The RF admittance level switch is a high-reliability level detection instrument based on RF capacitance technology. It adopts patented anti-adhesion circuit design and can accurately detect the level status of various conductive/non-conductive media (such as liquids, viscous substances, powders, particles, etc.). The product triggers the switch signal by detecting the impedance change when the probe contacts the material. It is suitable for complex working conditions such as high temperature, high pressure, and strong adhesion, and is widely used in process control and safety alarm in petrochemical, electric power, metallurgy and other industries.
Reliable level detection for demanding process lines The NYSP SystemRF Admittance Switch is designed to provide stable level detection where conventional probes can struggle, helping operators identify material presence with confidence across liquids, viscous media, powders, and particles. Built on RF capacitance technology, it responds to impedance changes when the probe contacts material, turning that change into a clear switch signal for control systems. For plant engineers and procurement teams seeking a practical Level Switch for harsh operating conditions, this solution offers a dependable alternative to devices such as a Radar Level Meter or High Frequency Radar Level Transmitter when contact-based detection is preferred and process behavior demands direct measurement at the probe. Anti-adhesion design for stable operation A key advantage of this RF Admittance Switch is its patented anti-adhesion circuit design, which helps reduce false signals caused by buildup on the probe surface and supports consistent performance over time. That makes it especially well-suited to sticky, dusty, or residue-prone materials where signal drift can affect output reliability. In process environments that may also use devices such as a Magnetic Flap Level Gauge, Microwave Level Switch, Gas Flow Meter, Liquid Flow Meter, Thermal Resistor, or Armored Thermocouple, this switch fits naturally into broader instrumentation systems by providing a simple, direct switching function with less dependence on material appearance or surface conditions. Practical fit for complex industrial applications From high temperature vessels to challenging storage bins and transfer systems, the NYSP System RF Admittance Switch is a practical choice for operators who need clear level status in real working conditions. It can be used in tanks, silos, hoppers, and other equipment where conductive and non-conductive media must be monitored reliably, supporting alarms, pump control, overfill prevention, and process automation. Buyers evaluating instrumentation for long-term operation will find value in its ability to handle diverse media types and difficult process states, making it a dependable component for OEMs, distributors, and maintenance teams that need consistent level control without unnecessary complexity. How it works The working principle of the RF admittance level switch is based on radio frequency (RF) capacitance technology. A radio frequency is applied to the probe, and the influence caused by the surrounding environment is determined through continuous analysis. Because all materials have a dielectric constant and their conductivity is different from that of air, the total impedance reflected by the small capacitance offset changes when the probe contacts the material. Because the energized probe and the container wall form the two plates of the capacitor, the insulator of the probe and the surrounding air become dielectric materials. When air (whose dielectric constant is 1.0) is replaced by any other material (dielectric constant>1), the capacitance effect is enhanced. This changes the impedance of the application. That is, the change in capacitance value causes the change in impedance. This effect is measured by the circuit and compared with the reference benchmark established by the sensitivity setting (circuit). The correct setting of the sensitivity of the RF admittance level switch will affect the correct change of the sensor output. The Nu11-KoTeTM circuit of the probe allows the measurement circuit to ignore the material accumulated on the probe, otherwise it will cause sensitivity failure. The Nu11-KoTeTM circuit is excited with the same radio frequency potential as that applied to the sensing probe. Since the current cannot flow at the same potential, the Nu11-KoTeTM circuit blocks the current flow that usually flows from the energized probe through the accumulated material to the container wall. In this way, the material around the energized probe is measured, not the accumulated material. Design Principle Strong versatility: It can be applied to the measurement of various conductive and non-conductive media, such as liquids, viscous substances, particles, powders, and fly ash; Anti-adhesion: Patented anti-adhesion circuit can eliminate false signals caused by material adhesion; The probe is detachable: there is no cable connection between the controller and the probe, and the controller can be removed, replaced, and repaired at any time without affecting the inflow and outflow of materials; High and low temperature resistance: suitable for working environment of -184℃ to 280℃, and ceramic probes suitable for higher temperatures can also be provided; Output form: Double-pole double-throw relay signal output, with a status light to display the output status, and a delay function of 0 to 30 seconds; Unintelligent diagnosis: After power on, the instrument circuit automatically detects whether the working status is normal.
Key Advantages
Stable Level Detection for Difficult Media The RF Admittance Switch uses RF capacitance-based detection to sense impedance changes at the probe, which helps it maintain reliable switching even when the process medium is conductive, non-conductive, viscous, powdery, or granular. Its patented anti-adhesion circuit design reduces the impact of buildup on the probe, so plant engineers can depend on the Level Switch for more consistent status output in tanks and silos where ordinary sensors often drift or misread. Industrial Structure for Demanding Process Conditions This design is suited to harsh environments that involve high temperature, pressure, or material coating, making it a practical choice for industrial teams that need steady operation and fewer maintenance interruptions. Compared with instruments such as a Radar Level Meter, High Frequency Radar Level Transmitter, Microwave Level Switch, Magnetic Flap Level Gauge, Gas Flow Meter, Liquid Flow Meter, Armored Thermocouple, and Thermal Resistor, it serves a different but equally important role in level detection, helping simplify alarm and control tasks where reliable switching is required.
Product Model Product Selection Usage scenarios Casting machinery: detect sand level; environmental water treatment: detect sewage level; Hydraulic machinery: detect lubricating oil level; Construction machinery: Detect the material level of cement silo and mixing tank; Flour mill: detect flour and wheat grain levels; Feed mill: detect soybean meal level; Power plant: detect fly ash level; Glass factory: detect the level of quartz sand and broken glass; Chemical plant: detect the liquid level of chemical materials such as polyester, spandex, acid, alkali, etc. Boiler plant: detect the water level of the steam drum and other pressure vessels; Other occasions: detect natural gas, juice, ketchup, etc.
Storage Tanks and Process Vessels In chemical, food, and material handling lines, operators often face buildup, foam, or changing product density that can make level checking unstable. The RF Admittance Switch is well suited to these vessels because it detects the actual material contact state and converts impedance change into a switch signal, giving control systems a dependable input for high-level or low-level protection when accurate point detection is needed. Silos, Hoppers, and Bulk Material Systems In powder and granule storage areas, plant teams need a Level Switch that can handle dusty, sticky, or compacting materials without frequent cleaning. The RF Admittance Switch fits this scenario because its anti-adhesion circuit helps reduce false triggering from residue on the probe, making it a practical control device for feeders, bins, and discharge points where operators need stable level status to avoid overfill or empty-run problems.
FOTIMA company display
FAQ
Q1. What materials can this level switch detect? The unit detects the level status of conductive and non-conductive media, including liquids, viscous substances, powders, and particles. Our RF admittance switching method responds to impedance change when the probe contacts material, making it suitable for a wide range of process applications.
Q2. How does it work compared with a Radar Level Meter or Microwave Level Switch? Our RF Admittance Switch triggers a switch signal by sensing impedance change at probe contact, rather than using a non-contact signal path like a Radar Level Meter or Microwave Level Switch. This contact-based method is practical for level detection where direct material contact is acceptable.
Q3. Can it handle sticky or adhesion-prone materials? Yes, it is designed with a patented anti-adhesion circuit. That design helps us improve detection stability in materials that tend to stick to the probe, which is especially useful for viscous products, powders, and particles under complex operating conditions.
Q4. Is it suitable for demanding industrial environments? The switch is intended for complex working conditions, including high temperature and high pressure use cases mentioned in our product description. We recommend matching the probe configuration and process conditions to the actual installation point so operators can maintain reliable level detection.
Q5. Can we integrate it with existing plant instruments and control systems? Yes, the product provides a switch signal for level detection, which makes it appropriate for control logic integration. Our team can support OEMs, system integrators, and procurement teams that need a practical Level Switch solution alongside instruments such as a Magnetic Flap Level Gauge, Gas Flow Meter, Liquid Flow Meter, Armored Thermocouple, or Thermal Resistor.
