Teledyne M200EU manual Pneumatics, Pneumatic Diagram With Zero/Span Option

Ultra Sensitivity Model M200EU NO/NO2/NOx Analyzer Addendum to M200E

3. PNEUMATICS

Refer to the following pneumatic diagram. It shows the internal pneumatics of the M200EU in its standard configuration, along with the optional Zero/Span valves. The sample flow is about 1000 cc/min. Also during Auto Zero mode, the sample gas is routed through a pre-reactor before the mixture goes through the reaction cell. Since the reaction rate constant between NO and ozone is several time faster than the reaction rate constant between hydrocarbons and ozone, this mechanism helps to eliminate the interference effects of hydrocarbons in NOx measurements. In addition, the M200EU is equipped with a high performance pump, capable of producing a reaction cell pressure of less than 5 Inch Hg absolute.

Figure 3-1: Pneumatic Diagram With Zero/Span Option

4 TAPI 05385 Rev B

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