Large Diameter Ultrasonic Water Meter use the time difference method of ultrasonic measurement. The flow rate is calculated by detecting the time difference of ultrasonic waves propagating in the downstream and upstream directions. There are no mechanical moving parts involved in the whole process. This design completely avoids the problem of accuracy loss or failure caused by mechanical wear of traditional mechanical water meters, thereby significantly improving long-term stability. For example, the impeller of traditional water meters is easily affected by wear or scaling of water impurities, while ultrasonic water meters do not need to physically contact the water flow, and can still maintain measurement accuracy even under water conditions with high sand content and many impurities. In addition, the design without mechanical flow obstruction elements makes the water flow channel completely unobstructed, the cross-sectional area of ​​the pipeline is not limited, and the pressure loss level can be as low as △p25 or even △p10, which is much lower than the pressure loss level of mechanical water meters.

In order to achieve low pressure loss and high stability, ultrasonic water meters use rectification structure and flow stabilization technology to optimize the internal flow field of the pipeline. For example, through the circular hole metering channel or double-section measurement design, the interference of turbulence and eddy current on the ultrasonic signal is reduced to ensure stable flow state. Some models also use dynamic zero-point tracking technology to calibrate the flow baseline in real time to eliminate drift errors caused by temperature changes or long-term use. This design not only reduces the requirements for straight pipe sections, but also improves the adaptability to complex flow fields, so that the water meter can maintain stable output when the pipe network pressure fluctuates or the water flow direction changes suddenly.

High-end ultrasonic water meters generally use dual-channel or four-channel redundant measurement technology, which greatly improves reliability through multi-channel independent detection and cross-validation of data. Even if a single channel fails due to external interference or failure, the system can still complete the measurement through the remaining channels, and automatically eliminate abnormal data with intelligent algorithms to ensure that the level 2 accuracy standard is achieved. In addition, the self-test alarm function can monitor the device status in real time, and the fault information is displayed on the LCD or uploaded to the management system remotely for timely maintenance. This dual guarantee mechanism of "hardware redundancy + software error correction" is the core technical support for achieving long-term stable operation.

The all-metal structure and IP68 protection level design of the ultrasonic water meter enable it to work stably in high temperature, high humidity, immersion and even freezing environments. For example, stainless steel can resist corrosive water and external impact, while the triple airtightness detection process and double IP68 protection design ensure that electronic components can still operate normally when immersed in water for a long time. At the same time, the combination of micro-power technology (power consumption <0.1mW) and long-life lithium batteries (theoretical life 6-16 years) further reduces the risk of downtime due to battery exhaustion.

The wide range ratio (up to R1000) and low starting flow (as low as 0.001m³/h) of ultrasonic water meters enable them to accurately measure small flows (such as dripping) and cope with large flow scenarios, avoiding the "unmetered" blind spot of traditional water meters at low flows. In addition, the feature of no moving parts reduces maintenance requirements. Some models support NFC near-field communication or remote firmware upgrades, and parameter settings or fault diagnosis can be completed without disassembly, greatly reducing operation and maintenance costs