The data from automatic analyzers at stationary source monitoring stations must be accurate
enough to judge the compliance with the legal emission control standards and to control the
combustion conditions in industrial plants. When using automatic analyzers, it is important to
fully understand the measurement principles, structure, and features of each measurement
system and to establish and implement proper maintenance procedures (check items and
frequency, etc.) that take into consideration the ambient conditions of each emission source.
The following section first explains the general requirements of automatic analyzers, such as
sampling and recording systems and calibration gas adjustments, and then explains matters
specific to each analytical system of sulfur dioxide, nitrogen oxide, carbon monoxide, oxygen
and hydrogen chloride, including maintenance and management requirements.
Fig. 7.2.1 An example of automatic monitoring system structure
(1) Emission gas flow
(2) Emission gas
(3) Sampling tube
(4) Coarse filter
(5) Heater
(6) Conduit
(7) Sample inlet
(8) Calibration gas inlet
(9) Change-over valve
(10) Fine filter
(11) Dehumidifier
(12) Drain
(13) Suction pump
(14) Bypass
(15) Throttle valve
(16) Flow meter
(17) Analyzer
(18) Discharge
(19) Indicator/recorder
