About Ultrasonic Level Measurement
Ultrasonic measurement is a proven and cost-effective level measurement solution for liquids and bulk solids. It uses sound waves to determine the distance between the sensor and a target surface, such as a liquid or solid in a container.
Ultrasonic level measurement enables continuous, non-contact, and maintenance-free level measurement. It can measure a wide range of materials. Including liquids, pastes, sludges, and granular materials. It is a reliable, cost-effective, and versatile method of level measurement.
What is An Ultrasonic Level Transmitter?
Ultrasonic level transmitter is a device that uses sound waves to measure the level of liquid or solid materials. It is a continuous level measurement device. It can provide real-time, non-contact measurement. It is widely used in industry, agriculture, commerce and other fields.
Advantages of Ultrasonic Level Transmitters:
Non-contact measurement: This allows use in harsh environments or with corrosive liquids without direct contact.
Versatility: They can be used to measure liquid levels in a variety of applications. Including tanks, reservoirs, and open channels.
Accuracy: Ultrasonic technology provides accurate and reliable level measurement. Especially when temperature compensated.
In summary, ultrasonic level transmitters provide a versatile and reliable solution for level measurement in a variety of industrial and environmental applications， due to their non-contact measurement capabilities and ability to handle a variety of liquids and environments.
Working Principle of Ultrasonic Level Sensor
Ultrasonic level sensors work by transmitting a high-frequency sound pulse and measuring the time it takes for the pulse to return after bouncing off a surface. This time difference is then converted into a level reading. The core calculation involves the speed of sound and the time of flight of the ultrasonic pulse.
Here is a more detailed explanation of how it works:
1. Ultrasonic pulse: The transmitter sends a high-frequency sound wave to the surface of the material being measured.
2. Reflection: The pulse passes through an air gap and reflects off a liquid or solid surface.
3. Time of flight: The sensor measures the time it takes for the reflected pulse to return.
4. Distance calculation: The time of flight is converted to a distance measurement. This distance is then used to calculate the level.
5. Level measurement: This distance, along with the tank dimensions, is used to determine the level.
The calculation formula for determining liquid level using an ultrasonic level transmitter is: L = E – D
• L: the measured liquid level.
• E: the empty tank distance (the distance from the sensor to the tank bottom).
• D: the distance measured from the sensor to the liquid surface (calculated using the above formula).
Distance is calculated using the following formula: D = (c * t) / 2 , where:
• Distance (D) :the distance between the sensor and the liquid surface.
• Speed of sound (c) :the speed of an ultrasonic pulse in a medium (such as air).
• Time (t) : the time it takes for the pulse to reach the liquid surface and return.
Examples:
•Speed of sound: Assume that the speed of sound in air is 343 m/s.
•Time of flight: The time required for the pulse to travel to the liquid surface and back is 0.005 seconds.
•Distance: Distance = (343 m/s*0.005 sec)/2 = 0.86 m.
•Level: If the empty tank distance (E) is 2 m, the liquid level (Level) is 2-0.86 = 1.14 m.
Applications of Ultrasonic Level Transmitter
Ultrasonic level transmitters are widely used in a variety of applications across multiple industries. They are used to monitor and control liquid levels in tanks, silos and other storage vessels. They can measure a variety of materials. Including liquids, pastes, sludge and granular materials.
- Chemical industry
- Oil and gas industry
- Food and beverage production
- Water and wastewater treatment
- Pharmaceutical industry Environmental monitoring
- Agricultural irrigation
- Mining and power generation
Difference Between Transmitter and Sensor
Sensors and transmitters are two different components. Although transmitters and sensors are often used together, they have different functions and roles:
Main Difference | Sensor | Transmitter |
Function | Detect and measure physical parameters and convert them into raw signals. | Receive and process raw signals from sensors. |
Signal Output | Converts these parameters into a raw signal, which can be voltage, current or resistance. | Converts the raw signal into a standardized electrical output. Typically, 4-20 mA or a digital signal. |
Communication | Not suitable for direct long-distance communication. | Designed for long-distance communication. |
Location | Usually directly at the point of measurement. | It may be located some distance from the sensor. |
Complexity | Sensors are usually simpler and smaller and more compact. They only need to detect and respond to inputs, not transmit signals. | Transmitters are usually larger and more complex. This is because they need to generate a signal and transmit it over long distances. |
Applications | Real-time monitoring and measurement of liquid or solid levels. | Integration into automation systems for level monitoring and control. |
How to Use Ultrasonic Level Transmitter?
- Installation: Install the transmitter on the container. Avoid obstacles, vibrations, and other factors that affect the measurement. Make sure it is unobstructed and can contact the liquid smoothly.
- Power supply: Connect the transmitter to a suitable DC power supply and ensure that the correct voltage is provided.
- Signal connection: Connect the transmitter to the control system through a standard signal such as 4-20mA.
- Setting of operating parameters: Set the operating parameters of the transmitter according to the specific application and accuracy.
- Calibration: Calibrate the transmitter before use. Including setting the empty distance and span.
- Temperature compensation: The speed of sound changes with temperature. It may affect the measurement accuracy.
- Testing: Test the performance and accuracy of the transmitter by simulating or actual liquid level changes.
- Maintenance: Clean the sensor surface regularly and check the connection. And monitor the performance of the ultrasonic level transmitter.
- Interference: Pay attention to potential interference caused by factors such as wind, vibration, and temperature changes.
Advantages of Ultrasonic Level Sensor
- Non-contact, non-invasive measurement
- Wide range of applications
- High reliability and durability
- Precise measurement
- Multiple measurement options
- Long-distance measurement
- Suitable for hazardous materials
- Not affected by color or transparency
Limitations of Ultrasonic Level Sensor
Susceptible to obstructions, foam, and other environmental factors: Bubbles or foam in the liquid may affect the propagation of ultrasonic waves. This can affect its accuracy and response time.- Media restrictions: Some transmitters may not be suitable for specific media. For example, highly abrasive or corrosive liquids.
- Limited measurement range: There may be a dead zone near the sensor. Accurate measurements may not be possible.
- Installation requirements: The installation location needs to consider avoiding obstacles. Proper installation and maintenance can be complex and costly. Especially in hazardous areas.
- Cost considerations: Although generally cost-effective, some ultrasonic sensors can be more expensive than other level sensing technologies.
Ultrasonic level sensors play an important role in industrial automation due to their reliability, accuracy and versatility. Their non-contact design and ability to measure in a variety of environments make them a popular choice for various level measurement applications. They provide a reliable means of level monitoring and control for all industries.
Sino-Inst is a professional supplier in the water treatment industry. We provide a variety of water level measurement equipment. Including ultrasonic flow meters, radar level gauges, pressure transmitters, etc. If you have any questions or needs, please contact our team. We will tailor a solution for you.
