Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 84)

Model 9110TH NOx Analyzer Operating Instructions
Teledyne Analytical Instruments 64
 WARNINGS: Some data may be useful when stored if one of several
warning messages appears. This is helpful for trouble-shooting by
monitoring when a particular warning occurred.
4.7.2. DEFAULT DAS CHANNELS
The 9110TH/M is configured with a basic DAS configuration, which is enabled by
default. New data channels are also enabled by default but each channel may be turned
off for later or occasional use. Note that DAS operation is suspended while its
configuration is edited through the front panel. To prevent such data loss, it is
recommended to use the APICOM graphical user interface for DAS changes.
A set of default data channels has been included in the analyzer’s software for logging
nitrogen oxides concentrations, calibration and predictive diagnostic data. They are:
 CONC: Samples NO
X
, NO and NO
2
concentration at one minute intervals
and stores an average every hour with a time and date stamp along with the
number of (1-minute) samples within each average(for statistical
evaluation). Readings during calibration and calibration hold off are not
included in the data. By default, the last 800 hourly averages are stored.
 CALDAT: Every time a zero or span calibration is performed CALDAT
logs concentration, slope and offset values for NO
X
and NO with a time and
date stamp. The NO
X
stability (to evaluate calibration stability) as well as
the converter efficiency (for reference) are also stored. This data channel
will store data from the last 200 calibrations and can be used to document
analyzer calibration. The slope and offset data can be used to detect trends
in (instrument response.
 CALCHECK: This channel logs concentrations and the stability each time
a zero or span check (not calibration) is finished. This allows the user to
track the quality of zero and span responses over time and assist in
evaluating the quality of zero and span gases and the analyzer’s noise
specifications. The last 200 data points are retained.
 DIAG: Daily averages of temperature zones, flow and pressure data as well
as some other diagnostic parameters (HVPS, AZERO). These data are
useful for predictive diagnostics and maintenance of the 9110TH/M. The
last 1100 daily averages are stored to cover more than four years of analyzer
performance.
 HIRES: Records one minute, instantaneous data of all active parameters in
the 9110TH/M. Short-term trends as well as signal noise levels can be
detected and documented. Readings during calibration and the calibration
hold off period are included in the averages. The last 1500 data points are
stored, which covers a little more than one day of continuous data
acquisition. This data channel is disabled by default but may be turned on
when needed such as for trouble-shooting problems with the analyzer.