Intro4u2u

Recent developments in NDIR Analysers include the ability to have multiple optical benches in one Analyser and stacked detectors that result in as many as four (4) gases being measured in a single instrument. Microprocessors have added many capabilities to modern NDIR analysers, which include a platform, where a single system controller provides the user interface for as many as 3 analytical modules. The system controller provides industry wide interfaces to control systems and common computer networks. MODBUS is included for control systems and Ethernet is provided for interfacing to personal computers. The interference filter correlation (IFC) photometric analysers such as the Multiwave have been enhanced through microprocessor technology to measure multiple components and also operate over Analyser networks. These Analysers have also been successfully applied to hot wet measurement demands by heating to temperatures as high as 200 C. The IFC approach allows a spectroscopist to evaluate a complex sample matrix and select proper wavelengths of light to make successful analytical measurements of the component of interest. These Analysers are custom built for the application. Improvements have also been made in the calibration of NDIR gas Analysers. By using calibration cells, small optical cells with actual test gases encapsulated within, Analyser calibration can be checked without bottles of expensive test gases. Ultraviolet (UV) Analysers are in general more sensitive than NDIR Analysers. Another advantage of UV Analysers is that water (H2O) is transparent to UV. SO2 and NOx are frequently measured with this technology. Other possibilities are NO2, H2S, CS2, COS, Cl2, NH3, and other gases. The UV Analyser utilises a 4 beam optical approach so that a double quotient can be formed and removes variables such as dirty windows and ageing of components so that the result is a more robust and stable analyser.