Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 60)

Operating Instructions Model 9110EH Instruction Manual
or the COM port settings. The SETUP mode is also used for performing various diagnostic
tests during troubleshooting.
The third operating mode is the CAL mode, which allows calibration of the analyzer in
various ways. Because of its importance, this mode is described separately in Chapter 7.
The mode field (upper left corner) of the front panel display indicates the current operating
mode (refer to Figure 3-4 for front panel features). In addition to the three main modes,
there are mode variations, which are summarized in Table 0-1.
6.2. Sample Mode
This is the analyzer’s standard operating mode. In this mode, the instrument is analyzing
NO and NO
X
and calculating NO
2
concentrations.
6.2.1. Test Functions
A series of test functions is available at the front panel while the analyzer is in SAMPLE
mode. These parameters provide information about the present operating status of the
instrument and are useful during troubleshooting (Section 11.1). They can also be recorded
in one of the iDAS channels (Section 6.10.1.1) for data analysis. To view the test functions,
press one of the keys repeatedly in either direction.
NOTE
A value of “XXXX” displayed for any of the TEST functions indicates an out-of-
range reading or the analyzer’s inability to calculate it.
NOTE
All pressure measurements are represented in terms of absolute pressure.
Absolute, atmospheric pressure is 29.92 in-Hg-A at sea level. It decreases about 1
in-Hg per 300 m gain in altitude. A variety of factors such as air conditioning and
passing storms can cause changes in the absolute atmospheric pressure.
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