By applying an alternating current (AC) signal with a frequency higher than 20 kHz to the transducer/sensor, the ultrasonic transducer generates minute, high-frequency mechanical vibrations, which are then converted into ultrasonic waves.
What are the advantages of ultrasonic water meters?
Compared to mechanical water meters, ultrasonic water meters offer ten key advantages:
High accuracy:
By combining electronic technology (high-frequency clocks and precision timing circuits), they can measure minute time differences with nanosecond (ns) precision, enabling accurate calculation of flow velocity and volume.
Ultrasonic water meters are far more sensitive than mechanical meters, particularly when measuring very low flow rates (even a dripping tap).
Ultrasonic water meters can detect a starting flow rate as low as 1 liter/hour, whereas mechanical meters typically start at 6–7 liters/hour. This advantage significantly reduces water loss caused by the failure to measure low-flow leakage.
Long service life:
With no mechanical components, ultrasonic water meters avoid the lifespan reduction caused by wear and tear. In contrast, mechanical meters typically have a service life of around 6–8 years due to wear.
High long-term stability and accuracy:
Mechanical meters suffer from performance degradation as their impellers and gears wear down; ultrasonic meters, having no moving parts, do not experience such degradation and thus maintain their accuracy.
Strong resistance to impurities:
The flow path in an ultrasonic water meter is unobstructed, making it resistant to clogging or jamming by impurities like sand or rust; it can operate effectively even in environments with poor water quality.
Low pressure loss:
Ultrasonic water meters feature a simple flow-path structure that offers minimal resistance to water flow, avoiding the pressure loss caused by impeller rotation found in mechanical meters.
Wide measurement range (R-ratio):
For example, a DN15 ultrasonic water meter can effectively measure flow rates ranging from 0.001 m³/h to 5 m³/h, whereas a mechanical meter is typically limited to a range of 0.004 m³/h to 3 m³/h. Fault Diagnosis and Alarms:
Capable of detecting and issuing alarms for abnormal conditions such as reverse flow, air in the pipeline, low battery voltage, sensor malfunctions, and irregularities in water temperature, pressure, or data.
Bi-directional Measurement Capability:
By comparing the transit times of upstream and downstream ultrasonic signals, the device can determine the direction of water flow and measure both forward and reverse flow.
Installation Flexibility:
Mechanical water meters are typically restricted to horizontal or vertical installation. Ultrasonic water meters can be installed horizontally, vertically, or at an angle without compromising measurement accuracy.
However, adhering to the manufacturer's installation guidelines is still necessary to ensure optimal performance.
Strong Resistance to Magnetic Interference:
Some mechanical water meters rely on magnets attached to rotating gears for metering, making them susceptible to interference from external magnetic fields.
Ultrasonic water meters operate on a different principle and are unaffected by external magnetic fields, thereby eliminating the risk of tampering with the meter reading using strong magnets.