November 2017Analytical Instrumentation & Environmental Monitoring
The Mettler Toledo Thornton 3000CS analyser is an online instrument for direct measurement of chlorides and sulphates in pure water and power cycle chemistry samples. The analyser continuously monitors these highly corrosive contaminants to assist in corrosion control and minimising damage to critical power plant equipment. Early, unambiguous detection of trace levels of chloride and sulphate ions is provided with minimal operator supervision.
Chlorides and sulphates cause pitting and stress corrosion in expensive power plant components such as turbines and boilers, leading to extensive maintenance and unplanned shutdowns. Monitoring these ions at low ppb levels has therefore been identified as a key measurement in power plant chemistry.
The 3000CS uses microfluidic capillary electrophoresis, an ionic separation technology, to provide an alternative to expensive offline methods such as ion chromatography and inductively coupled plasma.
The analyser automatically performs direct chloride and sulphate measurements in the water/steam cycle. The most important point in the cycle is at the turbine inlet, to ensure that only acceptable levels of chlorides and sulphates enter with the steam into the turbine. For boiler feedwater monitoring, the analyser ensures low ppb level contaminants. For condensate monitoring, it detects breakthrough at condensate polisher of contaminants and deterioration of sulphated cation resin. Low chloride and sulphate levels are ensured in makeup water by monitoring them after all treatment stages, before the water is sent to the storage tank that feeds the water/steam cycle.
The unit features semi-automatic calibration and an intuitive touchscreen interface, allowing operation without the need for extensive training. Mettler Toledo's Intelligent Sensor Management technology in the analyser provides diagnostics that predict when maintenance or replacement of consumables will be required.
The 3000CS provides accurate chloride and sulphate measurement every 45 minutes without any operator intervention. It provides continuous monitoring of harmful ions and delivers a rapid return on investment by eliminating the need for costly internal or external laboratory tests.
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