How to select IoT water meters? How to apply them in leakage control?
1. Types and technical features of water meters
The national standard "Drinking Cold Water Meter and Hot Water Meter" divides water meters into two categories, namely: mechanical water meters and electronic water meters. Mechanical water meters are mainly composed of traditional velocity water meters and volumetric water meters. Typical velocity water meters include rotary vane water meters and propeller water meters, while electronic water meters mainly include electromagnetic water meters and ultrasonic water meters.
The rotor water meter is the most commonly used type of velocity water meter. It is widely used in China for its simple structure, stable measurement and low price. Its main application scenario is in small-diameter pipe networks, such as household meters.
Propeller water meter, which is also a velocity water meter, can be divided into horizontal propeller type and vertical propeller type. Compared with the rotor type water meter, the propeller type water meter has an axial water inlet and axial water outlet structure. The water flow state is relatively stable, the pressure loss is small, and the flow capacity is large. It is suitable for use in large-diameter pipelines.
Volumetric water meter adopts the measuring principle of rotary piston. Compared with the rotary vane water meter, it has a wider measuring range, with a range ratio of more than R160; high sensitivity, small starting flow; no restrictions on the installation position, and can be installed horizontally, vertically or tilted without affecting the measurement accuracy. Compared with the velocity water meter that directly obtains its power speed from the water flow speed, the biggest advantage of the volumetric water meter is that it will not cause the water meter to rotate due to the influence of water pressure fluctuations in the pipeline. Currently, most electronic water meters are large-diameter water meters, mainly electromagnetic water meters and ultrasonic water meters.
