Ametek, Paoli, Pa., acquired Instruments for Research and Applied Science (IRAS), Oak Ridge, Tenn., from PerkinElmer Inc., for approximately $63 million. IRAS manufactures and markets analytical instrumentation used in applications such as nuclear spectroscopy, research electrochemistry and electronic signal processing. It has 275 employees. Ametek also purchased PerkinElmer's 49% ownership position in Seiko EG&G, a joint venture that serves as the exclusive distributor of IRAS products in Japan.