Yellow river water level measurement using ultrasonic level gauge
After a long period of analysis and comparison, a research group of Nanjing Hohai University finally selected the MiniMeTM ultrasonic liquid level transmitter from FLOWLINE Company in the United States for water level measurement in the Yellow River. The most important reasons for the selection of the MiniMeTM ultrasonic level gauge are as follows: 1. High cost performance: This ultrasonic level gauge has an accuracy of +/- 0.29, a resolution of 3mm, a blind zone of only 10cm-30cm, and reliability high. And the price is the lowest of all similar imported products. 2. The most characteristic is that other similar products cannot be compared with it: its beam width is only 5cm-7.6cm. The beam of a general ultrasonic level gauge is a cone of 8 ° -15 °. The final ray width of a measurement range of 10 meters must reach 1.4 meters to 2.68 meters, while the ray width of the MiniMe is only 7.6 cm or 0.076 meters. It has an incomparable advantage in the level measurement of the narrowest storage tanks or in the level measurement of rivers and lakes. Because in river and lake level measurement, a measurement well is generally built, and the beam width is small, which can greatly reduce the construction cost of the measurement well. 3. Its probe materials are PC / ABSFR and PVDF Kynar, which have high anti-corrosion performance. In addition, the seal of the shell is 50% IP67. The ability to adapt to the environment is particularly strong. 4. Built-in non-volatile memory, which can reliably store user's debugging data, and has high reliability. I will not repeat them below. In short, it is not surprising that the MiniMETM two-wire ultrasonic level gauge was selected as the measuring instrument for the Yellow River level. ，在我国的防洪防汛工作中的作用将会越来越重要！ With the wide application of river and lake level measuring instruments, we believe that this type of ultrasonic level gauge will play an increasingly important role in flood and flood prevention in China!
在水煤灰罐中的应用 Application of ultrasonic level gauge in coal water ash tank
Liquid level monitoring of a coal ash storage warehouse in Zhujing Town, Jinshan District. The tank for storing coal ash is 12 meters high. The coal ash is pumped in from the bottom by the pump without stirring. After installation by the customer, the meter display is abnormal. The actual liquid level of more than 1 meter will display more than 1 meter, and the other will display more than 10 meters. After my technicians arrived at the scene, they looked at the ultrasonic echo signals and found that there was an interference wave at a position more than one meter away from the tank mouth. After shielding the interference wave, the meter showed normal. Dongfang Yuhong Plant in Jinshan District, five 3.5-meter coal-water ash tanks. After the customer installed it, they found that the meter data of the coal-water tank next to the boiler room kept jumping back and forth. After my technicians arrived at the scene, they found that the scene environment was complicated and the interference was large. After the ground wire was independently grounded, the situation improved, but the instrument data was still unstable. After replacing the main unit of the meter and increasing the transmission power, the meter measures normally.