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Ultra Sensitivity Model M200EU NO/NO
2
/NOx Analyzer Addendum to M200E
4 TAPI 05385 Rev B
PRINTED DOCUMENTS ARE UNCONTROLLED
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