EXHIBIT 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated February 15, 2002 relating to the financial statements, which appears in O.I. Corporation's Annual Report on Form 10-K for the year ended December 31, 2001. /s/ PricewaterhouseCoopers LLP PricewaterhouseCoopers LLP Houston, Texas June 18, 2003