Teledyne 9110T - Nitrogen Oxides Analyzer - Manual (Page 69)

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.