Intelligent Frequency Liquid Level Sensor

The article considers theoretical justification for creating a measuring method for liquid level in tanks containing oil, petroleum products, liquefied gases, etc., by measuring frequency functionally related to the measured level. The novelty lies in the fact that the six-element phasing network of a generator with frequency set in accordance with the measured level is formed by three external resistances and two capacitors. The third capacitor contains two plates: the top plate made of foil-coated fiberglass is located on the floating roof, and the bottom plate is the tank bottom. The microcontroller processes information in accordance with the established algorithm and calibration tables, transmitting level, mass, volume, density and temperature results to the indicator.