I. Tuning Fork Vibration Principle
The core component of a tuning fork level switch is a pair of precisely designed tuning forks. These forks vibrate freely at a specific frequency, similar to the sound waves produced when a tuning fork is struck in the air. The vibration of the forks is driven by an electrical signal generated by a built-in oscillator. These signals are amplified and processed, converting them into mechanical vibrations of the forks.
II. Impact of Liquid Contact
When the forks of the tuning fork level switch come into contact with a liquid, the density and damping properties of the liquid affect the vibration of the forks. This impact results in changes in the frequency, amplitude, or phase of the fork vibrations. Detecting these changes is key to the operation of the tuning fork level switch.
III. Frequency Change Detection
The tuning fork level switch contains precise sensors that detect changes in the vibration frequency of the forks. As soon as the forks come into contact with the liquid, these sensors capture the changes and convert them into electrical signals. These signals form the basis for further processing to determine the presence of a liquid level.
IV. Electronic Circuit Processing
The detected electrical signals need to be processed by electronic circuits. The main functions of these circuits are to amplify, filter, and compare the signals to accurately identify changes in the tuning fork vibration frequency. The processed signals become clearer and more stable, facilitating subsequent control of switch output.
V. Switch Output Control
The signals processed by the electronic circuits further control the switch output. When the forks come into contact with the liquid, the switch output changes, typically switching from a closed state to an open state (or vice versa). This switch output can be directly connected to control systems for functions such as level alarms or automatic start/stop.
VI. Oscillator and Control Section
The oscillator in the tuning fork level switch generates the electrical signals that drive the fork vibrations. The stability and accuracy of the oscillator directly influence the performance of the tuning fork level switch. The control section monitors and adjusts the entire system to ensure accurate liquid level detection and reliable switch signal output.
VII. Advantages and Application Range
Due to its unique working principle and advantages, the tuning fork level switch is widely used in various level detection scenarios. Its non-contact measurement, resistance to medium characteristics, and ease of maintenance make it particularly suitable for corrosive, viscous, or crystallizing liquids. Additionally, the tuning fork level switch offers high reliability, long lifespan, and rapid response, making it an indispensable component in the field of industrial automation.
In conclusion, the working principle of the tuning fork level switch encompasses several aspects: tuning fork vibration principle, impact of liquid contact, frequency change detection, electronic circuit processing, switch output control, and the oscillator and control section. By deeply understanding these principles and features, we can better apply tuning fork level switches to achieve accurate and reliable liquid level detection and control.