water's conductivity. A second conductivity reading is taken and the online TOC sensor then calculates the organic burden in the water based on the difference between the two readings. Fast response and predictive maintenance At the demonstration we showed that exchange of the unit's compact UV lamp and subsequent calibration is an easy procedure that takes less than half the time than that of their existing sensor. Managers from the company were also impressed with the on-line TOC sensor's response of less than 60 seconds and high resolution of 0.001 ppb C. In addition, the sensor conve- niently records Peak and Average TOC measurements for simplified compliance monitoring. ozone measurement), therefore reducing complexity and simplifying operations at measurement points. The partnering M800 transmitter opens up a number of additional advantages. Its iMonitor display clearly shows the diagnostic tools that continuously check the on-line TOC sensor's operating condition. These tools allow any sensor maintenance, such as calibration, to be planned for when it will be required, rather than to a fixed schedule. Water purity protected The company was convinced and replaced its existing sensor with the on-line TOC sensor. Managers and technicians continue to be impressed with the unit's easy maintenance and reliability. Rapid identification of any water contamination by organics is now safely assured. c www.mt.com/6000TOCi The M800 is a multi-channel, multiparameter instrument and allows the connection of up to four sensors (for TOC, conductivity, pH, oxygen and 24 Pharmaceutical Waters METTLER TOLEDO 9http://www.mt.com/6000TOCi