The tuning fork level switch is a vibration type level switch, which works according to the vibration principle of the cantilever beam. The piezoelectric device is used to realize the vibration drive and detection of the fork body. When the fork body is in contact with the measured liquid, the resonance frequency of the fork body is significantly reduced, and the change of the vibration frequency directly responds to the output signal of the pressure detection device, and the detection circuit judges the change of the frequency and outputs the switch signal. As a control switch for high-reliability level measurement, tuning fork level switches have many advantages and classifications. This article takes the tuning fork switch as an example, and the introduction is as follows:1. Advantages of tuning fork switchThe tuning fork liquid level switch is a control switch for high-reliability liquid level measurement based on the design of detecting frequency changes. It has the following advantages:1. Patented products. Tuning fork liquid level switch is a product of national invention patent.2. The fork is short. The length of the tuning fork is only 40 mm, which is suitable for liquid level measurement in containers, water tanks, water tanks, and liquid level measurement in narrow spaces such as pipes.3. Low density of measuring medium. According to the design principle of detecting the change of the vibration frequency when the fork body penetrates the medium, the fork body is precisely adjusted, and the product can measure the density of the medium as low as 0.5g/cm.4. Strong resistance, not affected by foam, bubbles, viscosity, vibration and liquid characteristics.5. Multiple output methods. The three signal output modes of relay, two-wire system and Namur can meet the different conditions and needs of users.6. Obtain third-party certification. This case, through the explosion-proof certification, the protection level reaches IP66/IP67, and can be used for liquid level measurement under various complex working conditions.7. Wide application range. It is not only suitable for level measurement of hydrochloric acid, sulfuric acid, nitric acid, lye, syrup, chemical liquid, industrial wastewater, etc., but also for complex measurement of high-pressure liquefied gas, foam, foam, viscous liquid, vibration interference, etc. such as LNG.2. Classification of tuning fork switches
According to different standards, there are different classifications of tuning fork level switches. At present, tuning fork level switches are relatively common, including normal temperature tuning fork level switches, high temperature tuning fork level switches, food grade tuning fork level switches, high-voltage protection tuning fork level switches, and coated anticorrosive tuning fork level switches. 1. Normal temperature tuning fork level switch fork is only 40mm, can measure liquid density as low as 0.5g/cm, and process temperature is as high as 150. The main applications are as follows: (1) Determine the liquid level of petroleum, crude oil, gasoline, and lubricating oil storage tanks. (2) Pipeline level control of pump protection system. (3) Liquid level measurement of LNG delivery pipe (density 0.56g/cm). (4) Liquid level measurement of raw material storage tanks, tanks, and reaction parts (strongly corrosive, high-temperature liquids) in the production of chemical fragrances. 2, high temperature tuning fork level switch high temperature tuning fork level switch is designed to withstand high temperatures, the process temperature can reach up to 250C, and high reliability is a control switch used to measure the water level of high temperature media. Usually used for water level measurement and control when the process temperature exceeds 150. 3. Food grade tuning fork switch Food grade tuning fork switch uses fixture process connection, surface finish Ra
Post time: 21-09-21