The level of the liquid medium in the container is called the liquid level, and the instrument for measuring the liquid level is called the liquid level gauge.
Level gauge is an important measurement tool for modern enterprise automation. It is mainly used for the detection and control of liquid levels of tanks, kettles, and towers in the production process. With the advancement of electronic technology, the level measurement and control technology has been greatly improved to meet the needs of enterprise automation and energy saving. As a kind of level instrument, there are many kinds of level gauges used by enterprises. This article describes the common four level gauges, namely buoyancy level gauge, differential pressure level gauge, magnetic flap level gauge, ultrasonic level gauge. Each level gauge has different characteristics and different application areas. The following specific introduction.
1, buoyancy level gauge Buoyancy level gauge is divided into two types. One is to measure the liquid level by measuring the float or buoy floating on the surface of the liquid to be measured and moved along with the change of the liquid surface. It is a constant buoyancy-type liquid level meter. It is characterized by simple structure and low price. Suitable for measuring various tanks. The other method is to detect the liquid level by using the relationship between the buoyancy and the liquid level of the buoy immersed in the liquid to be measured, and to change the buoyancy type test, that is, a float level gauge. The meter can achieve remote transmission and automatic adjustment. When the liquid level is different, the volume of the cylinder sinking in the liquid is different, displacement occurs due to different buoyancy, and the fluid level is measured by the mechanical transmission converted into angular displacement.
2. Differential pressure level gauge Differential pressure level gauge uses a pressure gauge to measure the static pressure of the liquid column in the container and then measure the liquid level. The level gauge usually has two pressure extraction ports, which are gas-phase and liquid-phase pressure-taking ports. The gas-phase pressure-taking point is used to measure the gas-phase pressure in the equipment; the liquid-phase pressure-sucking point is affected by the gas phase pressure and is also affected by the static pressure of the liquid column. The effect of the static pressure generated by the liquid column is the difference between the liquid and vapor pressures. The liquid level is proportional to the static pressure generated by the liquid column, so the level can be measured using static pressure. The choice of pressure gauge or differential pressure gauge with proper measuring range and accuracy is determined by the measured density of the medium and the liquid measuring range, the calculated pressure or pressure difference range. This level gauge is equipped with a differential pressure transmitter, which can realize remote transmission function. It is widely used in the industrial field and belongs to a more mature level gauge. The accuracy of the differential pressure level gauge is low. In order to reduce the influence of temperature and medium density on the measurement accuracy, many test instruments are required, and the cost will be greatly increased.
3, magnetic flip level gauge based on the buoyancy principle and magnetic coupling effect developed. When the liquid level in the tested container rises or falls, the magnetic float in the liquid level gauge also rises or falls with the liquid level, and transmits through the magnetic coupling. The permanent magnet in the float drives the magnetic column indicator to make the red If the liquid level rises, the column will turn from white to red. If the liquid level drops, the column will turn from red to white. The actual height of the liquid level is the red-white junction on the indicator. The level of the liquid in the container can be clearly indicated.
Highly-sealed, leak-proof magnetic flap level gauges are used in applications that are toxic, hazardous, highly corrosive, high temperature, and high pressure and can show their superiority. Such level gauges are mechanical level gauges, so no additional power is required. Because the display part and the measured medium are isolated from each other, the measurement reading will not be affected because the measured medium contaminates the display part. The user installs the level transmitter according to the need to output the current signal and can realize remote detection or control. .
Small maintenance, low maintenance costs. The magnetic flap level gauge has a simple structure and is easy to install. The actual application is not easy to leak, and it is not easy to be blocked. The level of the media in the container can be directly and clearly observed. Therefore, it is suitable for liquid level measurement in the fields of petroleum, chemical and other industries. It is also suitable for medium level measurement of various towers, tanks, tanks, spherical vessels and boilers.
4, ultrasonic level gauge ultrasonic level gauge is a microprocessor-controlled digital level instrument. In the measurement, the pulsed ultrasonic wave is emitted by the sensor (transducer), and the acoustic wave is reflected by the surface of the object and is then received by the same sensor and converted into an electrical signal. The distance from the sensor to the measured object is calculated from the time between the transmission of the sound waves and the reception.
Ultrasonic level gauge is a liquid level instrument controlled by a microprocessor. It is almost free from media restrictions, and is not affected by the viscosity, density, etc. of liquids. It can realize temperature compensation of measured values, non-contact measurement, no mechanical moving parts, and installation. Simple, convenient, simple operation, intuitive interface, can be applied to a variety of liquid or solid material height measurement.
The above analysis is a more common level gauge. In addition to the four level gauges, the level gauges used in the enterprise include radar level gauges, magnetostrictive level gauges, servo level gauges, and capacitance level gauges. , RF admittance level gauge, strip gauge, static magnetic grid level gauge and so on. Each level gauge has its own working principle, characteristics and application range, so for different industrial applications, it is necessary to select the applicable level gauge type according to the specific situation. With the development of industrial technology, the liquid level gauge has played an increasingly important role in the measurement of the liquid level. Therefore, the development of the liquid level gauge also shows the development of a country’s industrial level. Therefore, we must seriously study and study it. And continuous innovation, pioneering a new era of level gauge measurement.
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