Tuning fork level gauge and method and system for monitoring level

Tuning fork level gauge is a level switch widely used in industrial environment, often called tuning fork level switch or tuning fork level controller, including tuning fork level switch, tuning fork level switch and other level measuring instruments. It is designed using the principle of tuning fork vibration, and uses piezoelectric devices to drive and detect the vibration of the tuning fork rod.

Tuning fork level gauge is a level switch widely used in industrial environment, often called tuning fork level switch or tuning fork level controller, including tuning fork level switch, tuning fork level switch and other level measuring instruments. It is designed using the principle of tuning fork vibration, and uses piezoelectric devices to drive and detect the vibration of the tuning fork rod. When the material is not in contact, the tuning fork vibrates freely at the resonance frequency. When the tuning fork is in contact with the material to be tested, the vibration amplitude of the tuning fork is significantly reduced, and the output signal amplitude of the piezoelectric detection device decreases accordingly, and the signal change is detected by the intelligent circuit Analyze and output a switching signal. Simply put, the tuning fork generates mechanical vibration under the excitation of the piezoelectric device, and this vibration has a certain frequency and amplitude.

In some highly corrosive medium environments, the tuning fork level gauge in the prior art is easily corroded by the medium, which changes the vibration signal received by the piezoelectric ceramic, so that the tuning fork level gauge is reliable when monitoring the level. The performance is reduced, and false alarms are prone to occur. However, there is a lack of monitoring of tuning fork rod corrosion in the prior art.

In response to this situation, the R&D engineers of Shenzhen Jiwei Automation Technology Co., Ltd. made improvements to the existing monitoring methods and systems on the basis of many tests, and proposed a new type of tuning fork level meter and its monitoring level The method and system include the following steps: the piezoelectric ceramic senses the vibration of the tuning fork rod and outputs the corresponding electrical signal, the processor collects the voltage amplitude of the electrical signal in real time, and judges whether the tuning fork rod is in contact with the material according to the voltage amplitude; at the same time monitoring The frequency change trend of the electrical signal, judge whether the tuning fork rod is in contact with the material according to the voltage amplitude, and judge whether the tuning fork rod is corroded according to the frequency change trend; in the state of not contacting the material, judge the degree of corrosion according to the frequency change value, when it is corroded When the degree is serious and affects the reliability of the equipment, a corrosion alarm is output.

Tuning fork level gauge and method and system for monitoring level

Practice has proved that the multiple voltage amplitudes sampled continuously are compared with the preset voltage upper limit value, voltage lower limit value and voltage median value. According to the comparison result, it is judged whether the tuning fork stick is in contact with the material. Since the sampled voltage amplitude is multiple continuous, and through multiple comparisons with the voltage upper limit value, the voltage lower limit value and the voltage median value, even if the tuning fork level meter is momentarily impacted by an external force or electrical interference, the voltage The amplitude is instantaneously unstable, and it does not affect the processor’s judgment of the use state of the tuning fork rod, and can monitor the level more accurately and reliably.

The Links:   DMF-51043NFU-FW-1 LC260W01-A5K1

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