Capacitive level gaugeIt is an industrial instrument that continuously measures the height of liquid, solid, or slurry in a container based on the principle of capacitive induction. It is widely used in industries such as petroleum, chemical, power, food, pharmaceuticals, water treatment, and environmental protection. The core principle is to utilize the difference in dielectric constant between the measured medium and air (or container wall). When the level changes, the capacitance formed between the sensor electrode and the container wall (or reference electrode) changes accordingly. This capacitance value is detected by a high-precision circuit and converted into a corresponding level signal output.
Capacitive level gauges have a simple structure and no mechanical moving parts. They typically consist of probes (rod, cable, or coaxial), transmitters, and mounting flanges. The probe can be directly inserted into the container and is suitable for atmospheric pressure, high pressure, high temperature, corrosive or dusty environments. For different media, probes made of materials such as PTFE, 316L stainless steel, and Hastelloy can be selected, and they support explosion-proof (Ex d/Ex ia) and sanitary (such as 3A, EHEDG) designs to meet the requirements of harsh working conditions. For conductive media, an insulation layer (such as PTFE coating) needs to be added to the surface of the probe to form an effective electric field; For non-conductive media, measurement relies on the difference between their own dielectric constant and air.
Capacitive level gaugeThe main application scope is:
1、 Industrial production field
chemical industry
Application scenario: Used for measuring the height of liquid or solid materials in equipment such as storage tanks, reactors, separators, etc.
Advantages: There are various types of chemical media, some of which have corrosive or high-temperature and high-pressure characteristics. The level gauge can use corrosion-resistant and high-temperature resistant sensor materials (such as polytetrafluoroethylene, ceramics, etc.) to adapt to complex working conditions.
Typical case: Measuring the liquid level of corrosive liquids such as sulfuric acid and hydrochloric acid, or the material level of solid materials such as plastic particles and fertilizers.
petroleum industry
Application scenario: Used for liquid level or interface measurement of equipment such as oil tanks, gas storage tanks, separators, etc.
Advantages: Petroleum media are flammable and explosive, and the level gauge can adopt explosion-proof design to ensure safe operation. Meanwhile, its high-precision measurement capability can meet the strict requirements of the petroleum industry for measurement accuracy.
Typical case: Measuring the liquid level of media such as crude oil, refined oil, liquefied gas, or detecting layer separation at the oil-water interface.
Food and Beverage Industry
Application scenarios: Used for liquid level measurement of syrup, juice, milk, beer and other liquids, as well as level monitoring of solid materials such as grains and flour.
Advantages: Food grade sensor materials (such as stainless steel, polypropylene, etc.) meet hygiene standards and avoid contaminating media. Meanwhile, the level gauge can achieve non-contact measurement, reducing interference with the medium.
Typical case: Measuring the liquid level in a beer fermentation tank or monitoring the material level in a flour bin.
pharmaceutical industry
Application scenarios: Used for liquid level measurement of media such as pharmaceuticals, solvents, and raw materials, as well as level control of solid materials such as powders and particles.
Advantage: The pharmaceutical industry has high requirements for cleanliness and precision. The level gauge can adopt a sealed design to prevent medium leakage and provide high-precision measurement data to meet production needs.
Typical case: Measure the liquid level of the medicine in the reaction kettle, or monitor the powder level in the drying tower.
2、 Environmental Protection and Water Treatment Field
sewage treatment
Application scenario: Used for liquid level measurement of sewage tanks, sedimentation tanks, neutralization tanks and other equipment, as well as monitoring of sludge level.
Advantages: The composition of sewage media is complex and may contain suspended solids, corrosive substances, etc. The level gauge can be equipped with corrosion-resistant sensors and self-cleaning function to reduce the risk of blockage.
Typical case: Measuring liquid level in the aeration tank of a sewage treatment plant, or monitoring material level in a sludge concentration tank.
water resources management
Application scenarios: Used for liquid level measurement of water sources such as reservoirs, water towers, and groundwater wells, as well as water level monitoring of irrigation channels.
Advantages: The level gauge can achieve remote monitoring and transmit data to the control center through wireless communication modules, facilitating water resource scheduling and management.
Typical case: Measuring water tower levels in urban water supply systems or monitoring channel water levels in agricultural irrigation.
3、 Energy and Power Sector
power industry
Application scenarios: Used for liquid level measurement of equipment such as boiler steam drums, deaerators, condensers, as well as monitoring of solid material levels in coal and ash silos.
Advantage: The power industry has high requirements for equipment safety and stability. The level gauge can adopt high temperature and high pressure design, adapt to harsh environments such as boilers, and provide reliable measurement data.
Typical case: Measuring water level in boiler steam drum or monitoring coal level in coal bunker.
new energy sector
Application scenarios: Used for liquid level measurement of solar water heaters, ground source heat pumps and other equipment, as well as material level control of biomass fuel silos.
Advantage: New energy equipment usually has high requirements for energy efficiency and environmental friendliness. The level gauge can achieve low-power operation and reduce the risk of medium contamination.
Typical case: Measuring water level in solar water heaters or monitoring fuel tank levels in biomass power plants.