The ENDA-600 Series is a lineup of analyzers for the highly sensitive and accurate measurement of NOx, SO2, CO, CO2, and O2 stack gases emitted from combustion furnaces and the boilers of thermoelectric power plants. The units are capable of the simultaneous and continuous measurement of five different components using only one analysis device. The economical, space-saving, low-maintenance units offer stable monitoring over the long term and are equipped with such standard functions as automatic calibration, calculation, moving average, external confirmation direct output, and self-diagnosis. Offering superior operability and minimal maintenance, the sampling systems have been standardized into six types, including those for monitoring boiler gases, waste incineration, mining, and processing, thereby providing users with a choice of systems that meet the demands of a variety of fields and uses. For example, the ENDA-625 (CO/O2) is especially suited for stable combustion control and waste incineration plants, which are subject to laws regarding the emission of dioxins.