Technical parameters of capacitive level sensor, working principle of capacitive level sensor?

Capacitive non-contact micrometer with a capacitive probe that can measure small displacements in the range of 0-200 m with a measurement accuracy in the nanometer range. The micrometer consists of a chassis and a sensing module, which can be used for multi-channel measurements. Features:

Modular design, free assembly, single board module available, high resolution, analogue output, non-contact measuring principle: It is based on the principle of a parallel plate capacitor, the two electrodes formed by the sensor and the opposite target are protected by the protective ring capacitor principle, and the sensor is still linear when used to measure any metal. For more information, you can continue to pay attention to the core tomorrow WeChat*** or core tomorrow**:

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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.

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.

Working principle: Capacitive level gauge is used to measure the change of capacitance to measure the level of liquid. 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, such as: 1> 2, when the liquid level rises, the total dielectric constant value between the two electrodes of the capacitive level gauge increases accordingly, 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.

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.

Ask about custom messages].

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.

Capacitance level gauges measure liquid level by capacitance changes. The capacitance of a capacitor is determined by the area of the two plates as well as the characteristics of the intermediate medium (dielectric constant).

When measuring non-conductive liquids, the area of the two plates of the capacitor remains unchanged, and the change of liquid level is equivalent to the change of the dielectric constant of the intermediate medium of the capacitor, and the dielectric constant between the two plates.

Determined by the gas phase.

to be determined by the liquid phase.

The change in dielectric constant results in a change in capacitance.

When measuring a conductive liquid, the wetting area between the conductive liquid and the measuring electrode changes with the liquid level, which is equivalent to a change in the area of the capacitor plate, resulting in a change in capacitance.

The capacitive level gauge is a cable made of PTFE, and the SC-700 capacitive level gauge with PTFE straight rod is suitable for continuous detection of various liquids under harsh conditions such as high temperature and high pressure, strong corrosion, easy crystallization, and easy blockage. It is suitable for measuring the water level of sewage, acid and alkali solution, and boiler, and the whole machine has no movable or elastic parts, impact resistance, easy installation, high reliability and high precision. It can replace the traditional float, submersible, differential pressure and other liquid level transmitters in various occasions.

The core component of SC-700 capacitive level gauge adopts advanced RF capacitance detection circuit, which is converted into a standard electrical signal (generally 4 20) by 16-bit single-chip microcomputer through accurate temperature compensation and linear correction

ma）。HART, CANBUS, and 485 communication protocols are optional for system configuration. The whole series of capacitive level gauges have self-calibration function, and users can automatically calibrate "zero point" and "range" through two buttons to adapt to the different requirements of various complex places.