Proven technology in cross duct analysis of continuous emissions monitoring from within stacks has been also been developed to enable the measurement of average concentrations of gas in the ambient environment to distance of 500m.
The use of tuneable diode laser (TDL) technology, that looks at a single absorption line in the near infrared spectrum, eliminates any cross interference by other gases from occurring. The TDL approach also enables very low detection limits, down to ppb levels, to be achieved for many gases
The Open Path NEO technology has transferred to such an extent that up to 20 different gases - almost every gas that is measurable across a duct - may be measured in the open path situation.
The new system, which can be battery or mains operated, combines a transmitter with a receiver unit that sends laser beam to a retro reflector anything up to 500m away. The beam is bounced back to the combined transmitter receiver unit were the real time data is stored.
The system is very easy to set-up and align, even over long distances, by the deployment of a special sighting laser that targets the beam via the retro reflector to ensure that the best possible alignment is quickly achieved.