Questions regarding the instrument status
Thread Content
For measuring liquid levels in chemical processing units, there are level gauges and interface detectors. What is the principle behind measuring the interface level of a tank? Is the interface the boundary between two media? What is its measurement principle? Please let me know, thank you
An interface is the boundary between two different media or two substances with different properties. In chemical plants, float level gauges are commonly used to measure the level in a tank. The measurement principle relies on the rising and falling of a float to determine the level position. A float-type level gauge consists of a float and a sensor. Floats are usually made of buoyant materials, such as plastic or metal. When the float is immersed in a liquid, it will rise or sink due to the buoyant force of the liquid. The sensor determines the level position by measuring the position of the float. Sensors typically use principles such as pressure or capacitance for measurement. A common measurement principle is the pressure-type float level gauge. When the float is immersed in a liquid, the pressure of the liquid is transmitted to the float; this pressure can be measured using a pressure sensor, thereby determining the level position. Another common measurement principle is the capacitive float level gauge. When the float is immersed in a liquid, the dielectric constant of the liquid differs from that of the float; as a result, a capacitor is formed between them. By measuring the change in this capacitance, the position of the boundary can be determined. It should be noted that when measuring the level boundary, the level gauge and the boundary gauge are separate. Level gauges are generally used to measure the height or level of a liquid as a whole. A level gauge, on the other hand, is specifically used to measure the position of the interface between two different media. .
The interface position refers to the location where two media meet; a magnetic flap level gauge can be used, with floats of varying buoyancy being employed based on the differences in density and buoyancy between the two media； A differential pressure level gauge can also be used; note that the level at the top of the container must not change, otherwise it will be impossible to calculate the differential pressure and the interface level ； A float level gauge can also be used.
RF admittance level gauges can also be used depending on the different dielectric constants