What Are the Differences Between Ultrasonic and Radar Level Meters?
We always have various questions when selecting level meters. What are the differences between radar level meters and ultrasonic radar level meters? Where exactly do the differences lie? What are the differences in their application conditions, and what are their measurement principles? How do their accuracies differ? What exactly are the measurement principles of these two types? Let's explore these two different level meters together.
Radar Level Meter
Ultrasonic Level Meter
The radar level meter operates in a transmit-reflect-receive mode. Its antenna emits electromagnetic waves, which are reflected by the surface of the measured object and then received back by the antenna. The time from emission to reception of the electromagnetic wave is proportional to the distance to the liquid surface. The relationship is as follows:
D=CT/2
Where D — Distance from the radar level meter to the liquid surface
C — Speed of light
T — Travel time of the electromagnetic wave
The radar level meter we refer to records the time elapsed by the pulse wave. Since the transmission speed of electromagnetic waves is constant, the distance from the liquid surface to the radar antenna can be calculated, thereby determining the liquid level.
The radar level meter we commonly refer to uses electromagnetic waves as its principle, while the ultrasonic level meter uses sound waves. The penetration capability of ultrasonic level meters is much stronger than that of radar. This is the biggest difference between the two types of level meters.
What are the differences between them in practical use:
1. Ultrasonic level meters have a much smaller measurement range than radar level meters.
2. Radar level meters can be applied in conditions such as vacuum, foam on the liquid surface, or excessive steam content, while ultrasonic level meters cannot.
3. When using ultrasonic level meters, there is no need to consider the dielectric constant of the medium, whereas radar level meters require this consideration.
4. Ultrasonic level meters are much cheaper than radar level meters.
5. The accuracy of ultrasonic level meters is much lower than that of radar level meters.
6. Ultrasonic level meters can be applied in more complex environments, while radar level meters cannot.
In summary, when selecting between radar level meters and ultrasonic level meters, we should make the choice based on the on-site industrial control environment to select the suitable level meter.
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