Читать книгу Continuous Emission Monitoring - James A. Jahnke - Страница 113

Compact miniature CEM systems advertised as mini‐systems or microsystems can be obtained at costs less than one quarter of the cost of traditional CEM systems that use discrete analyzers mounted in an instrument rack located in a temperature‐controlled shelter. Although these systems are often designed for relatively clean or specialized applications, such as gas turbine NO_x monitoring, there are few technical barriers limiting system miniaturization for wider use. Increasing miniaturization in sensor design and microprocessor systems enables the compact construction of entire CEM systems that include extractive components, conditioning systems, and analytical systems (Josseau 2009; Koch et al. 2007). A single microprocessor can provide both system and analyzer control for multiple gas sensors. RS232‐RS485 outputs allow direct input into the plant distributive control system or environmental manager's computer.