Capacitive level sensors

The capacitive level sensor is a high–tech and reliable device

To measure the level in tanks and containers filled with a liquid medium, a capacitive level sensor is used – a device based on the method of comparing data on the electrical capacity of a capacitor-type converter. The device can be used in any liquids according to the parameters of electrical conductivity. In an electrically conductive liquid medium with a resistivity value within 106 ohms * m (no more), it is necessary to isolate one electrode. In non-conductive liquids, the electrodes do not need to be isolated.

The principle of operation of the device

The principle of operation is explained quite logically: the electrical properties of a space filled with a gaseous substance above the liquid level and the electrical properties of the liquid medium itself are different. The operation of the device is based on the calculation of this difference.

The characteristics of the dielectric constant and their transformations are controlled by an electric capacitor, the main node of the system, characterized by high sensitivity. Other equally important components of the system are responsible for receiving the signal and transmitting it to the control unit – a cable conductor or rod and a secondary converter.

Also, the capacitive liquid level sensor has sensitive elements that are immersed in a liquid medium, and elements that are located above the liquid level from the outside. These parts are measured, after which the level gauge compares the data obtained, determines the level of the liquid column and transmits the information.

Scope of application

The equipment monitors continuously, because there are objects that will not be able to fully function without constant measurements. These areas include:

• Housing and communal services systems: from sewerage to water supply and water treatment.
• Pharmaceutical industry.
• The oil refining industry.
• Food industry related to the production of liquid products (alcoholic and non-alcoholic beverages, various sauces, mayonnaise, etc.).
• Manufacturing enterprises in the field of chemical industry (building materials of liquid consistency, household chemicals, paint and varnish compositions).
• Transportation of fuel, arrangement of tanks and tanks for transportation.
• Extraction of artesian water, sale of water.

The purpose of the level gauge

The purpose of the capacitive water level sensor is two:

• Simple monitoring of the current level of the liquid composition in continuous mode.
• Monitoring of changes: decrease or increase of the current level.

High-tech devices are an integral part of the system of many liquid storages, tanks and fuel tanks, pipelines.

Advantages and disadvantages of the device

The level gauge has undeniable advantages:

• Versatility of application: of course, the medium must be liquid, but it can be different in characteristics and composition, density and electrical conductivity.
• Durability, wear resistance and reliability of the device.
• Safety of operation.
• The possibility of application in vacuum, in aggressive and chemical liquid media.
• Fast response rate to level changes due to high sensitivity.
• Adequate cost and availability of the device for sale in the online store.

The disadvantage of the equipment is one – it cannot be used to carry out measurements in explosive compositions, in viscous and crystallizing liquids, since manipulations will be meaningless due to the bias of the information received. It is necessary to adjust the device settings for an environment with different characteristics and properties.

Connection diagram

A capacitive level sensor is connected using various types of circuits: analog and digital, two-wire. It is also possible to install using a cable conductor or a pipe nozzle.

After connecting the level meter according to the selected scheme, you need to make a trial test run. For accurate data control, first you need to perform manipulations in an empty container, then in a filled one to a certain level.

Attention! It is important that tanks, tanks and other containers have metal walls, otherwise there is no guarantee of measurement accuracy. Also, do not forget to leave the probe parallel to the mounting wall.

Advantages of working with SALUTECH

The website presents products from various groups of equipment: you can buy not only a capacitive liquid level sensor from us, but also other high-tech measuring devices, shut-off valves, drive and vibration equipment.

Visit the website, study the catalog and prices, you will see: we offer only high-quality goods with a guarantee at the lowest cost in the region.