초록 ▼

For leak testing closed containers (9) which are filled with a filling product containing at least one liquid component the container is introduced in a test cavity (1) which is evacuated at least down to vapour pressure of that liquid component. The pressure in the surrounding of the container (9)

For leak testing closed containers (9) which are filled with a filling product containing at least one liquid component the container is introduced in a test cavity (1) which is evacuated at least down to vapour pressure of that liquid component. The pressure in the surrounding of the container (9) and thus within test cavity (1) is monitored. Monitoring is performed by a vacuum pressure sensor (7), whereas lowering pressure surrounding the container (9) is performed by a vacuum pump (5). Leakage is detected by monitoring a pressure change in the surrounding of the container which is due to evaporation of liquid emerging from a leak and being evaporated in the low pressure surrounding.

대표청구항 ▼

[ I claim:] [1.] A method for leak testing at least one closed and filled container, whereby the content of said container comprises at least one liquid component, comprising the steps of:applying a pressure difference across at least a part of the wall of the container which part is to be tested by

[ I claim:] [1.] A method for leak testing at least one closed and filled container, whereby the content of said container comprises at least one liquid component, comprising the steps of:applying a pressure difference across at least a part of the wall of the container which part is to be tested by evacuating the surrounding of said container by means of a pumping arrangement;lowering said pressure in said surrounding to a value at least according to vapour pressure of said at least one liquid component;monitoring the pressure in said surrounding as a leak indicative signal, thereby performing evacuation of said surrounding by said pumping arrangement at least substantially up to monitoring said pressure as a leak indicative signal.