METHOD OF CHECKING TIGHTNESS OF ARTICLES Russian patent published in 1995 - IPC

FIELD: testing engineering. SUBSTANCE: large object 2 is received in evacuated chamber 1. Changing of concentration of checking gas, which is due to presence of article 3 inside the large-sized object, is measured inside the vacuum chamber. Checking gas is fed from checking leakage 9 to the article position on the large object. One sets changing of concentration of checking gas due to the checking leakage to be equal to the changing of the concentration of checking gas due to the presence of the article. The flow rate of the checking leakage is measured and used for defining extent of tightness of the article. EFFECT: enhanced reliability. 1 dwg