EG&G Inc. plans to acquire Perkin-Elmer's Analytical Instruments Div. for $425 million. The acquisition should enable EG&G to bolster its existing instruments and life sciences units. The Perkin-Elmer division produces systems that help to ensure product uniformity in drugs and medicines, protect the environment and test the structural integrity of materials. The division employs 3100 people and posted sales of $569 million for 1998. The move is the latest in a series of acquisitions and divestitures by EG&G. Recently, the company completed a $250 million acquisition of Lumen Technologies and purchased Life Science Resources Ltd.