July 2010Analytical Instrumentation & Environmental Monitoring
Emerson Process Management has introduced the Rosemount Analytical RDO optical dissolved oxygen sensor and analyser for use in wastewater aeration basins and ponds. The sensor is more resistant to fouling than polarographic sensors, an important advantage in wastewater where coating is a common problem.
The sensor is available with either integral or quick-disconnect cable. A fitting at the rear allows a threaded pipe to be screwed into the sensor so that it can be submerged. One advantage of the design is it does not need a flowing sample, so it works well in a low flow basin or pond.
Maintenance is fast and easy and consists primarily of replacing the sensing cap once a year. The analyser accepts one or two sensors. It has a two-line display, which can be customised to show mg/L (ppm) oxygen, percent saturation, oxygen partial pressure, or temperature for either sensor. The display can also be configured to show the current barometric pressure. Two loop-powered 4–20 mA analogue outputs can be assiged to either sensor and to any measurement (concentration, temperature, or partial pressure). Modbus/RS485 communication is also available as a standard feature. Calibration is simple and can be done either against a reference instrument or in water saturated air. Air calibration is completely automatic.
“The addition of the optical dissolved oxygen analyser and sensor to our product line is significant and enables Emerson to continue to be a provider of advanced and easy to use analysis technologies for wastewater applications,” said John Wright, vice president, Emerson Process Management, Rosemount Analytical. “Our focus has always been to meet real world customer demands for accuracy, advanced technology, ease of use, lowered cost of ownership and reduced maintenance requirements. The optical sensor fulfils that commitment.”
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