Could the experts here explain to me some things about level switches and how to deal with common faults? Please, please

Introduction to the working principle of radio frequency admittance level gauges: The key difference between point-type radio frequency admittance technology and capacitance technology is the use of a three-terminal approach. A wire is led from the signal at the circuit unit, amplified by a in-phase amplifier; its output is connected to the shield of the coaxial cable, which is then connected to the shield of the probe. This amplifier is a non-inverting amplifier with a gain of “1”; its output signal has the same potential, phase, and frequency as the input signal, but they are isolated from each other. The ground wire is the outermost shielding layer of the cable. Due to the aforementioned relationship between the center conductor of the coaxial cable and the intermediate shield, there is no potential difference between them; as a result, no current flows, meaning no current leaks from the center conductor. In other words, there is no capacitance between them, or the capacitance is zero. Therefore, the temperature effects of the cable, as well as the installation of capacitors, have no impact. To address the issue of residue on the probe, a new probe structure with a five-layer concentric design has been adopted: the innermost layer is the central measuring rod, the middle layer is the central shielding layer, and the outermost layer consists of the grounded mounting threads; these layers are separated from one another by insulating layers. 　　As is the case with coaxial cables, there is no potential difference between the central rod and the shielding layer; even if the impedance of the material attached to the sensing element is very low, no current will flow. The electronic instruments measure only the current from the center of the probe to the opposite tank wall. Since the central element prevents current from flowing upward along the probe toward the tank wall, the current to ground can only flow through the end of the probe, through the material being measured, to the opposite tank. That is, Ua=Ub lab=(Ua‑Ub)/R=0. Due to the potential difference between the shielding layer and the container wall, a current flows between them, but this current is not measured and does not affect the measurement results. This protects the measurement end from being affected by the hanging material. Only when the liquid level in the container actually rises and comes into contact with the central measuring rod does a measurable current flow between the central measuring rod and the ground, through the material being measured. The fork-type level switch is a new type of liquid level limit switch. A tuning fork generates vibrations when excited by a crystal; when the tuning fork is submerged in a liquid, its vibration frequency changes. This change in frequency is detected by an electronic circuit, which then outputs a digital signal. 　　“The “fork-type level limit switch” is also known as an “electrical float.” It can be used in any situation where a float level switch is employed, as well as in cases where a float level switch cannot be used due to factors such as structure, turbulence, agitation, bubbles, or vibration. 　　Key features: High adaptability – varying electrical parameters and density of the material being measured have no impact on the measurement. Harsh conditions such as scaling, stirring, turbulence, bubbles, vibration, medium viscosity, high temperature, and high pressure have no impact on detection either. 　　Maintenance-free – Since the detection process of the tuning fork limit switch is carried out by electronic circuits with no moving parts, it requires no maintenance once installed and put into operation. 　　No calibration required – since the detection by the tuning fork limit switch is not affected by the electrical properties or density of the medium being measured, no on-site calibration is needed regardless of the type of liquid being measured