Table of Contents
Advertisement
4. PNEUMATICS
Figure 4-1 shows the internal pneumatics of the T200U in its standard
configuration, along with the optional Zero/Span valves. The sample flow
is 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 times 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 T200U is equipped with a high performance pump,
capable of producing a reaction cell pressure of less than 5 Inch Hg
absolute.
SAMPLE
GAS
INLET
OPTION, ZERO/SPAN
VALVES, P/N 042340100
SAMPLE/CAL
VALVE
NO
ZERO
NO
COM
NC
ZERO/SPAN
VALVE
SPAN
EXHAUST
GAS OUTLET
PUMP
Figure 4-1. T200U Pneumatic Diagram with Zero/Span Option
COM
Orifice Dia.
NC
0.007"
PREREACTOR
Orifice Dia.
VALVE
0.004"
NC
COM
NO
Orifice Dia.
0.014"
O
Destruct
3
Orifice Dia.
0.004"
PERMAPURE
DRYER
NO/NO
X
VALVE
NO
2
NO
COM
Converter
NC
O
3
O
GENERATOR
3
Cleanser
PREREACTOR
GOLD
REACTION
CELL
PMT
FLOW PRESSURE
SENSOR PCA
SAMPLE
PRESSURE
SENSOR
VACUUM
PRESSURE
SENSOR
INSTRUMENT CHASSIS
15
Advertisement
Table of Contents
