A protective pressure-resistant enclosure, or housing is provided, which can be incorporated into a production assembly within a wellbore. A conductor associated with the monitoring system is passed through a bulkhead using a hermetically sealed arrangement wherein fluid cannot pass between the conductor and the bulkhead. In a currently preferred embodiment, the sealed arrangement includes a conductor fitting which surrounds the conductor and forms a first fluid seal between the conductor fitting and the bulkhead. A compression member is then affixed to the conductor fitting. A pair of nested ferrules are disposed between the conductor fitting and the compression member. When the conductor fitting and the compression member are secured to one another, the ferrules are compressed together to form an active fluid seal against the conductor.