Leak detector

A leak detector including at least one analysis unit connected to the inlet of a first secondary pump, a pre-evacuation set connected to an inlet coupling, the inlet of said pre-evacuation set further being connected to the outlet of said first secondary pump via a pipe provided with a first valve, wherein said pre-evacuation set comprises a second secondary pump and a mechanical primary pump connected together in series, and wherein a pipe provided with a second valve connects an intermediate point of said first secondary pump to the inlet of said secondary pump, wherein said first secondary pump and said secondary pump are hybrid pumps, each of which comprises two portions:

• a first portion, at the inlet end, of the turbomolecular blade type, and a second portion, at the outlet end, of the Holweck type.