1. Technical principles and features
Ultrasonic level meters work based on the principle of ultrasonic emission, propagation and reception.
When an ultrasonic pulse is emitted from a sensor and hits the surface of a liquid, it is reflected and the reflected wave is received by the same sensor.
By measuring the time difference from the emission to the reception of the ultrasonic wave, combined with the speed of sound, the distance from the sensor to the liquid surface can be calculated.
This technology is non-contact, wear-free and suitable for a variety of liquids.
2. Accuracy level and standard
The accuracy level of ultrasonic level meters is usually expressed as a percentage or millimeter of measurement error. Different application scenarios and needs have different requirements for accuracy. For example, some industrial applications may require an accuracy of ±1% or ±2mm.
3. Analysis of influencing factors
The measurement accuracy of ultrasonic level meters is affected by many factors, including:
• Ambient temperature: temperature changes affect the speed of sound.
• Pressure: pressure changes on the liquid surface may affect the reflection effect.
• Medium characteristics: such as liquid density, viscosity, surface tension, etc.
• Probe position: probe installation position, inclination, etc.
• Interference: such as echo from the tank wall, interference from other sound sources, etc.
4. Error sources and correction methods
Common sources of error include:
• Velocity error: can be reduced by calibrating the velocity of sound or using temperature compensation.
• Delay error: the delay between the probe and the circuit can be corrected by software or hardware.
• Nonlinearity error: due to the nonlinear relationship between the probe and the liquid, it can be compensated by software algorithms.
5. Practical application case analysis
Ultrasonic level meters are widely used in storage tanks in some chemical, pharmaceutical, food and other industries. Through the analysis of actual cases, the key factors affecting the measurement accuracy can be found and corresponding improvement measures can be proposed.
6. Accuracy Improvement Measures
To improve the measurement accuracy of ultrasonic level meters, the following measures can be taken:
• Use high-performance ultrasonic probes.
• Optimize circuit design to reduce delay errors.
• Strengthen software algorithms to improve data processing accuracy.
• Regularly calibrate and maintain to ensure the stability and accuracy of the equipment.
7. Industry Applications and Standards
In different industries, ultrasonic level meters have different application standards. For example, the petrochemical industry may require higher measurement accuracy and stability. Therefore, when selecting and using ultrasonic level meters, the standards and requirements of related industries should be considered.
8. Conclusion and Recommendations
As a non-contact liquid level measurement method, ultrasonic level meter has broad application prospects.
However, its measurement accuracy is affected by many factors and needs to be improved through technical improvements and optimization in practical applications.
It is recommended to fully consider its technical principles, accuracy requirements, influencing factors, etc. when selecting and using ultrasonic level meter to ensure its accuracy and reliability in various application scenarios.