How to measure the liquid level with a capacitive liquid level gauge

The capacitive liquid level gauge is suitable for continuous detection of various liquids under severe conditions such as high temperature and high pressure, strong corrosion, easy crystallization, and easy clogging. The capacitive level gauge is suitable for measuring the water level of sewage, acid and alkali solution, and boiler. The whole machine does not have any movable or elastic parts, and is resistant to impact, easy to install, high in reliability and high in precision. It can replace the traditional float, input, differential pressure and other liquid level transmitters in various applications.

How to measure the liquid level with a capacitive level gauge:
Ultrasound is a dull wave, which determines the effect of pressure, temperature, airflow, and humidity on the continuous elastic medium.
Media pressure: Sound waves are unreceivable under vacuum but can be circulated under micro-vacuum conditions, but I did not initiate application in any vacuum environment, ie micro-vacuum. Because the ultrasonic matter is probably abnormal, the error is probably larger.
Medium humidity: In an atmosphere with dry saturated humidity, the sound velocity will change by 2%. The atmosphere in the water vapor contains multiple gases affecting the ultrasonic emission speed;
Space: there is a stagnation under the sound wave, there is a pipeline, affecting the ultrasonic transmission, resulting in signal loss;
Foam: A large amount of foam produced by the measured medium is easy to capture sound waves and probably nuisance sound waves;
Airflow: When the wind speed is less than 50Km/h, it can be sloppy. When the wind speed is greater than 50Km/h, it will affect the measurement result. The physical characteristics of most of the pure water and ordinary water are the same. At least the buoyancy and the use of heavy liquid level gauges can be used in pure water, such as floats, buoys, and differential pressure level gauges. However, some liquid level gauges that use the electrical characteristics of the medium or the particles of impurities to conduct measurements are probably not normal.

Capacitive level gauges measure the liquid level directly using the capacitive principle. Other measurement methods are indirect measurement, and the liquid level is sold due to the influence of working conditions. The smart capacitor level gauge is not required to have a false liquid level. The normal slurry tank must be measured during the process.
The slag in the water, not the liquid level. The liquid on the outer surface of the tank can also overflow if it is flat. And the slag to be controlled. If this is the case, it is necessary to measure the liquid level switch in the water. For example, if you want to measure the liquid level, you do not have to
To answer the height of the slag, the radar can be better, just a little more expensive than the ultrasonic.

The principle of a capacitive level gauge is to measure the time it takes for an ultrasonic pulse to travel from the time it is sent to the entire process. Vertically placed on the surface of the liquid, an ultrasonic pulse is sent to the liquid surface. After a period of time, the sensor captures the signal reflected from the liquid surface. The signal is selected and processed by the transmitter circuit, and is sent according to the ultrasonic level gauge. And take the time difference of the ultrasonic waves, and find the distance from the liquid level to the sensor.


Post time: Mar-27-2019