Accuracy class and application of residential water meter
Residential water meter refers to the water meter installed in the user's home or outdoors to measure domestic water. Its diameter is DN15~DN25, also known as small-diameter water meter. The quality and accuracy level of residential water meters are not concerned. Now, with the development of metering and charging for one household and one meter, in order to reduce the production and sales gap of tap water, the water supply department will prevent bad users from using dripping water to make the water meter inaccurate under small flow, etc. phenomenon, and water meters with higher accuracy levels are being gradually adopted.
For domestic users, the water meter was only a reference for the allocation of water charges in the past. Some backward places did not even have water meters. The United Kingdom also began to install water meters on a large scale in the late 1980s. Before that, it was based on the number of people. Estimate water bills. Now, rising water prices, sewage charges and per capita water consumption make household users pay more and more attention to water meters.
Therefore, the use of residential water meters with higher precision and accurate measurement is the need of social development, which ensures the fairness and justice of metering and charging, and protects the interests of both water supply companies and household users.
At present, there are four levels of accuracy of residential water meters: A, B, C, and D. A is the lowest and D is the highest. No matter what level of water meter, the common flow and overload flow of a water meter of the same caliber are the same, and the maximum allowable error All follow: the maximum allowable error is about 5% from the minimum flow rate to the low zone without the boundary flow rate, and the maximum allowable error from the boundary flow rate to the high zone is about 2%. However, the measurement characteristics of water meters of different accuracy levels are different. In short, water meters with different accuracy levels have different measurement ranges.