Capacitive level transducer is a typical example of indirect measurement of level
Capacitance level sensors are useful for wide variety of solids, aqueous and organic liquids, and slurries. The technique is frequently referred as RF as radio frequency signals applied to the capacitance circuit. The sensors can be designed to sense material with dielectric constants only 1.1 (coke and fly ash) and as high as 88 (water) or more. Sludges and slurries such as for example dehydrated cake and sewage slurry (dielectric constant approx. 50) and liquid chemicals such as for example quicklime (dielectric constant approx. 90) may also be sensed. Dual-probe capacitance level sensors may also be used to sense the interface between two immiscible liquids with substantially different dielectric constants.Hit on capacitance level switch to explore more about our services and sites. Hope you ll like our more services.
Since capacitance level sensors are electronics, phase modulation and the usage of higher frequencies makes the sensor suitable for applications by which dielectric constants are similar.
Working Principle:
The principle of capacitive level measurement is dependant on change of capacitance. An insulated electrode acts as one plate of capacitor and the tank wall (or reference electrode in a non-metallic vessel) acts as the other plate. The capacitance depends on the fluid level. An empty tank has a lower capacitance while a filled tank has a higher capacitance.
An easy capacitor consists of two electrode plate separated with a small thickness of an insulator such as for example solid, liquid, gas, or vacuum. This insulator is also referred to as as dielectric.