must be carefully and thoroughly understood and analyzed before the selection of the instrument. If necessary, the site must be inspected on site to ensure the best results. When choosing radar level timing, we must first consider the difference in antenna material and frequency. Its frequency mainly has two kinds of 6GHz and 26GHz; But the 6GHz radar level meter is already a phase-out product, and the 26GHz high-frequency radar level meter should be used when possible. There are many types of antennas for the 26GHz high-frequency radar level meter, each with its own characteristics: The antenna of the LM-RD-55 high-frequency radar level meter is an all-tetrafluoro (PTFE) sealed antenna, which is suitable for good working conditions (short ranging) , Liquid level is stable) liquid, corrosive liquid. A small amount of volatiles causes only slight pollution to the antenna. The LM-RD-55 high-frequency radar level gauge generally used in water treatment workshops is installed on the intermediate water tank in the circulating water process. Because there is more foam in the water tank, most of them are installed outdoors in the open air. The antenna of the high-frequency radar level meter is divided into the following different types: 1. Stainless steel horn antenna, suitable for clean conditions without volatile matter. 2. Stainless steel horn with PTFE cover antenna, suitable for working conditions with volatile matter and dust. 3. Full antenna with PTFE cover antenna, suitable for working conditions with volatiles, dust and condensation. 4. Stainless steel horn with sweep antenna, compressed air is used to sweep the wind, which is suitable for working conditions with severe pollution to the antenna. 5. With antenna extension tube and heat pipe, it can be used in ultra-high temperature conditions (such as molten steel). It is more suitable for metallurgical industry converter and blast furnace loading bins and raw material bins. If the site conditions are relatively large and moisture exists in the ore powder, use LM-RD-58 / 59 high-frequency radar level gauges when possible.

安装注意事项 Installation precautions for radar level gauge

The antenna is parallel to the wall of the measuring slot, which is good for microwave propagation.

The distance between the installation position and the groove wall should be greater than 30cm, so as to avoid false signals on the groove wall from being mistakenly echo signals.

Try to avoid interference sources such as the cutting area and agitator, so that there are no fixed objects in the beam range, and improve the reliability of the signal.

The diameter of the tube should be less than or equal to the length of the shield tube (100mm or 250mm).