RF Admittance Level Sensor Structure
The RF admittance level sensor is designed around a stable and interference-resistant measurement structure that ensures accurate level detection in liquids, slurries, powders, and viscous or sticky materials. Its core structure is composed of several coordinated parts that work together to maintain reliable and stable output even in challenging industrial conditions.
1. Probe Assembly
The probe is the primary sensing component that enters the tank or silo.
It typically includes:
Sensing rod or coaxial probe
Protective insulation layer, preventing material buildup from affecting measurement
Process connection such as thread or flange
The design allows the probe to withstand abrasion, corrosion, and high-viscosity media.
2. RF Admittance Measurement Circuit
This is the heart of the sensor, responsible for generating and analyzing the RF signal.
Key functions include:
Measuring capacitance + conductance (admittance)
Eliminating errors caused by material buildup through Cote-Shield technology
Ensuring stable output despite changing material properties
3. Cote-Shield / Guard Shield Structure
A critical structural part unique to RF admittance sensors.
It prevents false signals by:
Electrically isolating buildup layers on the probe
Ensuring only the actual level triggers the output
Enhancing measurement reliability in sticky or viscous applications
4. Electronic Housing and Signal Processing Module
Includes:
Microprocessor control board
RF signal generator
Filtering and compensation circuits
Output module (relay or 4–20mA depending on model)
The enclosure protects electronics from dust, moisture, and mechanical stress — supporting stable long-term operation.
5. Power and Output Interface
Standard industrial interfaces such as:
24V DC or 220V AC power input
Relay output
Status indicators
These allow easy integration with plant control systems.
6. Mounting and Sealing Components
Includes:
Flange / threaded mounting parts
Sealing gaskets
Cable entry glands
These elements ensure proper installation and isolation from harsh environments.
