DESCRIPTION
The Model 400 CLD NO/NOx Analyzer is designed to continuously measure the total concentration of oxides of nitrogen within a gaseous sample. The gaseous sample can be ambient air, exhaust gases from an internal combustion engine, or exhaust gases from a combustion process.
METHOD OF OPERATION
The California Analytical Instruments Model 400 CLD Analyzer utilizes the chemiluminescence principle for analyzing the NO or NOx concentration in a gaseous sample. In the NO mode, the chemiluminescence reaction between ozone and nitric oxide (NO) yields excited nitrogen dioxide (NO2* ) and oxygen. Approximately 10% of the NO2* produced from this reaction is in an electronically excited state. The transition from this state to a normal state produces light intensity proportional to the mass flow rate of NO2 into the temperature controlled reaction chamber. The light is measured with a photodiode and associated amplification electronics. In the NOx mode, NO plus NO2 is determined. The sample is first routed through the internal converter which converts the NO2 in the sample to NO. The converter is preconditioned vitreous carbon; operating at relatively low temperatures of 130-200°C. Has an operating life of 106 ppm hours or one year. NO2 concentrations can be converted in the entire range of the analyzer.

DESCRIPTION
The Model 400 HCLD NO/NOx Analyzer is designed to continuously measure the total concentration of oxides of nitrogen within a gaseous sample. The gaseous sample can be ambient air, exhaust gases from an internal combustion engine, or exhaust gases from a combustion process. A wet measurement method may be desirable for the direct calculation of mass emissions. The Model 400 HCLD has been designed to meet the specific requirements of the U.S. E.P.A. Federal Register, Title 40, Subpart D and Subpart N.

METHOD OF OPERATION
The California Analytical Instruments Model 400 HCLD Analyzer utilizes the principle of chemiluminescence for analyzing the NO or NOx concentration within a gaseous sample. In the NO mode, the method is based upon the chemiluminescent reaction between ozone and nitric oxide (NO) yielding nitrogen dioxide (NO2) and oxygen. Approximately 10% of the NO2 produced from this reaction is in an electronically excited state. The transition from this state to a normal state produces light which has an intensity proportional to the mass flow rate of NO2 into the reaction chamber. The light is measured by means of a photodiode tube and associated amplification electronics. In the NOx mode, NO plus NO2 is determined as above, however, the sample is first routed through the internal NO2 to NO converter which converts the NO2 in the sample to NO. The resultant reaction is then directly proportional to the total concentration of NOx. The entire sample, prior to the reaction chamber, is maintained at a temperature of 65°C.

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