Breaking the Blind Spots: How Soway RF Admittance Level Sensors Conquer Liquids, Solids, Slurries and Foams with Adaptive Frequency Admittance Technology

In industrial process control, level measurement is never a one-size-fits-all task. High-viscosity asphalt, scaling sewage, fluffy activated carbon, foaming solvents, oil-water interfaces—traditional capacitance, ultrasonic, or radar solutions often fail in at least one of these cases. Shenzhen Soway Tech Limited (Soway) has launched the SFC5 Series RF Admittance Level Sensor, powered by advanced adaptive-frequency RF admittance capacitance technology. This innovative method transforms “multi-media, multi-state, multi-interface” complexity into a single master key—handling liquids, solids, slurries, foams, and layered interfaces with one sensor.

1. Adaptive Frequency RF Admittance: Eliminating Build-up Errors with Dual Vector Analysis

Conventional capacitance probes are vulnerable to “build-up” issues—when materials stick to the electrode, the measured capacitance drifts, causing false readings. Soway’s RF admittance method measures both capacitance and resistance simultaneously, applying a high-frequency signal (15–400 kHz) to distinguish true level changes from electrode contamination.

An internal algorithm processes the admittance vector, compensating for the effect of material buildup and maintaining stable accuracy over time. This allows precise and repeatable level detection, even in applications with sticky sludge, waxy oils, or resin layers—without the need for frequent cleaning.

2. Five-in-One Measurement: Liquids, Solids, Slurries, Foams, Interfaces

Liquids

Water, diesel, acids, bases—the SFC5 Series handles media with dielectric constants from low to high (typical accuracy ±2%FS for water). The sensor’s design ensures consistent results in both conductive and non-conductive liquids.

Solids

Plastic pellets, flour, or cement powder—the robust RF admittance principle resists the effects of dust, static, and bridging, ensuring reliable level monitoring in silos or hoppers.

Slurries

In challenging processes such as gypsum, sewage, or viscous slurries, the SFC5 sensor maintains measurement stability without mechanical wear. Its solid-state design ensures excellent impact resistance and long service life.

Foams

In fermentation, cleaning, or surfactant applications, the sensor’s admittance algorithm can distinguish between liquid and foam layers, reducing false high-level alarms that often trouble conventional capacitance sensors.

Interfaces

For oil-water or emulsion-solvent applications, Soway’s RF admittance technology detects changes in dielectric constant, enabling interface measurement and control with reliable repeatability.

3. Built for Harsh Environments

The SFC5 Series RF Admittance Level Sensor is designed to operate under tough industrial conditions.

It supports a power supply of 9–36V DC, operates within –40°C to +85°C (integrated type) or up to +200°C (split type), and withstands pressures up to 2.5MPa.

With IP65 protection, it resists moisture and dust intrusion, ensuring long-term durability in chemical, petroleum, water treatment, and food industries.

4. Smart Output and Easy Integration

The sensor provides multiple output options, including RS485 Modbus, 4–20mA, and 0.5–4.5V analog signals, ensuring seamless integration with PLCs, DCS systems, and digital monitoring platforms.

On-site calibration allows users to easily set zero, full-scale, and measurement ranges through simple button operations, while an optional display gauge shows real-time level readings.

5. The All-in-One Solution for Complex Level Measurement

Choose the true master key—Soway’s SFC5 Series RF Admittance Level Sensor.

With adaptive-frequency admittance technology and robust industrial design, it effectively addresses the five major challenges of level detection: buildup, foam, interface, high temperature, and high pressure.

One sensor brings liquids, solids, slurries, foams, and layered interfaces under precise, stable, and intelligent control—helping industries achieve safer, smarter, and more efficient process management.