Device and process for determining the size of a leak hole in a sample

A device for testing a sample via a gas stream, comprising:

• an opening,
• means for generating a gas stream in the device along at least one flow path passing through the opening,
• at least one pressure sensor, each pressure sensor configured to measure a pressure of the gas stream along at least one flow path, and
• a mass flowmeter configured to measure a parameter representing the mass flow rate of the gas stream along each flow path,
• the at least one flow path comprises an exhaust path terminating at the opening,
• the means for generating the gas stream being configured to exhaust a leakage gas along the exhaust path,
• the at least one pressure sensor comprises an exhaust pressure sensor configured to measure a pressure of the leakage gas along the exhaust path,
• the mass flowmeter configured to measure a parameter representing the mass flow rate of the leakage gas along the exhaust path, and
• calculation means configured to determine the size of a leak hole, based on a measurement of the parameter representing the mass flow rate along the exhaust path.