Ambient ozone monitor with high sensitivity

November 2006 Analytical Instrumentation & Environmental Monitoring

The APOA-360 ambient ozone monitor from Horiba, uses the cross flow modulation type, ultra-violet-absorption method in conjunction with the comparative calculation method. This permits continuous measurement with great stability and high sensitivity such as F.S. 0,1 ppm. The sensitive, accurate, and minimal-maintenance APOA-360 provides precise atmospheric pollution monitoring data.

Horiba's innovative heated de-ozoniser provides reference gas by decomposing the O3 found in the sample gas. This has the advantages of reducing the influence from interference, making the monitor insensitive to great changes in moisture content, and prolonging the working life of the monitor. All gas connections are either Teflon or glass.

The ultra-violet-absorption method works on the principle that ozone absorbs ultra-violet rays in the area of 254 nm. Measurements are taken from continuous, alternate injections of the sample gas and the reference gas into the measurement cell, controlled by a long-life solenoid valve. The cross flow modulation method is characteristically zero drift-free. A comparative calculation circuit automatically compensates for all fluctuations in the mercury vapour light source and in the detector. This means that, in principle, the APOA-360 makes it possible to carry out zero-span drift-free, continuous measurements. Horiba's de-ozoniser for the comparison gas line is unaffected by interference elements or moisture retention, providing prolonged and stable measurements.

For more information contact Mike Andrews, OEN Enterprises, 011 675 4447, [email protected], www.oenenterprises.co.za

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