1. Turn off all power switches, including nitrogen generators and nitrogen inlet valves and sampling valves, waiting for the system and piping to completely depressurize. Adjust the oxygen analyzer to sample and adjust the pressure of the pressure reducing valve to 1.0 bar, adjust the sampling flowmeter, and adjust the gas volume to about 1 or so. Note that the sampling gas volume should not be too large and start to check the nitrogen purity.
2. After the compressed air pressure is above 0.7mpa, the shut-off valve of the nitrogen generator can be opened. At the same time, it is necessary to observe the pressure change of the adsorption tank and whether the operation of the pneumatic valve can be carried out normally.