How does a capacitive level gauge work, how does a capacitive level gauge work?

The capacitive level gauge is based on the principle of capacitive induction, which causes the capacitance to change when the height of the measured medium is immersed in the measurement electrode. It can convert the changes in the height of various levels and liquid levels into standard current signals, which can be transmitted to the operation control room for centralized display, alarm or automatic control by secondary instruments or computer devices. Capacitive level gauge Shanghai Menghui uses the change of measurement capacitance to measure the level of the liquid level.

It is a metal rod inserted into the container, the metal rod acts as one pole of the capacitor and the wall of the container acts as the other pole of the capacitor. The medium between the two electrodes is the liquid and the gas on it. Since the dielectric constant 1 of the liquid is different from the dielectric constant 2 on the liquid surface, for example:

1> 2, when the liquid level rises, the total dielectric constant value between the two electrodes of the capacitive level gauge increases, and the capacitance increases. Conversely, when the liquid level drops, the value decreases, and the capacitance also decreases. Therefore, a capacitive level gauge can measure the level of the liquid by changing the capacitance between the two electrodes.

The sensitivity of a capacitance level gauge depends mainly on the difference between the two dielectric constants, and only a constant level of 1 and 2 can guarantee an accurate level measurement, because the measured medium is conductive, so the metal rod electrodes are covered with an insulating layer. The capacitance level gauge is small in size, easy to realize remote transmission and adjustment, and is suitable for level measurement of corrosive and high-pressure media.

The working principle of the capacitive level sensor is that a capacitor is formed between the electrode inserted in the silo and the silo wall, and the capacitance is caused by the change of the position of the material in the silo.

When the change occurs, the corresponding control signal is obtained through the conversion circuit.

Because the capacitance is continuously changing, the sensor can be used as a continuous level measurement or as an alarm or input signal to the feeding and unloading equipment with a crop level switch. The level sensor has the characteristics of low cost, no mechanical wear, easy installation and maintenance.

The traditional way is to realize the conversion of capacitance to frequency through the frequency modulation oscillation circuit, and then obtain the corresponding voltage or current signal through limiting amplification and linearization of the frequency discriminator. If there is material sticking to the electrode (probe) after a period of use, it will often lead to the malfunction of the controller, and it has developed from the traditional detection capacitance to the admittance between the detection probe and the warehouse wall.

Capacitive level gauges are mainly used in the following applications:

1.In petrochemical, chemical, pharmaceutical, food and other industrial process control fields, it is used for liquid level detection, liquid level control and liquid level monitoring.

2.Level measurement, level control and level monitoring of large tanks, vessels and plants. For example, storage tanks for oil, liquefied gas, natural gas, bank warehouses, etc.

3.Waterworks, thermal power plants, paper mills and other large industrial sites are used for water level monitoring, water level control and water level alarm.

4.Liquid level monitoring and liquid level control in the fields of building and municipal engineering, such as high-rise buildings, reservoirs, rivers, sluices, etc.

5.In the field of scientific research and laboratory testing, such as chemical synthesis, level monitoring and level control in the development of new materials.

Summary. What shape is the capacitive level gauge generally made?

Capacitive level gauge is a device that converts the change of the position of the measured object into capacitance, the capacitance level gauge has the advantages of simple structure, high resolution, reliable work, fast dynamic response, non-contact measurement, and can work under harsh conditions such as high temperature, radiation and strong vibration, etc., and has been applied in various fields of industrial and agricultural production. However, the traditional capacitive level gauge adopts analog circuit, because of the change of the dielectric constant of the measured medium, the interference of stray capacitance, the temperature drift, scraping and other factors, the application range of the traditional capacitive level gauge is limited.

What shape is the capacitive level gauge generally made?

Capacitive level gauge is a device that converts the change of the position of the measured object into capacitance, the capacitance level gauge has the advantages of simple structure, high resolution, reliable work, fast dynamic response, non-contact measurement, and can work under harsh conditions such as high temperature, radiation and strong vibration, etc., and has been applied in various fields of industrial production. However, the traditional capacitive level gauge adopts analog circuit, because of the change of the dielectric constant of the measured medium, the interference of stray capacitance, the temperature drift, scraping and other factors, the application range of the traditional capacitive level gauge is limited. Hope it helps.

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Yes, I am familiar with capacitive level gauges. Capacitive level gauge is a commonly used liquid level measurement device to determine the level height by measuring the change in the electrical level between the liquid and the electrode.

The principle of capacitive level gauges is to measure the level by using the change in capacitance between two or more electrodes and the liquid. When the electrode is partially immersed in the liquid, the distance between the liquid and the electrode and the capacitance value will change. By measuring the change in capacitance, the height of the liquid can be determined.

Capacitive level gauge has the advantages of high accuracy, fast response and wide range of application, and can be widely used in various industrial occasions. However, when using a capacitive level meter, it is necessary to pay attention to the influence of the conductivity, dielectric constant and other factors of the liquid on the measurement results, as well as the selection of suitable electrode materials. Tease.

Summary. The installation and connection methods of the capacitor test solution position include flange connection, threaded connection and other special customizations, and different connection methods can be selected according to the actual working conditions of the site.

The installation and connection methods of the capacitor test solution position include flange connection, threaded connection and other special customizations, and different connection and connection methods can be selected according to the actual working conditions of the site.

Precautions. The instrument has no current output, and it should be checked whether the addition and subtraction of the virtual base signal processor is loose and falls off. Timely reinforcement.

It's just 0. Touch the signal processor sensor with a metal tool in your hand, and the terminal meter indication should be increased, otherwise it indicates that the instrument signal processor is damaged and the instrument signal processor needs to be replaced. Ways to check the sensor.

Discrimination and elimination of interference. The capacitive level gauge lights up when it fluctuates. Instructions.

Correct answer: A capacitive sensor that converts the change of the liquid level of the measured medium into a capacitance change. a：

When the measured substance is a non-conductive pat substance, the dielectric constant between the two electrodes will change when the measured liquid level changes, resulting in a change in capacitance. B: When the measured substance is a conductive liquid, the area of the external electrode is changing when the liquid level changes, which is a variable area capacitive sensing device.