Exhibit 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statements Nos. 333-83444, 333-93473, 33-12399, 33-40796, 33-78584 and 33-65081 of Dionex Corporation on Form S-8 of our reports dated July 29, 2003, appearing in this Annual Report on Form 10-K of Dionex Corporation for the year ended June 30, 2003. DELOITTE & TOUCHE LLP San Jose, California September 18, 2003