Detecting device and method for inspecting the seal-tightness of sealed products

A detection device for checking a leaktightness of sealed products, comprising:

• an enclosure configured to receive at least one product that has been sealed under a nitrogen-containing atmosphere;
• a turbomolecular vacuum pump;
• an ionized gas gage;
• a buffer volume fluidically connected to a chamber of the ionized gas gage;
• an isolation valve interposed between the enclosure and the buffer volume and configured to place the buffer volume in communication with, or isolate the buffer volume from, the enclosure;
• a conductance-variable restriction interposed between an inlet of the turbomolecular vacuum pump and the buffer volume, the conductance-variable restriction having a variable opening;
• a gas injection device configured to inject a variable flow rate of replacement gas distinct from nitrogen into the enclosure containing the sealed product;
• and
• a control unit configured to control the variable opening of the conductance-variable restriction and/or the flow rate of the gas injection device in dependence on a control parameter of the ionized gas gage in order to ignite or maintain a plasma in the chamber.