What is an ultrasonic level transmitter?
Introduction
In various industries, the accurate measurement of liquid and solid levels is imperative for efficient and safe operations. The ultrasonic level transmitter is a widely used technology for level measurement in tanks, vessels, and silos. It is a non-contact level measurement device that uses ultrasonic sound waves to detect and measure the level of the material in the tank, vessel or silo. In this article, we will discuss what an ultrasonic level transmitter is, how it works, its advantages, and limitations.
What is an ultrasonic level transmitter?
An ultrasonic level transmitter is a device that uses ultrasonic sound waves to measure the level of liquid or solid in a tank, vessel, or silo. It is a non-contact method of level measurement, which means that it does not come in direct contact with the material being measured. The transmitter sends out high-frequency sound waves which bounce off the surface of the liquid or solid in the tank and return to the transmitter. The time taken for the sound waves to bounce back is measured, and this measurement is used to calculate the level of the material in the tank.
How does an ultrasonic level transmitter work?
An ultrasonic level transmitter works based on the principle of sound waves. The transmitter sends out a high-frequency sound wave, usually between 25 kHz to 200 kHz, which travels through the air. The sound wave hits the surface of the material, and a portion of the wave is reflected back to the transmitter.
The transmitter measures the time between when the sound wave was sent out and when it was received after being reflected back. This time is called the ultrasonic transit time. The transmitter then converts the ultrasonic transit time into a distance measurement. This distance measurement indicates the level of material in the tank, vessel or silo.
The transmitter sends out sound waves at regular intervals to measure the level continuously. The accuracy of the measurement depends on the frequency of the sound waves, the distance between the transmitter and the material surface, and the properties of the material such as density, reflectivity, and surface condition.
What are the advantages of ultrasonic level transmitters?
1. Non-contact measurement: The ultrasonic level transmitter measures the level of liquid or solid without coming into direct contact with it. This makes it suitable for applications where the material being measured is corrosive, hazardous or in motion.
2. High accuracy: Ultrasonic level transmitters are highly accurate and can measure the level of material to within 0.25% of the total range of the sensor.
3. Easy installation: Ultrasonic level transmitters are easy to install and do not require any drilling or cutting of the tank or vessel. They can be mounted on top of the tank or vessel using a bracket.
4. Suitable for various applications: Ultrasonic level transmitters are suitable for measurement of liquids, powders, granules, and solids.
5. Cost-effective: Ultrasonic level transmitters are relatively cheap compared to other types of level measurement technologies.
What are the limitations of ultrasonic level transmitters?
1. Limited distance: Ultrasonic level transmitters have a limited range of measurement. The maximum range is typically 60 feet (18 meters).
2. Affected by environmental factors: Ultrasonic level transmitters can be affected by environmental factors such as temperature, humidity, wind, and air movements, which can cause false readings.
3. Surface condition of the material: The accuracy of the measurement can be affected by the surface condition of the material being measured. Rough surfaces can cause sound waves to scatter and can lead to inaccurate readings.
4. Not suitable for foamy or bubbly liquids: Ultrasonic level transmitters are not suitable for measuring foamy or bubbly liquids as the air bubbles can cause the sound waves to reflect back improperly.
Conclusion
In summary, an ultrasonic level transmitter is a non-contact, highly accurate level measurement device that uses sound waves to measure the level of liquids, powders, granules, and solids in tanks, vessels, and silos. Although they have certain limitations, they are considered to be cost-effective and easy to install, making them a favored choice in level measurement.