This Shimadzu On-line TOC-VCSH analyzer combination features the addition of continuous measurement capabilities that enable the unit to provide continuous high sensitivity measurements of organic substances contained in water. With its operating temperature of 680 degrees C, the unit is able to oxidize even the most insoluble organic compounds. Virtually any organic substance can be analyzed in the absence of potentially interfering properties such as conductivity properties or excessive pH levels. There is no need for oxidizing reagents, and therefore no need to expend time and effort in preparing them. This On-line TOC-VISH unit incorporates software-driven standardized resolution and system suitability tests. Testing is automatic, with setting the reagent being the only requirement. Primary applications include management of pharmaceutical water and ultra-pure and recycled water as used in the semiconductor industry, and the analysis of water flowing in water mains.