Source: Thermal Control Circle
1. The difference between the three
In terms of working principle, the signal emitted by ultrasonic waves travels at the speed of sound, while radar travels at the speed of light, and it is obvious that radar measurement speed is better than ultrasonic, and it is the same level as laser measurement. The RF admittance is measured by the capacitance between the probes, and the RF does not emit something, but adds a group of RF RF signals on the basis of the capacitance meter, which is an upgraded version.
RF admittance level gauge
2. Similarities between the three
In terms of working principle, the digital signal collected by the sensor is converted into analog signal output, ultrasonic and radar have some similarities, both of them use air as the medium, take the measured liquid level as the measurement point, and realize the change of the measured liquid level by reflecting and receiving the reflected signal, but the radio frequency admittance is an upgraded version of the pure capacitive instrument, and there is no actual similarity between the two.
Radar level gauge
Ultrasonic level gauge
3. Summary
The three instruments have their own specialties in the selection, ultrasonic and radar are non-contact measurements, while RF admittance is contact measurement, but the RF admittance is relatively strong in anti-environmental interference and not easy to damage, while the other two instruments are relatively expensive.