1, The first is the comparison method
The comparison method uses a standard table (mother table) and a checked table to be linked together. Through a certain pressure of water, various tests are carried out according to the regulations. At this time, the two table hands move together and the water meter pointer is verified. When the indicated index line and the index line indicated by the standard table pointer are consistent, it indicates that the water value to be verified is correct, otherwise the test needs to be repeated until it is correct.
2, the second is the volume method
The volume method is to align the minimum pointer of the water meter to the “0” position or a certain index line, and place the standard volume of water to the “0” position (empty pair “0”), and then manipulate the rotameter to adjust the valve to make the water The flow rate passes through the water meter according to the specified flow value and enters the standard container. When the water meter pointer reaches the pre-specified index or the standard container water surface reaches the predetermined index, the rotor flow meter valve is closed, and the water surface in the standard container is calmed. Then read the reading, when the index value indicated by the water meter pointer and the volume value shown in the standard container are consistent, indicating that the water meter value is correct. In this way, the indication value of the water meter is verified, called the volume. law.
The above two methods, the first method: checking the quality is unstable, the two methods are safe, reliable and reliable, but the inspection efficiency needs to be improved.
