1.
radar level transmitter and ultrasonic level gauge have different measurement principles and lead to different application environments.
The radar level transmitter is based on the dielectric constant of the measured medium.
Ultrasonic level gauges are based on the density of the measured medium.

2.
Ultrasonic level gauges are generally used only in atmospheric vessels.
Radar can be used in high pressure process tanks.
Non-contact radars are not recommended for small containers or elongated containers. Guided wave radars are generally recommended.

3.
The accuracy of radar level gauge is higher than ultrasonic level gauge.
High-precision radar level gauge should be selected in tank measurement.

4.
The transmission of sound waves requires media, so it cannot be transmitted in a vacuum. Therefore, the limitations of ultrasound in practical applications are still very large, and there are many disadvantages compared with radar.
First of all, the ultrasonic level meter has a temperature limit, generally the temperature at the probe cannot exceed 80 degrees, and the speed of the sound wave is greatly influenced by the temperature.
Secondly, ultrasonic level gauges are greatly influenced by pressure. Generally, less than 0.3 MPa is required because sound waves are emitted by vibration. When the pressure is too high, the sound components will be affected.
Third, when the measurement environment has a large amount of fog or dust, it will not be measured very well.

All these limits the application of ultrasonic level gauges.

In contrast, radar is an electromagnetic wave that is not affected by the degree of vacuum. The application range of medium temperature and pressure is very wide. With the advent of high-frequency radar, its application range is more extensive, so in the level measurement, Radar is a very good choice.

5. Installation Notes for Ultrasonic Level Gauge and Radar Level Gauge

Whether it is a radar level gauge or an ultrasonic level gauge, it is necessary to pay attention to the installation position during installation and pay attention to the blind area.

For example when installing on a tank:
Do not install in the feed inlet
Do not install near people ladders.
Keep a distance of 300 to 500 mm from the tank wall to prevent echo interference.
When stirring, the liquid level fluctuations should also choose the appropriate installation method.

6. Summary

Summarizing the above, the following points can be drawn:
1. The radar level transmitter measurement range is much larger than ultrasound.
2. Radar has horn type, rod type, cable type, and relative ultrasonic can be applied to more complicated working conditions.
3. Ultrasonic accuracy is not as good as radar.
4. The price of radar is higher.
5. When using radar, consider the dielectric constant of the medium.
6. Ultrasonic level meter can not be applied to vacuum, steam content is too high or liquid surface foam and other conditions.