Semiconductor ultrapure water

02/01/1999

Semiconductor ultrapure water

The Ultrapure PPT on-line total organic carbon (TOC) analyzer offers the highest accuracy for low-level TOC monitoring of ultrapure water. With its standard delivery system, PPT can be user-calibrated, on-line. Verification of calibration, at TOC levels down to 1 ppb, can also be completed on-line, and on-line calibration of resistivity/conductivity is easy to perform. Employing membrane-conductivity technology, the system eliminates the false positives that are typical of older on-line technology. Ultrapure PPT also offers TOx indication, a new parameter for indicating changes in contaminants present in trace levels in ultrapure water systems. TOx, the principal offenders in creating false positives, are organics containing halogens, phosphorus, nitrogen, or sulfur. Monitoring TOx can indicate changing levels of THM contaminants or degrading ion-exchange resins, providing useful information for managing a water system. Sievers Instruments Inc., Boulder, CO; ph 303/444-2009, fax 303/444-9543.