The CLD 88 Y p fulfills the requirements of many research groups specializing in detecting and monitoring smallest variations of NO2  concentrations in less than thirty seconds despite its total sample flow. The lagtime of less than a second makes it even more attractive. NO2  measurement is accomplished by a sequential detection of NO and NOX . The pre-chamber minimizes zero drift and cross sensitivity. This makes it ideally suited for areas with excellent air quality. For specific measurements the Y converter can be replaced by the optionally available photolytic converterunit PLC860.