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A standard RF admittance level switch is an advanced device designed to measure the level of liquids or solids in various containers by assessing their admittance. This measurement technique combines both capacitance and conductance, allowing the switch to detect the presence or absence of materials without direct contact. This non-contact operation is especially beneficial for handling corrosive or high-temperature substances. The switch is known for its high sensitivity, enabling it to detect even slight changes in level, making it suitable for precise industrial applications such as water treatment, food processing, and chemical manufacturing. With a robust design built to endure harsh environments, including extreme pressures and temperatures, the RF admittance level switch offers reliable and consistent performance, while its minimal moving parts reduce maintenance needs and facilitate easy integration into existing control systems.
Liquid Level Measurement: Precise detection in tanks for water, chemicals, and oils.
Bulk Solid Monitoring: Level measurement for powders and grains in silos.
Overfill Prevention: Prevents overflow in storage tanks by detecting high levels.
Dry Run Protection: Monitors pump operation to prevent damage from running dry.
Interface Detection: Identifies interfaces between different liquids, such as oil and water.
Wastewater Treatment: Manages levels in wastewater facilities efficiently.
Food and Beverage: Ensures level control in food processing applications.
Chemical Processing: Monitors levels of hazardous liquids in chemical plants.
Pharmaceuticals: Maintains accurate level measurement in manufacturing.
Petrochemical: Monitors liquid levels in storage and distribution systems.
Compact size.
Universal industrial power supply (15 to 80 VDC & 15 to 260 VAC).
Low power consumption.
Easy calibration.
Active shield compensation against material build-up.
Static charge safe for fly-ash, acids, plastic & other applications susceptible to static charge/electricity.
Customized process connection like Threaded/Flanged etc.
Remote electronics version available on request.
Exd version available-suitable for gas group IIC, T6 as per IEC 60079-1-2007 & IEC 600529-2001.
The RF admittance level switch operates on the principle of measuring capacitance changes to detect the level of a medium. It consists of a sensing rod and a guard electrode, which are both immersed in the material being measured.
When the sensing rod is in air, the capacitance between the rod and the guard electrode is at a certain level. As the medium (liquid or solid) rises and contacts the rod, it alters the capacitance due to the dielectric properties of the medium. This change is detected by the electronic circuit, which continuously monitors the capacitance.
When the capacitance reaches a predetermined threshold, indicating that the medium has reached a certain level, the switch activates. This can trigger an alarm, control a pump, or provide a signal to a control system, ensuring accurate level monitoring and control.
RF Admittance is a static level sensor with no moving parts. Its sensing components include:
These components form three capacitances:
A sine wave of high frequency is fed into both the Sensing Rod and the Compensation Shield. The voltage at the shield is equal to the voltage at the sense, ensuring no effective current flows between them.
This equi-potential drive to sense and shield removes the shield-sense capacitance from the measurement. The shield-earth capacitance is ignored by the circuit, eliminating the effect of material coating on the probe.
This makes the probe selectively sensitive, and through the electrostatic loading of the shield, it effectively reverses the sensitivity in the shield-earth region.
Since level detection is based on measuring the sense-earth capacitance only, level is not sensed until a sufficient amount of material covers both the sense and earth combined.