It is used for dry leak detection of air-conditioning coaxial pipelines, using dry air to test the pressure strength and large leaks of the pipelines, pre-evacuating and filling helium at the cost of the collected labor, using the vacuum box method for helium mass spectrometry Air tightness test. Then the helium gas of the tested workpiece is recycled and used, and the overall leakage rate of the workpiece is judged by the equipment. 　　 performance characteristics: 　　1) Leak detection cycle: ≤30 seconds/check. 　　2) Withstand pressure test, judge the leakage pressure: ≤ 5.0 MPa; 　　3) Helium detection pressure: ≤ 2.0 MPa; 　　4) Helium recovery rate: ≥ 98%. 　　5) Detection leak rate: less than 2g/year; 　　6) Error-proofing function: Qualified stamps are ejected to prevent errors and unqualified products are mixed. 　　7) Barcode printing function: automatically print labels for qualified products. 　　8) Data storage function: the detection data is stored in a database, and an open interface is provided for the server to read and query. The storage volume of the detection data is not less than 200,000 groups, and it has a barcode scanning function; 　　9) The equipment has the function of detecting pipeline blockage;