The RF admittance level switch adopts advanced RF admittance technology, overcoming the defect that capacitive level switches cannot eliminate the influence of conductive hanging materials. The instrument operates reliably, and all technical indicators meet the international level of similar products. It is widely used for alarm and control of liquids, slurries, dust, material levels, and two types of liquid boundaries. In addition, the product has added on-site working status indication, making it a highly cost-effective and stable and reliable level switch.
Structural Principles
The RF admittance level switch is composed of a sensor electronic unit, which mainly includes three parts: measuring probe, shielding electrode, and grounding terminal. The height of the material is reflected by the change in admittance between the probe and the container wall. When the material reaches the switch working point, the electronic unit reacts, drives the relay to act, outputs the switch signal, and the shielding electrode can prevent misoperation signals caused by hanging materials on the electrode. The switch control signal is only output when the material truly reaches the set point.
Measuring principle
Radio frequency admittance level instrument is a level control technology developed from capacitive level measurement technology, which is anti hanging, more reliable, more accurate, and more applicable. The meaning of admittance in radio frequency admittance is the reciprocal of impedance in electricity, which is a combination of resistive, capacitive, and inductive components. And RF emits high-frequency radio waves, so RF admittance level control technology achieves level measurement by measuring the admittance of the measured medium using high-frequency radio waves.
The most important difference between RF admittance technology and capacitive technology lies in the diversity of measurement parameters and the three electrode technology. The diversity of RF admittance measurement parameters lies not only in measuring electrical capacity, but also in measuring resistance and inductance, making the measurement more accurate. The three electrode technology includes electronic units and sensors, and a shielding electrode is added between the measuring electrode and the ground electrode to protect the measuring electrode from hanging materials.
Product Features
Anti hanging material: The unique circuit design and sensor structure ensure that its measurement is not affected by sensor hanging material, and there is no need for regular cleaning to avoid mismeasurement.
Maintenance free: The measurement process has no movable parts and requires no maintenance.
Strong applicability: capable of measuring liquid and material levels, with process temperatures ranging from -100 ° C to 800 ° C; Pressure from vacuum to 5MPa; Can be applied in corrosive and impact situations.
Stable and reliable: not affected by changes in the measurement environment, with high stability and long service life.
Product Application
Conductive and insulating liquids – oil fields, chemical industry
Conductive and insulating slurry – papermaking, metallurgy
Particles, powders – grains, feed, electricity, cement, etc