Analyser measures five gases simultaneously
July 2007
Analytical Instrumentation & Environmental Monitoring
The ENDA-600 series from Horiba includes a single analyser unit that measures NOX, SOx, CO, CO2 and O2. Using cross-flow modulated NDIR (non-dispersive infrared absorbance) detection - a method that is inherently drift-free - and a magneto-pneumatic bench for oxygen measurement (based on the principle that oxygen can be attracted into a magnetic field), this analyser provides long time stability, reducing the required frequency of calibrations.
A pyro-sensor monitors CO2 concentration in the sample gas. Since the analyser inherently has no zero drift, measurements are more stable over time. Because of this stability, the auto-calibration function is factory set to calibrate once in a seven-day period, and may be configured to calibrate from one to nine days.
For applications with high-dust samples, such as coal-fired boiler exhaust, a primary filter in the probe prevents dust from entering the sample system.
The analyser can be set to output instantaneous values on all five measured components, oxygen conversion values for three components, and the moving average for any two of the five measured components for a period anywhere from one to four hours.
An output port option is available to connect the system to an external device for remote confirmation of the system status. Since ambient air is used as the carrier gas for the oxygen bench, there is no need for cylinders of nitrogen carrier gas, saving valuable space and reducing operating costs.
A stainless steel sample gas probe is connected directly to the primary filter, while the dehumidifying system minimises loss of SO2 and NO2 from the sample gas.
For samples containing flammable or poisonous gases, a sample return line and a sample purge line can be provided. A purged enclosure is available for environments where flammable or poisonous gases may be present.
For more information contact Noel Bauchop, OEN Enterprises, +27 (0)11 675 4447, [email protected], www.oenenterprises.co.za
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