Tuning fork level switch is widely used in petrochemical, metallurgy, light industry, building materials, environmental protection and other industries, the liquid level of the upper and lower limit alarm and control. It vibrates the tuning fork at a certain resonant frequency through a pair of piezoelectric crystals mounted on the tuning fork base. When the tuning fork is in contact with the measured medium, the frequency and amplitude of the tuning fork will change. These changes will be detected and processed by the intelligent circuit and converted into a switching signal to achieve alarm or control purposes.
formula:
t: the thickness of the fork (in m)
L: the length of the fork (in m)
E: Young's modulus (in kgf/m2)
Ï: Density of fork material (kg/m3)
g: Gravity acceleration (980cm/s2)
It can be seen from the formula that the method of adjusting the nominal frequency of the tuning fork can be achieved by adjusting the thickness and length of the tuning fork and changing the material of the fork. The vibration frequency is inversely proportional to the square of the fork length. The longer the fork length, the lower the frequency; and the proportional to the fork thickness, the thinner the fork, the lower the vibration frequency.
The random vibration frequency of working environment is generally 0~800HZ. If the frequency of the tuning fork level switch is very likely to generate resonance in the above range, it will be interfered and the measurement work will be unreliable.
At present, there are many manufacturers of tuning fork level switch most of them can measure both liquid and solid, this solid-liquid dual-use product is usually achieved by sacrificing part of the media density, and its tuning fork liquid level The frequency value of the switch is usually 600~800HZ, which will inevitably lead to a narrow range of application of the product, poor adaptability, and low reliability, and will be ineffective for some special applications.
The reasons for the unreliability of some domestic tuning fork level switches have been compared and analyzed in the above paragraphs. We hope that we can help to buy more reliable and reliable tuning fork level switches. For more information on level switch and level switch For more information on level measuring instruments such as magnetic level gauges, please pay attention to WeChat public number: Jiweimeter. (The article is taken from:, please indicate the source.)
We know that the tuning fork vibration frequency is calculated as:
formula:
t: the thickness of the fork (in m)
L: the length of the fork (in m)
E: Young's modulus (in kgf/m2)
Ï: Density of fork material (kg/m3)
g: Gravity acceleration (980cm/s2)
It can be seen from the formula that the method of adjusting the nominal frequency of the tuning fork can be achieved by adjusting the thickness and length of the tuning fork and changing the material of the fork. The vibration frequency is inversely proportional to the square of the fork length. The longer the fork length, the lower the frequency; and the proportional to the fork thickness, the thinner the fork, the lower the vibration frequency.
The random vibration frequency of working environment is generally 0~800HZ. If the frequency of the tuning fork level switch is very likely to generate resonance in the above range, it will be interfered and the measurement work will be unreliable.
At present, there are many manufacturers of tuning fork level switch most of them can measure both liquid and solid, this solid-liquid dual-use product is usually achieved by sacrificing part of the media density, and its tuning fork liquid level The frequency value of the switch is usually 600~800HZ, which will inevitably lead to a narrow range of application of the product, poor adaptability, and low reliability, and will be ineffective for some special applications.
Tuning fork level switch detectable minimum density comparison table
Counted as Ring-11 tuning fork level switch
The research and development engineer of Shenzhen Jiwei Automation Technology Co., Ltd., through a large number of experimental verifications, designed a tuning fork liquid level switch dedicated to liquid measurement based on the design principle of detecting the vibration frequency change when the fork body is immersed in the medium. The tuning fork frequency is designed to be around 1200 Hz. The liquid level is detected by the change of the vibration frequency when the fork body contacts the medium. Not only is it suitable for level measurement in vessels, tanks, and tanks, but it is also suitable for complex measurement situations with bubbles, bubbles, viscous liquids and vibration disturbances. The lowest density of the measurable liquid is 0.5g/cm3. This makes the tuning fork level switch able to be stable and reliable in wider and more complex operating conditions. Count Fork-11 Tuning Fork Level Switch
In addition, the research and development engineer of Shenzhen Jiwei Automation Technology Co., Ltd. has also developed a tuning fork level switch dedicated to the solid material level, which is based on the design principle of detecting the vibration amplitude variation when the fork body contacts the medium, and the vibration when the fork body contacts the medium. The change in amplitude to detect the material level. The measurable minimum material density is up to 0.008g/cm3, which is especially suitable for ultra-low density material level measurement, with wide adaptability and high reliability. Comparing with world-class brands, the quality and performance of the Fork-11 tuning fork level switch are comparable to those of imported brands. The reasons for the unreliability of some domestic tuning fork level switches have been compared and analyzed in the above paragraphs. We hope that we can help to buy more reliable and reliable tuning fork level switches. For more information on level switch and level switch For more information on level measuring instruments such as magnetic level gauges, please pay attention to WeChat public number: Jiweimeter. (The article is taken from:, please indicate the source.)
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