For a long time, a user of Vacorrda Automation has been planning a technical transformation project for buried storage tank level measurement and pump control technology. The customer wants to output three alarm switch signals through the liquid level sensor to control the start and stop of the three centrifugal pumps respectively, so as to avoid safety accidents caused by the damage of the centrifugal pump or the overflow of the fuel tank due to dry operation.Because the acidic medium is stored in the buried tank of our factory, there is steam in the tank body, the measured medium contains many impurities, and the liquid level fluctuates greatly. Therefore, such special working conditions also put forward higher requirements for the measuring instrument.Through the comparison of common liquid level measuring instruments such as ultrasonic level gauge, radar level gauge, float level gauge, magnetostrictive level gauge, and float level switch, it is found that they do not meet the requirements of on-site working conditions.Comparison of level meters1. The ultrasonic level gauge the ultrasonic level gauge emits mechanical waves, and the probe can send and receive signals. When there is steam in the use environment, it will interfere with the transmission and reflection of the signal, thereby affecting the accuracy of the measurement, so it is not recommended.2. Radar level gauge Radar level gauge emits electromagnetic waves, water vapor is easy to condense on the surface of the probe, which will also produce interference signals. Fluctuations in the liquid level will produce false echo emissions. However, some manufacturers can do echo suppression during signal reception, so false echoes can be overcome to a certain extent. However, the use of radar level gauges is unreliable in working conditions with high steam concentration and large liquid level fluctuations. In addition, the price of radar level gauges is relatively high.3. The float level gauge moves up and down on the connecting rod to trigger the pull-in of the reed switch in the connecting rod, and output different current values accordingly. However, because the tested solution contains impurities, it is easy to be blocked, which affects the normal floating of the float, thereby affecting its working reliability. Similarly, magnetostrictive level gauges have similar problems.4. The float level switch is a simple switch for civilian use. It is not recommended to use it in an environment with fluctuating liquid level and high acidity, especially large storage tanks, which generally cannot be installed and work unreliable. Why is the tuning fork level switch competent? Huikeda Tuning Fork Liquid Level Switch outputs a switching signal by detecting the frequency change of the vibration of the probe, which is completely unaffected by steam. By setting the detection delay, it is not disturbed by the fluctuation of the liquid level. The fork body and flange in contact with the liquid can be made of 316L stainless steel, and are designed with ECTFE and PFA coatings, which can be adapted to the measurement of strong acid and strong alkali liquids. The fork body has a strong anti-impurity suspension ability after precise tuning.Therefore, the sales engineer of Huikeda formulated the on-site installation solution of the tuning fork liquid level switch for the customer according to the customer’s needs and on-site working conditions. As shown in the figure above, on the top of the buried tank, three Huikeda tuning fork level switches are used for flange installation, and the distance between the alarm point and the flange surface (insertion depth) is 1500mm, 1000mm, and 500mm, respectively. Start and stop of the three pumps. After the user purchased it and put it into use, it fully demonstrated the advantages of Huikeda tuning fork liquid level switch, such as corrosion resistance, high measurement accuracy, strong anti-hanging ability when the measured solution contains impurities, and not being affected by stirring and medium flow, which are well resolved. To solve the user’s measurement problems, fully meet the requirements of complex working conditions. After six months of installation and use, the product works stably and reliably and is well received by users.
Huikeda tuning fork liquid level switch has a protection level of IP66/67, and has passed the dual explosion-proof certification of flameproof and intrinsic safety. Products are widely used in petrochemical, food, pharmaceutical, metallurgy, water treatment and other industries.
Post time: 21-09-21