Grandon Technology Limited is a company that professional to R&D,manucture and trade electrical equipments and components of Switchgear Panel upto 40.5KV. We has a top-ranking R&D team, a complete set of advanced research and development testing equipments, a set of modern management system. By now, we have established long-term cooperation with several famous universities. And has been successfully completed a number of scientific research cooperation projects, in which more than tens of national patents have been put in use of our products.
| Dry
  leak detection is carried out on the switch cabinet box through the helium
  leak detector, and the workpiece and the vacuum box are evacuated
  synchronously, so that the pressure difference between the inside and outside
  of the workpiece is not more than 0.04Mpa, the tested workpiece is filled
  with helium, and the vacuum box method is used to detect the tightness of helium
  mass spectrometry, so as to ensure that the annual air leakage rate of the
  product is less than 0.1%.  |