Figure 3-27: Pneumatics With The Internal Span Gas Generator (Opt 50G) - Teledyne T200 Operation Manual

Getting Started
SAMPLE
GAS
INLET
ZERO/SPAN
VALVE
ZERO GAS
INLET
IZS OPTION w/
DESORBER
DRY AIR
OUTLET
Exhaust
Outlet
PUMP
Figure 3-27:
62
Teledyne API – T200 NO/NO
N A
ITRIC CID AND THE
H O reacts with NO to form HNO
2 2
passing the air supply for the span gas generator through a special dryer; however, the
permeable membrane of the NO
environment to slowly collect in the tube at increasingly higher concentrations. Over
time this results in the presence of HNO
the T200‟s pneumatics along with NO
HNO is a liquid at room temperature, so once the HNO
3
tube, it condenses and collects along the T200‟s wetted surfaces. While liquid HNO
does not directly affect the quality of NO
small amounts of gaseous HNO
converter, resulting in an artificially high NO
particularly bothersome when the T200 is attempting to measure a zero point, such as
during calibration, since the NO
majority of the HNO coating the wetted surfaces has reverted to NO
3
very long time.
To resolve this, the T200 includes a special HNO
given off by the permeation tube before it can be converted into NO by the analyzer‟s
converter.
P L
NEUMATIC AYOUT FOR
SAMPLE/ CAL
VALVE
NO COM
NC
COM
IZS Permeation
DESORBER
NC
Source
NO
Filter
Pneumatics with the Internal Span Gas Generator (OPT 50G)
C NO P
HEMISTRY OF
2
(nitric acid). The T200 mitigates this reaction by
3
tube will still allow H
2
in the permeation tube which is exuded into
3
.
2
measurements of the T200, it does give off
x
which is converted into NO by the T200‟s NO
3
2
concentration will only reach a true zero point once the
2
Z S
ERO CRUBBER AND
NO
2
Converter
NC
Orifice Dia.
0.010"
Orifice Dia.
0.010"
Orifice Dia.
0.003"
Orifice Dia.
0.004"
OZONE DRYER
/NO Analyzer Operation Manual
2 X
T
ERMEATION UBES
O from the ambient
2
is released by the permeation
3
concentration by 8% to 12%. This is
and this can take a
2
desorber, which eliminates any HNO
3
IZS (OPT 50G)
NO/NO
X
VALVE
NO COM
NC
FLOW PRESSURE
SAMPLE
PRESSURE
SENSOR
O FLOW
3
SENSOR
AUTOZERO
VALVE
COM
O
O
3
3
NO
Cleanser GENERATOR
Orifice Dia.
0.004"
O
3
Destruct
PMT
INSTRUMENT CHASSIS
06858E DCN7057
3
 NO
x
3
SENSOR PCA
VACUUM
PRESSURE
SENSOR