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Try ATI http://www.analyticaltechnology.com They go to 200ppm with standard units and higher depending on the chemistry details of the application.

If you have low pressure discharge, add a dampener and a back pressure valve. See http://www.youtube.com/watch?v=dva8VtiJU_U

H-Flume at TracomFRP Halmi Nozzle at Primaryflowsignal Hope that helps.

Depending on the range of gas quality this can be a standard application for thermal mass flow. For large flare lines you may need multi-point sensor to get the accuracy you need. Try FCI, Kurz, ABB etc.

At the risk of mentioning a specific product, there are stepper motor driven diaphragm dosing pumps on the market with integrated flow measurement (automated drawdown) and 4-20mA or Profibus feedback of the current delivery rate see http://www.alldos.com/pdf/209M-EN-15.820019.pdf

For ease of setup, interpretation and data management you should consider this unit from FUJI. http://www.ttiglobal.com/products/pdf/portaflow.pdf

There are a number of acoustic data collection and leak detection products out there. One of the bestis described at: http://www.radcom-usa.com/soundsens.htm

dfunk, For small capacity rechlorination applications one of the most common problems is pump failure due to degassing. While many of the small pump manufacturers can supply automatic degassing designs you should look at the double diaphragm design offered by Alldos. This head is specifically...

You want novel alternatives, consider supercritical fluid extraction for direct separation of target compound groups. Batch processing is a realistic possibility (eg. coffee decafination with CO2) if the product value is high enough and the batch size reasonable for pressure vessel sizing.

What about Ozone? Effective for colour removal, cost effectiveness very dependant on scale and value you can place on colour removal.

Try a submersible 2-wire well level transmitter. eg www.pressuresystems.com

Try www.primaryfluid.com - back pressure valves