The capacitive liquid level sensor is one of the commonly used liquid level transmitters. It is often used as a water tank to measure and indicate the liquid level of the fuel tank. The Capacitive liquid level sensor sold by Sino-Inst can measure highly corrosive liquids, measure high temperatures, and measure the liquid level of sealed containers. It has nothing to do with the viscosity, density, and pressure of the medium. Let’s learn about the working principle, characteristics, advantages, and disadvantages of the Capacitive liquid level sensor.

How does a capacitive liquid level sensor work?

What is a capacitive liquid level sensor?

The capacitive liquid level sensor is a liquid level sensor based on the principle of capacitive sensing. It is also called the capacitance level gauge. When the height of the measuring electrode changes by the measured medium, it causes its capacitance to change.

The Capacitive liquid level sensor can convert the changes of various levels, liquid level, and medium height into standard current signals, which are remotely transmitted to the operation control room for secondary instruments or computer devices for centralized display, alarm, or automatic control.

Capacitive liquid level sensor with good structure and installation method can be applied to high temperature, high pressure, strong corrosion, easy to crystallize, anti-clogging, anti-freezing, and solid powder and granular materials.

Sino-Inst’s capacitive liquid level sensor can measure the liquid level of a highly corrosive medium. It measures the liquid level of a high-temperature medium. It measures the liquid level of sealed containers. It has nothing to do with the viscosity, density, and working pressure of the medium.

Features of capacitive liquid level sensors

  • The structure is simple, without any movable or elastic components. Therefore, the reliability is extremely high and maintenance is minimal. Under normal circumstances, it is not necessary to carry out regular large, medium and small maintenance.
  • Various signal output. Facilitate the configuration of different systems.
  • Suitable for liquid level measurement of high temperature and high-pressure vessels. And the measured value is not affected by the temperature, specific gravity of the liquid being measured and the shape and pressure of the container.
  • It is especially suitable for the measurement of strong corrosive liquids such as acids and alkalis.
  • Perfect over-current, over-voltage, and power polarity protection.

Capacitive liquid level sensors types

How does a capacitive liquid level sensor work?

The Capacitive liquid level sensor is used to measure the change of capacitance to measure the level of the liquid level. The capacitive liquid level sensor is used to measure the change of capacitance to measure the unevenness of the liquid level.

The capacitive liquid level sensor is a metal rod pierced into the liquid container. The metal rod serves as a pole of the capacitor. The container wall serves as the other pole of the capacitor. The medium between the two electrodes is the liquid and the gas above it.

Because 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 between the two electrodes of the capacitive liquid level gauge increases accordingly, so the capacitance increases.
Conversely, when the liquid level drops, the value of ε decreases and the capacitance also decreases.

Therefore, the Capacitive liquid level sensor can measure the unevenness of the liquid level by changing the capacitance between the two electrodes. The sensitivity of the Capacitive liquid level sensor mainly depends on the difference between the two dielectric constants.

Moreover, as long as ε1 and ε2 are stable, the liquid level measurement is accurate. Because the measured medium has conductivity. Therefore, the metal rod electrode is covered by an insulating layer.

The capacitive liquid level sensor is small in size, simple to complete remote transmission and scheduling, suitable for liquid level measurement of corrosive and high-pressure media.

Let’s watch a video. It will help you understand the working principle of the capacitive liquid level sensor.

Video source: https://www.youtube.com/watch?v=0du-QU1Q0T4

Capacitive level sensor Applications

The capacitive liquid level sensor is used to measure the liquid level (level) of conductive and non-conductive liquids (solids) under pressure in pressure vessels.

A capacitive liquid level sensor can convert the changes of various liquid level parameters into standard current signals. Remote transmission to the operating room. For the secondary instrument or computer device for centralized display, start emergency signal or automatic control.

Combine the user’s specific process conditions, equipment structure, and use requirements. Through the flexible combination of the material, structure, and installation method of the level gauge. It is suitable for continuous detection of liquid level, material level or material level under special conditions such as high pressure, high temperature, strong corrosion, easy crystallization, anti-blocking, anti-freezing, and solid powder and granular materials. It can be widely used in detection and control in various industrial processes.

Capacitive level sensor application:

  • Conductive, insulating liquid-chemical industry, oil field, water and sewage treatment
  • Conductive and insulating slurry-papermaking, pharmaceutical, water and sewage treatment
  • Powder, ash, powder-power plant, metallurgy, cement
  • Pellets, coal, grain-power plants, metallurgy, grain
  • Interface, two different liquids-oil field, chemical industry

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Capacitive oil level sensor

The capacitive fuel level sensor refers to a capacitive liquid level transmitter used to measure the oil level. According to the principle of capacitance sensing, when the height of the measured electrode dips and changes, the capacitance of the measured electrode changes. It can convert the change of oil level into a standard current signal. It is remotely transmitted to the operation control room for the secondary instrument or computer device for centralized display, alarm, or automatic control.

Read more about Capacitive Fuel Level Sensor

 Capacitive water level sensor

Capacitive sensor for water level measurement

A capacitive water level sensor is often used to measure the water level of the water storage tank. The capacitive water level sensor uses the change of measuring capacitance value to measure the height of the liquid level. The main function is to continuously measure the liquid level of the measured medium liquid. For example, common media are sewage, mud, paper pulp, eight-treasure porridge, and so on. You may also have heard of a non-contact capacitive water level sensor. It is a kind of capacitive water level sensor installed externally.

Read More about Contact and Non-contact | Capacitive water level sensor

Capacitive level switch

Capacitive level switch

The principle of a Capacitive level switch is a position sensor with switch output.

The capacitive level switch is composed of an electronic circuit module unit and sensor rod. The induction pole and the barrel wall are used as the two electrodes of the capacitor.

When the material between the two electrodes changes, the capacitance value changes. After the electronic circuit unit detects this capacitance value change. The analysis and processing unit are compared with the set capacitance value. When it is higher than the set value, a switch signal is an output.

It is widely used for position detection in various high temperature, high pressure, strong acid and strong alkali, and various powder and particle environments in petroleum, chemical, metallurgical, light industry, coal, cement, grain, and other industries.

More Featured Level Senors

Extended reading: Ultrasonic level transmitter for Hazardous Liquids

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Sino-Inst offers over 10 Capacitive Level Sensors for level measurement. About 50% of these are RF level meters, 40% is the tank level sensor.

A wide variety of Capacitive Level Sensors are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Capacitive Level measurement instrumentation, located in China.

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