It has good heat dissipation performance and can accommodate SO2, NO2, CO, O3, PM2.5, PM10 analyzer, zero gas generator, calibrator, data acquisition instrument and other instruments. The cabinet uses aviation grade guide rail to pull and connect the loading instrument, which is convenient for disassembling the instrument and cleaning the internal pipeline of the instrument. There is a longitudinal guide rail at the back of the cabinet to summarize the cable lines of each instrument. The cabinet has grounding hole lines. All connecting pipelines, joints, etc. are made of anti-corrosion materials, No chemical reaction with the tested pollutant.