How the system working

Use a volumetric tube to calibrate the flowmeter. In order to accurately reflect the repeatability of the meter at each flow point, according to the national standard GB/T13282, the basic volume of the volumetric tube should be selected according to the following principles: 

In the formula: VQ——basic volume design value (m 3 ); Qmax——upper limit value of the tested flowmeter (m 3 /h);like below

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As long as this principle is met, the running speed of the elastic ball can be guaranteed to be less than 3 m/s, and the more economical running is within the safe speed range.

In order to ensure the reliability of the calibration, before the official calibration, the tightness test of the volume tube system should be carried out: first conduct the test process, and then the control system starts the booster pump to pressurize the volume tube system to maintain the pressure in the volume tube If the pressure before the inlet valve is 0.5 MPa, observe for 30 minutes. If the pressure drop is less than 0.2 MPa, calibration can be carried out.

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Vivi (sh_plc@163.com).