Capacitive level gauge
If you are looking for a versatile enough surface sensor to measure liquids, powders or other granular solids, slurries and more, a capacitive level gauge may be exactly what you are looking for.
Capacitive level gauges are operated by two electrodes forming a capacitor, often in the form of two metal plates parallel to the insulation (non-conductive or “dielectric”) that separate. In the most basic sense, capacitors conduct electrostatic energy. Store in an electric field. The capacitance of a capacitor to store this energy (known as a “capacitor”) increases with the application of voltage across the circuit and with increasing insulation volume.
Capacitors work as capacitor level sensors by processing the capacitor based on the dielectric constant of the material and the voltage used to complete the circuit. These measurements are used to determine the level of the ship. Higher levels of dielectric material lead to more capacitors, meaning that the starting material can be easily measured with the latter.
This method of measuring the level after the radio frequencies applied to the capacitor circuit is sometimes called the RF level.
for example
Let’s say we are measuring a high capacity solution stored in a large metal tank. The two electrodes that make up the capacitor will be in the form of a conductive probe, like a metal plate, and the vessel wall itself. An RF signal is activated, causing a low current to flow through the solution. This current varies depending on the amount of solution in the tank – a difference detected by the capacitor switch and translated into a suitable output for a particular application.
In addition to a wide range of materials and applications, capacitive surface sensors are capable of dealing with them, they also have the advantage of being mechanically simple, with no moving parts and minimal maintenance required. In addition, they are suitable for continuous surface and point measurements and are resistant to turbulence.
Capacitors Capacitive tank
In capacitive tank gauges, the capacitor principle is used to measure the surface. A constant voltage is applied to a metal probe inside the tank. The relevant flow is then examined. This current is proportional to the capacity of the metal probe to a second electrode. The second electrode is generally the tank wall.
Capacitive level gauge
Figure: Capacitor interpretation of the elements of a capacitive surface measurement system
False high-level signals are a common type of failure in this type of system. This type of failure can be caused by covering one of the capacitive plates with a material such as the product in it, to the extent that the measuring element is connected to ground.
Capacitive level gauge
Figure: Simple diagram to show a capacity-based level measurement system
Apart from the issue of screen coverage, the capacitive surface measuring system experiences very little operational degradation. This is because there are no moving parts.
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