1. Check whether the sampling probe, heating and heat preservation device, filter element, solenoid valve, and sampling pump are normal. The automatic monitoring equipment for dilution extraction method should also check whether the dilution gas supply system and dilution components are normal;

2. Check whether the air tightness of the sampling pipeline and the sampling flow meet the requirements;

3. Check whether the back-blowing system is normal, the back-blowing air source pressure should be between 0.4 MPa and 0.6 MPa, and the timing and automatic back-blowing function and solenoid valve switch action are normal;

4. Maintain the sampling system at least once every 30 days in accordance with the instructions, replace the vulnerable parts such as the filter membrane, filter element, molecular sieve, etc. according to the site conditions, clean up the sampling probe, filter, sampling pipeline, oil mist separator, flow meter, and sampling pump And other parts.