1. The china magnetic flow meter products shall select the corresponding water pump according to the pipeline diameter and flow size for verification test;
2. If the system adopts compressed air power, start the air compressor to reach the air source pressure required by the system, so as to ensure the rapid switching of commutator and the normal operation of meter clamp;
3. After the china magnetic flow meter products are correctly installed and connected, it shall be powered on and preheated for about 30min according to the requirements of the verification regulation;
4. If the high-level tank water source is used, check whether the overflow signal of the stabilized pressure water tower appears. Before the formal test, the verification medium shall be circulated in the pipeline system for a certain time according to the requirements of the verification regulation, and the sealing parts in the pipeline shall be checked for leakage at the same time;
5. Before the formal verification, the verification medium shall be filled with the tested china magnetic flow meter products sensor, and then the downstream valve shall be shut off for zero adjustment;
6. When starting the verification, first open the valve at the front of the pipeline and slowly open the valve behind the verified flowmeter to adjust the flow at the verification point.
7. In the process of calibrating china magnetic flow meter products, the flow stability of each flow point should be within 1% ~ 2% - flow method, while the total amount method can be within 5%. When completing the verification process of one flow point, the temperature change of the verification medium shall not exceed 1 ℃, and when completing the whole verification process, it shall not exceed 5 ℃. The pressure downstream of the tested electromagnetic flowmeter shall be high enough to ensure that there is no flash and cavitation in the flow pipeline (especially in the short diameter reduction);
8. After each test, the valve at the front end of the test pipeline shall be closed first, and then the pump shall be stopped to avoid venting the pressure stabilizing facilities. At the same time, the remaining verification medium in the test pipeline must be emptied, and then the control system and air compressor must be closed.
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