It is applied to the air-tightness detection of household air conditioners, with high accuracy, fast leak detection cycle, qualitative and quantitative display of the leakage of the workpiece, simple operation and maintenance, suitable for production lines technical parameter 　　1. Leak detection beat: 120 pieces/s for big box, 30 pieces/s for small box 　　 2. The highest inflation pressure: higher than 5Mpa 　　 3. Helium recovery rate: ≧98% 　　4. Ultimate vacuum in the vacuum box (Pa): better than 10Pa 　　 5. The minimum detectable leak rate: 0.1g/y