Rethink Sample System Automation

NeSSI provides new tools to tackle the challenges and improve performance.

By Robert N. Dubois, consulting analytical specialist

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System-centric health monitoring. Sensors and networking will enable expansion of monitoring to all elements of an analytical system. It will permit overall analytical system performance to appear in the control room as a traffic light status signal that tells the operator whether the complete process analytical system is good, bad or is still good but will soon require maintenance. This will improve the operator's confidence in the performance of the analyzer system.

The Path Forward
Bus systems undoubtedly will mature fairly quickly; many components including miniature flow meters, pressure sensors, smart heaters and both proportional and on/off automated valves either are available or will be in the next couple of years. Ability to purchase functional applets that could work across multiple analyzer systems will be truly revolutionary — they even may be fun to use. Today SAM functionality is embedded in more-complex analyzers such as gas chromatographs. Extending it to other analyzers demands a compact NeSSI-bus-enabled SAM. Until that's available we'll struggle to bring standardization and simplicity to our discipline. Until then we'll continue to supply ad hoc and proprietary solutions that will work — but not support our general move to Generation III microanalytical and by-line installations. Our objective is to allow a microanalytical manufacturer to be able to plug into the mechanical and communication rails — and configure its devices sampling tasks using off-the-shelf applets. This architecture finally will enable the sampling and analytical measurement to go hand-in-hand as an integrated package.

The cost and technical effort to move to complete sample-system automation will be high. However end users will gain significant rewards including higher reliability and lower maintenance costs. It'll take a clear vision and concerted effort to change the game — but the horse is out of the barn and it's only a matter of time before we'll look back and wonder why we clung to our manual systems for so long. However, until that time comes we'll continue, out of sheer habit, to build steel copies of wooden bridges.

More Information on NeSSI
The Center for Process Analytical Chemistry at the University of Washington serves as the forum for NeSSI development activities. It conducts workshops and presentations twice a year in Seattle. For additional reading or contact information, refer to:

Robert N. Dubois is a consulting analytical specialist based in Sherwood Park, Alberta, and a member of the NeSSI steering team at the Center for Process Analytical Chemistry, Seattle. E-mail him at
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