Fast response and accurate analysers

23rd November 2018

Controlling the production of speciality gases, a fast responding and high-resolution measurement system is required. This application demands a flexible design, adaptable to changing sample gas conditions, which will provide the basis for a high-quality product.

Since it was founded in 1989, Eco Physics has been continuously developing advanced NO/NO2/ NOX and NH3 analysers. From low ppt level analysers for atmospheric research to ambient air monitoring, continuous emissions monitoring, combustion research and testing exhaust gases containing up to 10,000ppm NOx, the company has a solution for almost every possible NO and NOx application.

The next generation of chemiluminescence analysers consists of intelligent modules, each equipped with its own PCB and linked to the main frame by BUS-communication. The touch panel in front allows an intuitive operation of the unit. The multiple digital and analogue output options enable easy integration into existing systems, as well as a remote operation and diagnosis of the instrument. Furthermore, the modular design offers tailor-made solutions according to the client’s request and beyond the standardised chemiluminescence analyser: for instance, a dual sample inlet, two parallel gas flow streams with heated sample lines, two reaction chambers with specialised metal converters, an internal pump and pressure regulation…just to mention a few.

Eco Physics’ dual channel dual PMT analysers are essentially two analysers inside one box. The dual reaction chambers and dual PMT detectors allow for simultaneous measurement of NO and NOx, and in combination with the high sensitivity PMT and firmware it makes the analysers extremely fast and ideal for applications requiring an extremely fast response, e.g. measurements done from a car or aircraft moving at high speeds, liquid NO measurements, roadside monitoring, gas blending applications, etc.

Due to the fast response, accuracy and fast stabilisation, gas manufacturers use these dual channel dual PMT NOx analysers for quality assurance and gas blending applications. In a gas blending station dozens of cylinders of certified, primary, NIST traceable and EPA protocol standards are filled at a given time. A side stream of the blend is redirected to the NOx analyser to monitor the concentration stability of gas as the cylinders are filled. Abbasi Hussain, one of the principal chemists at Airgas (an Air Liquide company), from the Specialty Gases Chicago facility, uses Eco Physics NOx analysers for gas blending application. They have been using the CLD 822S analyser for several years and have just added the new nCLD 822S to their pool.

“Eco Physics’ analyser is perfect for our dynamic blend system due to the sensitivity and extremely fast stabilisation time. The nCLD has even a faster stabilisation time than the previous models,” says Hussain.


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