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Model 9110TH NOx Analyzer Getting Started
Teledyne Analytical Instruments 69
Table 3-10: Valve Operating States OPT 50B installed
MODE VALVE CONDITION
VALVE PORT
STATUS
SAMPLE
Sample/Cal Open to SAMPLE inlet
3 2
Zero/Span Open to ZERO AIR inlet
3 2
Span Shutoff
Closed
Zero Air Shutoff
Closed
ZERO CAL
Sample/Cal Open to ZERO/SPAN Valve
1 2
Zero/Span Open to ZERO AIR inlet
3 2
Span Shutoff
OPEN
Zero Air Shutoff
1
Closed
SPAN CAL
Sample/Cal Open to ZERO/SPAN Valve
1 2
Zero/Span Open to SPAN inlet
1 2
Span Shutoff
Closed
Zero Air Shutoff
OPEN
3.3.2.5. Zero Scrubber and Internal Span Source (IZS) (OPT 50G)
The 9110T nitrogen oxides analyzer can also be equipped with an internal NO
2
span gas generator and
calibration valve option. This option package is intended for applications where there is a need for
frequent automated calibration checks without access to an external source of span gas.
This valve package includes:
A 2-stage external scrubber for producing zero air.
50% Purafil Chemisorbant
®
(for conversion of NO NO
2
).
50% charcoal (for removal of the NO
2
).
A heated enclosure for a NO
2
permeation tube.
This option package DOES NOT contain an actual permeation tube. See
Section 1.4 (Options 52B and 52G) for information on specifying the correct
permeation tube for each application.
A special desorber that removes all HNO
3
from the calibration gas stream.
One additional gas inlet port (ZERO AIR).
One additional gas outlet port (FROM DRYER).
Two internal valves for switching between the sample gas inlet and the output of the zero/span
subsystem.