Comparison between magnetic flap level gauge and external level gauge

The principle of the magnetic flap level gauge The magnetic flap level gauge is based on the principle of the connector and the magnetic coupling to realize the real-time measurement and display of the liquid level. When the measured liquid level in the container rises and falls, the magnetic float in the buoy also rises and falls, and the permanent magnet steel in the float drives the magnetic flap outside the buoy to turn 180° through magnetic coupling. The flipper is painted with different colors (usually red and white) on both sides to indicate the position of the liquid level. Generally, when the liquid level in the container rises, the flipper changes from white to red, and when the liquid level in the container drops, the flipper changes from white to red. The flap changes from red to white, and the red and white junction of the indicator is the actual height of the liquid level in the container. The advantages of the magnetic flap level gauge Generally speaking, the magnetic flap level gauge has the following characteristics and advantages: 1. The structure is simple, the reading is intuitive, the installation is convenient, the maintenance cost is low, and the cost performance is high. 2. It has good sealing and anti-vibration performance, high reliability, and can adapt to the operation under the condition of large fluctuation of liquid level. 3. The magnetic steel corrector is compact and easy to use, and can be adjusted at will on site. 4. By adding remote transmission unit components, it integrates on-site indication, remote transmission, and alarm control switch to realize automatic liquid level control and remote control. 5. It can be equipped with steam jacket, electric heating, heat preservation/heat insulation and frost protection additional devices, which can be applied to various complex working conditions. 6. Wide application range and various forms, suitable for liquid level measurement under various working conditions (such as high temperature, high pressure, corrosion). Disadvantages of the magnetic flap level gauge In addition to the above advantages, the magnetic flap level gauge also has the following shortcomings and deficiencies: 1. The accuracy is low, and the measurement accuracy is generally between ±5.0mm~±10mm. 2. There is a certain range limit, the large-scale magnetic flap level gauge is inconvenient to transport, and the installation volume is relatively large. 3. After long-term use of the magnetic flap liquid level gauge, if there is medium sediment in the body, it will affect the float moving up and down along the protective tube outside the waveguide. In order to avoid being stuck, it must be cleaned regularly. (Reminder: Before cleaning the magnetic flap level gauge, turn off the valve to remove the remaining substances in the cylinder. After cleaning, install it as it is, and the float should be turned upside down. The gasket should be replaced to prevent aging and leakage. Air, tighten the screw. The principle of the externally attached liquid level gauge The externally attached liquid level gauge is a new type of liquid level instrument that uses the principle of sonar distance measurement and adopts micro-vibration analysis technology to measure the liquid level from outside the container. Sonar Ranging principle: The sound wave is emitted by the liquid level probe adsorbed at the bottom of the storage tank, penetrates the tank wall and propagates in the liquid. When the sound wave reaches the liquid surface, it will be partially reflected to form an echo, and the echo signal will reach the bottom of the tank and pass through. Through the tank wall, it is received by the liquid level probe and transmitted to the main body of the liquid level gauge. According to the time difference between transmitting and receiving echoes, the liquid level height is calculated. , to achieve true isolation, high safety, suitable for all kinds of extremely harsh working conditions, dangerous environments, no wear, corrosion, etc., reliable and durable, and small maintenance workload. 2. No need to open holes on the container, solve the problem of online Installation and debugging problems, easy installation, simple implementation, very suitable for application in online renovation projects. 3. Automatic real-time online calibration, high measurement accuracy, reduce adjustment workload and reduce labor costs. 4. Wide measurement range, up to 30m ; High measurement accuracy, up to ±0.1%. 5. It is suitable for continuous measurement of the liquid level of oil tankers and chemical liquid transportation vehicles, and does not need to be modified. Slurry, emulsion, suspension and other media can not be used for serious sedimentation and crystallization liquids. 2. The dynamic viscosity of the medium cannot exceed 30mPa s, and the medium temperature cannot exceed -40~220℃. 3. There is a 300mm bottom of the container Blind area. 4. When the container wall is made of multi-layer materials, the layers should be in close contact without bubbles or gas interlayers. The inner and outer walls of the container should be flat, and the arc should not be too large. Because of its characteristics of online installation and debugging, no need to open holes on the container, and complete isolation from the medium, the externally mounted liquid level gauge is widely used, especially in flammable, explosive, highly toxic and corrosive environments. The advantages are particularly prominent in occasions such as viscous, high pressure, aseptic, etc. With the increasing awareness of environmental protection and the increasing emphasis on personal safety, in the contemporary era of rapid economic development, this non-contact externally attached liquid level gauge With its advantages of high safety and low maintenance, it will be more and more popular and become the leader in the liquid level detection instrument family.

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