Process moisture analyser

March 2012 Analytical Instrumentation & Environmental Monitoring

The versatile Ametek Model 5000 is a highly sensitive moisture analyser for process applications where the continuous, reliable measurement of moisture in vapours and gases is required. The Model 5000 measures moisture online by monitoring the vibrational frequency change of a hygroscopically sensitised quartz crystal that is exposed alternately to wet sample and dry reference gas for 30 second periods. The reference gas is a sample gas passed through a molecular sieve dryer to remove virtually all its moisture content.

Many moisture analysers are susceptible to attack by the process stream. Unsaturated hydrocarbons, compressor oils, oxygen and carbon dioxide can permanently damage or destroy trace moisture sensors. Even worse, a fouled sensor can become completely unresponsive to moisture yet continue to give an output. This ‘dying-in-place’ behaviour leaves the process unmonitored.

The Model 5000 gives ‘bullet-proof’ performance in critical moisture applications. Its unique differential measurement principle, combined with continuous diagnostics, ensures reliable performance.

The field unit is explosion proof and is certified to comply with numerous international standards. It contains a sample cell, switching valves and associated electronic circuits mounted internally and a flow meter, flow control valves and back pressure regulator mounted externally.

The controller is also designed for use in industrial areas and is available with several standard and optional certifications. It provides all control and data processing, as well as a keypad and display interface. Outputs include RS485 bidirectional serial data, two fully configurable 4-20 mA analog signals and three configurable alarms. It can be separated from the field unit by up to 600 metres. The external dryer supplies the analyser with reference gas by using a molecular sieve to dry the actual process.

For more information contact Colwyn Savings, OEN Enterprises, +27 (0)11 675 4447, [email protected], www.oenenterprises.co.za

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