The measurement principle of the SFC5 Series RF Admittance Level Sensors is based on a universal level measurement technology. Admittance-based products can eliminate measurement errors caused by electrode material buildup by detecting both capacitance and resistance simultaneously. As a physical quantity concept, admittance is the reciprocal of impedance. Since inductance is rarely encountered in practical applications, the admittance referenced here actually refers to capacitance and resistance. To achieve accurate level measurement, an RF signal with an appropriate frequency is also required, and its frequency range is generally 15–400 kHz. Hence, this level measurement technology is termed RF admittance technology. RF admittance capacitive level measurement technology is developed on the basis of capacitive level measurement. It addresses the electrode material buildup issue inherent in capacitive level measurement while retaining all the advantages of this traditional capacitive technology. As the liquid level changes, the SFC5 Series RF Admittance Level Sensors convert the liquid level variation into a 0.5– 4.5V analog signal or a digital RS485 Modbus output. These sensors are equipped with an on-site calibratable function: users can perform range setting, zero-point, and full-scale calibration via buttons. When fitted with a display gauge, they can directly show the corresponding liquid level height information locally.

The SFC5 Series RF Admittance Level Sensors are suitable not only for continuous liquid level detection (e.g., for oil, water, viscous liquids, etc.) but also for providing switch alarm output for liquid level control points. The entire unit contains no movable or elastic components, offering excellent impact resistance, easy installation, and high reliability

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