**Exhibit 31.2**CERTIFICATION OF CHIEF FINANCIAL OFFICERI, Craig A. McCollam, certify that:1. I have reviewed this Annual Report on Form 10-Q of Dionex Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact oromit to state a material factnecessary to make the statements made, in light of the circumstances under which suchstatements were made,not misleading with respect to the period covered by this report. 3. Based on my knowledge, the financial statements, and other financial information included inthis report, fairly present inall material respects the financial condition, results of operations and cash flows of theregistrant as of, and for, the periodspresented in this report; 4. The registrant’s other certifying officer(s) and I are responsible for establishing andmaintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal controlover financial reporting (asdefined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: (a) Designed such disclosure controls and procedures, or caused such disclosure controlsand procedures to be designedunder the Company’s supervision, to ensure that material information relating to theregistrant, includingits consolidated subsidiaries, is made known to us by others within those entities,particularly during the periodin which this report is being prepared;  (b) Designed such internal control over financial reporting, or caused such internal controlover financial reporting to bedesigned under the Company’s supervision, to provide reasonable assurance regarding thereliability of financialreporting and the preparation of financial statements for external purposes in accordancewith generally acceptedaccounting principles;  (c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures andpresented in this report theCompany’s conclusions about the effectiveness of the disclosure controls and procedures, asof the end of the periodcovered by this report based on such evaluation; and  (d) Disclosed in this report any change in the registrant’s internal control over financialreporting that occurred duringthe registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter inthe case of an annual report)that has materially affected, or is reasonably likely to materially effect, theregistrant’s internal controlover financial reporting; and5. The registrant’s other certifying officer(s) and I have disclosed, based on the Company’s mostrecent evaluation of internalcontrol over financial reporting, to the registrant’s auditors and the audit committee ofregistrant’s board of directors (orpersons performing the equivalent functions): (a) All significant deficiencies and material weaknesses in the design or operation of internalcontrol over financialreporting which are reasonably likely to adversely affect the registrant’s ability torecord, process, summarize andreport financial information; and  (b) Any fraud, whether or not material, that involves management or other employees who have asignificant role inthe registrant’s internal control over financial reporting.Date: November 9, 2005   /s/ Craig A. McCollam     Craig A. McCollam  Vice President and Chief Financial Officer