The application of radio frequency admittance level measurement in methacrylate interface

The working principle of radio frequency admittance level rf admittance level is developed in recent years a new type of liquid level meter. Radio frequency admittance is a developed from the condenser, hanging applicability broader, more reliable, more accurate, liquid level control technology, radio frequency admittance of the meaning of the admittance to the reciprocal of electrical impedance in, its element by resistive, capacitive component, the perceptual component integrated, and radio frequency or high frequency radio spectrum, so the radio frequency admittance can be understood as admittance value is measured with a high frequency radio waves. Radio frequency admittance level measurement principle: laboratory, parallel plate capacitor is an ideal type of capacitor, the capacitance is: C = & epsilon; XS/D, e for two capacitance between the plate medium dielectric constant, S as the area between two plates, D is the distance between the two plates. To a liquid surface, install a measuring electrode system, forming a coaxial capacitor. Container is a capacitance C = & epsilon; 0 xs XH0 / D +ε 用于( H - H0) / D, including & epsilon; 0 for the dielectric constant of air between the two electrodes, & epsilon; 0 = 1. 0006, approximate = 1; ε As the medium between the two electrodes dielectric constant, S for the equivalent area between two plates, D is the distance between the two plates, H0 for air section of the probe length, H for the length of the probe. For a liquid surface under test, the material of e is fixed, S, D is fixed and so on will be derived, measure the height of the capacitance and the material is proportional to the. By testing bridge adjustable capacitance can balance out of the way the initial capacitor, including installing capacitor and cable capacitance, capacitance probe material left, the capacitance signal after amplification, output a signal is proportional to the material level. By the above you can see the size of the capacitance C = & epsilon; 0 xs XH0 / D +ε XSX( H - H0) / D depends mainly on two kinds of dielectric permittivity & epsilon; 0、ε And changes in H0. Due to the dielectric constants of methyl to 2. 2, and the dielectric constant of water is 80. Methyl 1, so can be ignored, as long as measure the position of the water, is equivalent to measure the methyl ester and water interface. In practice when the tower interface of 0, methyl brought about by the zero error of 25%. But the table of zero adjustment range can be up to 50% of the range can will bring the error compensation of methyl off completely. Radio frequency admittance level in jilin petrochemical company methacrylate extraction tower C - calcium carbide factory 330 interface measurement transformation has stable operation, precise indication, provide a reliable basis for process running smoothly.