Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 189)

Model 9110EH Instruction Manual Theory of Operation
cm³/min), a warning message OZONE FLOW WARNING is displayed on the analyzer’s
front panel (Section 6.2.2) and the O
3
generator is turned off. As second warning, OZONE
GEN OFF, is displayed. This flow measurement is viewable through instrument’s front panel
display as the test function OZONE FL.
10.2.11. Dilution Manifold
Certain applications require to measure NO
X
in sample gases that do not contain any
oxygen. However, the molybdenum NO
2
converter requires a minimum amount of oxygen
to operate properly and to ensure constant conversion efficiency. For these special
applications, the M9110EH analyzer may be equipped with a dilution manifold (Figure 10-11)
to provide the instrument with an internal sample stream that contains about 2.5% O
2
. This
manifold is mounted between converter housing and vacuum manifold on a small mounting
bracket. The manifold is equipped with two orifice holders that control the flow of the O
2
-
free sample gas and the bleeds in a small amount of zero air before the combined sample
stream goes to the NO/NO
X
valve for measurement. The zero air is produced by an external
zero air scrubber cartridge, mounted on the rear panel (Figure 3-3 and Figure 9-4).
Figure 10-11: Dilution Manifold
Please inquire with Teledyne-AI sales if the Model 9110EH can be modified to fit your application.
10.3. Electronic Operation
Figure 10-12 shows a block diagram of the major electronic components of the Model 9110EH.
The core of the analyzer is a microcomputer (CPU) that controls various internal processes,
interprets data, calculates data, and reports results using specialized firmware developed by
TAI
. It communicates with the user, receives data from and issues commands to a variety
M9110EH Rev 0 175