Teledyne T200, Руководство по эксплуатации, Страница: 297 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Principles of Operation
295
SAMPL E
PRESSURE
SENSOR
VACUUM
PRESSURE
SENSOR
O
3
FLOW
SENSOR
FLOW PRESSURE
SENSOR PCA
INSTRUMENT CHASSIS
PMT
NO/NO
X
VALVE
AUTOZERO
VALVE
O
3
Destruct
O
3
GENERATOR
O
3
Cleanser
EX HAUST
GAS OUTLET
SAMPLE
GAS INLET
NO
2
Converter
Orifice Dia.
0.004"
Orifice Dia.
0.010"
PUMP
NO
X
Ex
h
a
u
s
t
Sc
ru
b
b
e
r
OZONE DRYER
F
ilt
er
Orifice Dia.
0.004"
EXH
AU
ST
M
AN
IF
O
LD
Orifice Dia.
0.010"
COM
NC
NO
NC
COM
NO
Critical
Flow
Orifice’s
Figure 13-7: Location of Flow Control Assemblies & Critical Flow Orifices
Table 13-3: T200 Gas Flow Rates
Location Purpose
Orifice
Diameter
Flow rate
(nominal)
Sample gas inlet of reaction cell
Controls rate of flow of sample gas into the
reaction cell.
0.010” (0.25 mm) 500 cm³/min
O
3
supply inlet of reaction cell
Controls rate of flow of ozone gas into the
reaction cell.
0.004” (0.10 mm) 80 cm³/min
Dry air return of Sample dryer
Controls flow rate of dry air return / purge
air of the dryer.
0.004” (0.10 mm) 80 cm³/min
Vacuum manifold, Auto Zero port.
Controls rate of sample gas flow when
bypassing the reaction cell during the Auto
Zero cycle.
0.010” (0.25 mm) 500 cm³/min
Vacuum manifold, Internal span gas
generator exhaust port
Controls rate of flow of zero purge gas
through the optional Internal span gas
generator when it is installed.
0.003” (0.10 mm) 60 cm³/min
The necessary 2:1 ratios across the critical flow orifices is largely exceeded by the
pumps supplied with the analyzer which are designed to accommodate a wide range of
possible variability in atmospheric pressure and age related degradation of the pump
itself. Once the pump does degrade the ratio between sample and vacuum pressures
may fall to less than 2:1. At this point, the instrument will display an invalid sample
flow rate measurement (
XXXX ).
06858E DCN7057