The working principle of common liquid level switches

Float level switch The float level switch structure is mainly designed and produced based on the principles of buoyancy and static magnetic field. The position of the float with a magnet (abbreviated as float) in the measured medium is affected by buoyancy: changes in the liquid level lead to changes in the position of the magnetic float. The magnet in the float and the sensor (reed switch) act to generate the switching signal. Tuning fork liquid level switch The working principle of the tuning fork liquid level switch is to make the tuning fork vibrate at a certain resonance frequency through a pair of piezoelectric crystals installed on the base. When the tuning fork of the tuning fork level switch is in contact with the measured medium, the frequency and amplitude of the tuning fork will change. These changes of the tuning fork level switch are detected by the intelligent circuit, processed and converted into a switch signal to reach the liquid level. for alarm or control purposes. To allow the fork to reach into the tank, a flanged or threaded process fitting is usually used to mount the fork switch to the side or top of the tank. Capacitive liquid level switch The measuring principle of capacitive liquid level switch is: the change of the level of the solid material causes the size of the area covered by the probe to change, which leads to the change of the capacitance value. The probe and the tank wall (made of conductive material) form a capacitor. When the probe is in air, a small initial capacitance value is measured. When material is injected into the tank, the capacitance value will increase correspondingly with the increase of the area of ​​the probe covered by the material, and the switch state will change. External liquid level switch External liquid level switch is a non-contact liquid level switch realized by ultrasonic technology, which is widely used in liquid detection of various liquids. The measuring probe is installed on the outer wall of the container, and belongs to a complete non-contact detection instrument for detecting the liquid level from outside the tank. The measuring probe of the instrument emits ultrasonic waves and detects its residual vibration signal in the container wall. When the liquid flows over the probe, the amplitude of the residual vibration signal will become smaller. After this change is detected by the instrument, a switch signal is output to reach the liquid level. The purpose of the bit alarm. Radio frequency admittance liquid level switch radio frequency admittance level control technology is a level control technology developed from capacitive level control technology, which is anti-hanging, more reliable, more accurate and more applicable. The meaning of 'admittance' in 'nano' is the reciprocal of impedance in electricity, which is composed of resistive, capacitive and inductive components, and 'radio frequency' is high frequency, so radio frequency admittance technology can be understood as using high Frequency measurement admittance. The high-frequency sinusoidal oscillator outputs a stable measurement signal source, and uses the bridge principle to measure the admittance of the sensor installed in the container to be measured. In the direct action mode, the output of the instrument increases with the rise of the material level. . The difference between RF admittance technology and traditional capacitance technology lies in the diversity of measurement parameters, the driving three-terminal shielding technology and the addition of two important circuits. RF admittance technology introduces measurement parameters other than capacitance, especially resistance parameters, which increases the signal-to-noise ratio of the instrument's measurement signal, greatly improving the resolution, accuracy and reliability of the instrument. The diversity of measurement parameters is also powerful. It expands the reliable application field of the instrument. Photoelectric liquid level switch The photoelectric liquid level switch uses infrared detection, using the principle of refraction and reflection of light, the light will produce reflection or refraction at the interface between two different media. When the liquid under test is at a high level, the liquid under test forms an interface with the photoelectric switch, and when the liquid under test is at a low level, another interface is formed between the air and the photoelectric switch. The reflected light intensity received by the receiving crystal is different, that is, corresponding to two different switching states. Ultrasonic liquid level switch The fork-shaped probe of the piezoelectric crystal inside the ultrasonic liquid level switch is separated by air. A crystal vibration frequency of 1.5MHz transmits the sound signal to the middle of the air gap. When the probe is immersed in the liquid, the crystal and the sound wave are coupled, and the ultrasonic liquid The bit switch changes state.
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