The magnetic float type liquid level gauge is installed on the extension pipe outside the tank, and the liquid level inside the tank can be clearly known by the flap indicator. A magnetic switch can also be installed on the outside of the bypass pipe as an electrical contact signal output, or a liquid level transmitter can be installed for long-distance liquid level signal transmission and liquid level control. The level gauge is a reliable safety instrument. The liquid level gauge works according to the principle of buoyancy and magnetic coupling. When the liquid level in the measured container rises and falls, the float in the main pipe of the liquid level gauge also rises and falls, and the permanent magnet steel in the float is transmitted to the field indicator through magnetic coupling, which drives the red and white flipping columns to turn 180°. When the liquid level rises, the turning column turns from white to red; when the liquid level drops, the turning column turns white, and the red and white boundary of the indicator is the actual height of the medium liquid level in the container, so as to realize the liquid level indication.
Introduction Due to the magnetic coupling isolator airtight structure, it is especially suitable for flammable, explosive and corrosive toxic liquid level detection. Therefore, the liquid level detection method in the original complex environment becomes simple, reliable and safe. The level gauge has a direct-reading feature of in-situ display. There is no need to combine multiple sets of liquid level gauges. Has a single unit for full scale measurements. The equipment has the advantages of less openings, clear display, eye-catching signs, and intuitive readings. When the liquid level gauge is directly equipped with a display instrument, the intermediate transmission of the system signal detection can be omitted to improve its transmission accuracy1.
Application Magnetic flip column level gauge is widely used in liquid level measurement and control in the production process of electric power, petroleum, chemical industry, metallurgy, environmental protection, shipbuilding, construction, food and other industries.
Install the magnetic flap liquid level indicator installed on the outside or above the barrel tank to indicate and control the sealing form in the barrel tank. A drain valve can be installed as required. The connecting flange can accept a control instrument for customized liquid level height. The indicator is composed of magnetic color chips. When the magnetic floating ball in the body tube rises with the liquid level, the color chip turns over, and the liquid level height can be displayed. Magnetic technology switches or remote transmitters can also be installed on the body tube to output switch signals or analog signals. It is suitable for high temperature, high pressure, corrosion resistance and other occasions, and can be displayed locally and controlled remotely. The body tube is made of seamless steel tube, and the connecting tube is welded by pulling holes, and there is no internal scratch. The installation method can choose side installation and top installation, and the lower end of the body is sealed.
The optional magnetic liquid level gauge has two installation methods: side-mounted and top-mounted. Either way, the remote transmission device can be bundled, so that the liquid level gauge can display the liquid level locally and monitor the liquid level remotely. The bundled magnetic flap level gauge can be called a remote transmission type magnetic flap level gauge.
Although the process of making a magnetic flap level gauge is very simple, the magnetic flap level gauge is used as a measuring instrument, especially the remote type magnetic flap level gauge. Quality is difficult to guarantee. Therefore, when purchasing a magnetic flap level gauge, you should choose a manufacturer with a production license and a good reputation. The price may be slightly higher, but the product quality is guaranteed, and the after-sales service is guaranteed.
The glass plate level gauge can be directly used to observe the liquid level of the medium in various containers. It is suitable for liquid level indication in petroleum, chemical and other industrial fields. The liquid level gauge has a simple structure, intuitive and clear observation, no blockage, no leakage, convenient installation and simple maintenance. The upper and lower mounting flanges of the glass plate liquid level gauge are connected with the container to form a communication device, and the actual height of the liquid level in the container can be directly observed through the glass plate. The upper and lower valves are equipped with safety steel balls. When the glass is accidentally damaged, the steel balls are automatically sealed under the action of the internal pressure of the container to prevent the liquid from overflowing in the container and ensure the safety of operators. The magnetic float type liquid level gauge is installed on the extension pipe outside the tank, and the liquid level inside the tank can be clearly known by the flap indicator. A magnetic switch can also be installed on the outside of the bypass pipe as an electrical contact signal output, or a liquid level transmitter can be installed for long-distance liquid level signal transmission and liquid level control. The level gauge is a reliable safety instrument. Due to the magnetic coupling isolator hermetic structure. Especially suitable for flammable, explosive and corrosive toxic liquid level detection. Therefore, the liquid level detection method in the original complex environment becomes simple, reliable and safe. The level gauge has a direct-reading feature of in-situ display. There is no need to combine multiple sets of liquid level gauges. Has a single unit for full scale measurements. The equipment has the advantages of less openings, clear display, eye-catching signs, and intuitive readings. When the liquid level gauge is directly equipped with a display instrument, the intermediate transmission of the system signal detection can be omitted to improve its transmission accuracy1.
Factors that should be considered when choosing a magnetic level meter When choosing a level meter, the following factors should be considered:
(1) Measurement objects, such as the physical and chemical properties of the measured medium, as well as the working pressure and temperature, installation conditions, the speed of liquid level change, etc.;
(2) Measurement and control requirements, such as measurement range, measurement (or control) accuracy, display mode, on-site indication, remote indication, interface with computer, safety and corrosion resistance, reliability and convenience of construction.
The float type liquid level gauge puts a hollow float ball in the liquid. When the liquid level changes, the float ball will produce the same displacement as the liquid level change. The displacement of the float can be measured by mechanical or electrical methods, and its accuracy is ±(1~2)%. This level gauge is not suitable for high-viscosity liquids, and its output has switch control and continuous output.
In the design of water purification plants, such level gauges are mostly used for level measurement of water collection wells to control the automatic start and stop of drainage pumps.
Since the static pressure of the liquid column is proportional to the liquid level, the liquid level can be measured by measuring the static pressure of the liquid column on the reference surface with a pressure gauge. Calculate the pressure or differential pressure range according to the density of the measured medium and the liquid measurement range, and then select a pressure gauge or differential pressure gauge with suitable performance such as range and accuracy. The accuracy of this level gauge is ±(0.5~2)%.
The capacitive liquid level gauge inserts electrodes into the container. When the liquid level changes, the internal medium of the electrodes changes, and the capacitance between the electrodes (or between the electrodes and the container wall) also changes, and the change in capacitance is converted into a standardized DC signal. Its accuracy is ±(0.5~1.5)%.
The capacitive liquid level gauge has the following advantages: the sensor has no mechanical moving parts, the structure is simple and reliable; the accuracy is high; the detection end consumes less power, and the dynamic response is fast; the maintenance is convenient and the service life is long. The disadvantage is that the dielectric constant of the measured liquid is unstable, which can cause errors. Capacitive level gauges are generally used for level measurement in regulating pools, clean water pools, etc.
When the measurement range is less than 2m, rod-shaped, plate-shaped and coaxial electrodes are used; when it exceeds 2m, cable-type electrodes are used. When the measured medium is water, an electrode with an insulating layer (polyethylene available) is used.
The sensor of the ultrasonic level gauge is composed of a pair of transmitting and receiving transducers. The transmitting transducer emits ultrasonic pulses facing the liquid surface, and the ultrasonic pulses are reflected back from the liquid surface and received by the receiving transducer. According to the time from transmitting to receiving, the distance between the sensor and the liquid level can be determined, which can be converted into liquid level. Its accuracy is ±0.5%.
This type of liquid level gauge has 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, so it is mostly used in medicine pools, medicine tanks, sludge drainage pools, etc. Liquid level measurement. But this method has certain blind spots, and the price is more expensive.
In addition, the landlord mentioned that the magnetic flap level gauge should consider the demagnetization of the magnetic material. The demagnetization causes the level gauge to not work properly, and the measurement results cannot be trusted by the operator. The recommended occasion for the magnetic flap liquid level gauge: places where it is not easy to read the liquid level at high places, such as towers. But not only the magnetic flap level gauge, but also the glass plate level gauge, the magnetic flap level gauge can only be used for reference. In addition, for the more important liquid level (related to process safety and equipment safety), such as the liquid level of the steam drum, it is not recommended to use a magnetic flap level gauge.
The corrosiveness and service life of the medium should also be considered for the magnetic flap level gauge, because the magnetic flap is equipped with a magnetic float in the process medium, and the corrosion resistance and thickness of the float should also be considered1.
Maintenance
1. There should be no solid impurities and magnetic impurities in the cylinder of the liquid level gauge, so as to avoid jamming the float and weaken the buoyancy.
2. According to the condition of the medium, the main pipe can be cleaned regularly to remove the deposits and impurities in the pipe.
3. After cleaning the liquid level gauge or when replacing the float, open the drain flange. When installing the magnetic float, pay attention to the heavy end with the magnetic end facing upwards and cannot be installed upside down.
4. For low-temperature and liquefied gas-specific products, the main body of the liquid level gauge is insulated with a vacuum jacket. Be careful not to damage the jacket during installation and use, so as not to affect the quality of the product.
Repair and maintenance
1. The level gauge should be cleaned once a month
2. When cleaning, first open the screw cap of the water level gauge iron pipe of the liquid level gauge, carefully take out the level gauge, and then clean up the debris around the equipment.
3. The liquid level gauge should be placed neatly, the pipelines and lines should be organized; the lubrication should be good, and the oil should be refueled or changed on time, and the oil should be continuously oiled without dry friction. It is required to clean the oil gun, oil cup and linoleum; it is also possible to use trichloroethylene or alcohol to inject the pressure-impressing hole to the half of its height and soak it for about 5 minutes, then shake it slightly and repeat it several times until it is cleaned. Do not use any utensils to clean the pressure-inducing holes, so as not to damage the pressure-sensitive diaphragm of the sensitive core.
4. To clean the liquid level of the inner medium of the liquid level gauge, avoid using brushes or metal tools with excessive hardness to avoid damage to the sensitive core and pressure interface threads.
5. After cleaning, put the liquid level gauge back into the iron pipe slowly, feel that the lower part of the iron pipe has been placed, install the screw cap back to its original place, and then reinstall the level gauge after removing and cleaning, It is necessary to compare the water level gauge of the same water level of the sluice again, and correct the detection value of the secondary instrument to ensure the correctness of the sampling data.
6. The daily maintenance of the ground preparation generally includes daily maintenance and weekly maintenance, also known as daily
Post time: 29-01-22