Ultrasonic level instruments operate on the basic principle of using sound waves to determine liquid/ solid/slurries level. In addition to standard level or volume measurement, they can monitor open channel flow, determine the actual volumetric throughput in lift stations, measure differential level and control the pumps.
Minimum measuring distance (Xm): (also known as the "Dead Band") is a feature common to all ultrasonic level meters. This is a short range in front of the sensor within which the ultrasonic device can not measure.
Maximum measuring distance (XM): The longest range under ideal condition within which the device can measure. No measurement is possible beyond this distance.