Types of level gauges | Types of level gauges

What are the types of liquid level gauges? What are the classifications of level gauges? Please see the following content First of all, the liquid level gauge is an instrument that measures the level of the medium in the container. The liquid level gauge is also called a liquid level gauge and a liquid level sensor (instrument). Different types of liquid level gauges are designed according to different principles, and different liquid level gauges have different application ranges. First, the magnetic float level gauge is developed according to the principle of buoyancy and magnetic coupling. When the liquid level in the measured container rises and falls, the magnetic float in the body tube of the liquid level gauge also rises and falls, and the permanent magnet in the float is transmitted to the magnetic flip column indicator through magnetic coupling, which drives the red and white flip columns to flip. When the liquid level rises, the flip column changes from white to red, and when the liquid level drops, the flip column changes from red to white. The red and white junction of the indicator is the actual height of the liquid level inside the container, so as to achieve a clear indication of the liquid level. It can achieve high sealing, anti-leakage and suitable for high temperature, high pressure and corrosion-resistant occasions. It is more superior to high temperature, high pressure, toxic, harmful and strong corrosive media. In direct contact with the medium, the floating ball sealing requirements are strict, and the viscous medium cannot be measured. Magnetic materials such as demagnetization can easily cause the level gauge to not work properly. Second, the magnetic flap (column) type level gauge is developed based on the principle of buoyancy and magnetic coupling. When the liquid level in the measured container rises and falls, the magnetic float in the body tube of the liquid level gauge also rises and falls, and the permanent magnet in the float is transmitted to the magnetic flip column indicator through magnetic coupling, which drives the red and white flip columns to flip. When the liquid level rises, the flip column changes from white to red, and when the liquid level drops, the flip column changes from red to white. The red and white junction of the indicator is the actual height of the liquid level inside the container, so as to achieve a clear indication of the liquid level. It can achieve high sealing, anti-leakage and suitable for high temperature, high pressure and corrosion-resistant occasions. It is more superior to high temperature, high pressure, toxic, harmful and strong corrosive media. In direct contact with the medium, the floating ball sealing requirements are strict, and the viscous medium cannot be measured. Magnetic materials such as demagnetization can easily cause the level gauge to not work properly, and the flap is easy to get stuck, resulting in the inability to transmit the indication remotely. Magnetic materials such as demagnetization can easily cause the level gauge to not work properly. Third, the radar level gauge electromagnetic wave radar level gauge (guided wave radar level gauge) radar level gauge adopts the working mode of transmitting-reflecting-receiving. The antenna of the radar level gauge emits electromagnetic waves. These waves are reflected by the surface of the liquid to be measured and then received by the antenna. The time from emission to reception of electromagnetic waves is proportional to the distance to the liquid surface. The relationship is as follows: D=CT/2 (D: The distance from the radar level gauge to the liquid level C: The speed of light T: The electromagnetic wave running time) The radar level gauge records the time elapsed by the pulse wave, and the transmission speed of the electromagnetic wave is constant, the distance from the liquid level to the radar antenna can be calculated , so as to know the liquid level of the liquid surface. No transmission medium is required, and it is not affected by the atmosphere, steam, and volatile mist in the tank, and can be used for liquid level measurement of volatile media. Non-contact measurement is adopted, which is not affected by the physical properties such as the density and concentration of the liquid in the tank. expensive. The instrument needs to set many parameters, once a problem occurs, it is usually difficult to find out what caused it. If the antenna itself is accidentally stained with the medium, an error will be reported. If there is a phenomenon of crystallization and freezing, an error will be reported, and heating and heat preservation should be performed, and the antenna should be cleaned. The initial installation needs to be an empty bin, ie an empty container. Fourth, ultrasonic level gauge (internal measurement type) Ultrasonic liquid level gauge (internal measurement type) is a digital level instrument controlled by a microprocessor. In the measurement, the pulsed ultrasonic wave is sent by the sensor (transducer), and the sound wave is received by the same sensor after being reflected by the surface of the object, and converted into an electrical signal. And the distance between the sensor and the measured object is calculated from the time between the emission and reception of the sound wave. No mechanical moving parts, high reliability, simple and convenient installation, non-contact measurement, and is not affected by the viscosity and density of the liquid, the accuracy is relatively low, and the test is prone to blind spots. Pressure vessels cannot be measured, and volatile media cannot be measured. Ultrasonic liquid level gauge (external measurement type) The external measurement ultrasonic liquid level gauge is also called an externally attached type liquid level gauge. The difference from the internal measurement type liquid level gauge is that the external measurement type liquid level gauge does not need to open holes and does not need to be pre- Install. It can be directly attached to the bottom of the container and use ultrasonic penetration to penetrate the container for liquid level measurement. The advantage is that the liquid level can be measured without opening a hole, and it has the advantages of convenient installation and simple use. Widely used in various liquid media. Fifth, the capacitive liquid level gauge measures the level of the liquid level by measuring the change of capacitance. It is a metal rod inserted into the liquid container, the metal rod is used as one pole of the capacitor, and the container wall is used as the other pole of the capacitor. The medium between the two electrodes is the liquid and the gas above it. Since the dielectric constant ε1 of the liquid is different from the dielectric constant ε2 on the liquid surface, for example: ε1>ε2, then when the liquid level rises, the total dielectric constant value between the two electrodes increases and the capacitance increases accordingly. Conversely, when the liquid level drops, the value of ε decreases, and the capacitance also decreases.
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