Accurate measurement of liquid levels at high temperatures: capacitance level gauges

With the continuous development of industrialization, the level control technology in various industries is more and more widely used. Especially in high temperature working conditions, such as petrochemical, metallurgy, electric power and other industries, the safety and stability of liquid level control is more important. Therefore, accurate measurement of liquid level under high temperature conditions has become a difficult problem in the industrial world.

In order to solve this problem, capacitance liquid level meter came into being. Capacitance level meter is a kind of instrument that utilizes the principle of electric capacity change between substances to measure liquid level, which has the advantages of high accuracy, high stability, high reliability, and is not easily affected by the environment. In high temperature working conditions, capacitance level gauge can still maintain a good measurement accuracy, so it is widely used in petrochemical, metallurgy, electric power, paper making, environmental protection and other fields.

Capacitance level meter is mainly composed of capacitance sensor, measurement circuit and display instrument. Capacitance sensor is the core component, its working principle is to use the electric capacity and the measured medium height is proportional to the characteristics of the measured capacitance value to determine the height of the liquid level by measuring the capacitance value. Capacitance sensor consists of capacitance plate and dielectric, capacitance plate can be metal plate, metal wire, metal pipe or metal mesh and other materials, the dielectric is insulating material. A capacitor is formed between the capacitance plate and the liquid level. When the liquid level changes, the capacitance value of the capacitor will also change, and the height of the liquid level can be determined by measuring the change of the capacitance value.

Pictures of YOFU Capacitance Level Gauge
Capacitance level meter has the following advantages:

1. High precision: due to the small amount of change in capacitance, it has high precision and can meet the occasions that require high precision of liquid level measurement.

2. High stability: Capacitance level meter has high stability of measurement and is not affected by temperature, pressure, vibration and other environmental factors.

3. Not easily affected by the medium: capacitance level gauge can be adapted to the level measurement of different media, not subject to the limitations of the media type and characteristics.

4. Safe and reliable: capacitance level meter does not need external power supply, has a better explosion-proof performance, can be used in high temperature, high pressure, flammable and explosive and other harsh environments, has a high degree of safety and reliability.

In short, capacitance level meter in high temperature working conditions to measure the liquid level has obvious advantages, but in the actual application process, still need to pay attention to the following points:

1. Select the appropriate capacitance plate material: different materials of the capacitance plate on the level of the measurement accuracy and stability of the greater impact, so in the selection of capacitance plate material, need to be combined with the specific application occasions for assessment and selection.

2. Correct installation position: the capacitance level meter should be installed in a suitable position within the liquid level change range to ensure the measurement accuracy and stability.

3. Avoid media contamination: In the process of use, you need to avoid the liquid contains impurities, sediments and other substances, so as not to affect the measurement accuracy of the capacitance level meter.

4. Regular maintenance: capacitance level meter in the long-term use of the process requires regular maintenance, such as cleaning capacitance plate, check the circuit connections, etc., to ensure its normal operation.

In general, capacitance level meter as a high-precision, high-stability level measurement instruments, play an important role in industrial production. In the future, with the continuous development of science and technology, capacitance level meter performance and application areas will continue to expand and improve, for industrial production to provide more accurate and reliable liquid level measurement solutions.