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General Information Model 9700
TELEDYNE BROWN ENGINEERING
Analytical Instruments
2 Sample Conditioning
When the flue gas is drawn into the analyzer system, it enters at a
relatively high temperature and carries a significant content of moisture,
dirt and corrosives. The sample stream is preconditioned to cool the gases
and remove contaminants. This processing of the sample assures clean and
continuous operation of the instrument.
A sample stream of flue gas, drawn into the sampling system by
negative pressure, flows through a two-way sample-calibration selector
valve installed at the sample inlet. The valve is used to introduce sample
gas into the system However, when the valve is rotated so that the handle
index faces the inside of the case (open port), atmospheric air is drawn into
a T-joint where a spray nozzle introduces a fine water mist. This mist cools
and wets the sample. A strainer is built into the system to prevent the
nozzle from being clogged by particulates in the cooling water.
Figure 1: Model 9700 Analyzer System