Teledyne 9700 instruction manual General Information, Sample Conditioning

General Information Model 9700

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

2 TELEDYNE BROWN ENGINEERING

Analytical Instruments