Measurement of water flow in fully charged closed conduits.Meters for cold potable water and got water.Part 3:Test methods and equipment

2Scope / Description

This part of GB/T 778 specifies the test methods and test equipment for determining the main characteristics of water meters The water meter of 500 is O.6 MPa (6 bar), the maximum allowable working temperature (MAT) of the drinking cold water meter is 30 ℃, and the hot water meter can reach a maximum of 180 ℃ according to the level of various drinking cold water meters and hot water meters GB/T778 This standard also applies to water meters based on electrical or electronic principles and based on mechanical principles with electronic devices for measuring the actual volumetric flow of cold and hot water for drinking. For water meters with a common flow rate of less than 160 m/h, when doing durability tests or performance tests under various influence quantities, in order to adapt to the conditions of each test laboratory, the test program can make provisions for modifying the reference conditions Note: If national regulations are involved, the national regulations are higher than the provisions of this part of GB/T778