Description of the working principle of the tuning fork type liquid level switch

The tuning fork type liquid level switch is a new type of liquid level switch. It is designed and manufactured using the principle of tuning fork vibration. It is the base of the sensing rod of the tuning fork liquid level switch. The tuning fork is driven by the piezoelectric wafer, and the vibration signal is received by another piezoelectric wafer to circulate the vibration signal and resonate the sensing rod. When the material comes into contact with the sensing rod, the vibration signal gradually becomes smaller, and the control circuit outputs an electrical contact signal until the resonance stops. Because the sensitivity of the sensor bar is gradually reduced from the front end to the rear seat, no error signal will be generated when the material in the tank and the barrel are stacked upwards, touching the base of the sensor bar (the rear part) or discharging.
Simply put, the tuning fork produces mechanical vibrations under the excitation of a piezoelectric crystal, which has a certain frequency and amplitude. When the tuning fork is submerged by liquid or solid, the vibration frequency and amplitude of the tuning fork will change. This frequency change is detected by the electronic circuit and outputs a switching amount.