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Theory of Operation Teledyne API - Model 200EH/EM Operation Manual
230
10.7.4. NO
2
CONVERTER EFFICIENCY COMPENSATION
Over time, the molybdenum in the NO
2
converter oxidizes and looses its original capacity of converting NO
2
into
NO, eventually resulting in a decreased converter efficiency (CE). Even though we recommend to replace the
converter if CE drops below 96%, the analyzer’s firmware allows adjusting minor deviations of the CE from 1.000
and enables reporting the true concentrations of NO
2
and NO
X
. Converter efficiency is stored in the instrument’s
memory as a decimal fraction that is multiplied with the NO
2
and NO
X
measurements to calculate the final
concentrations for each. Periodically, this efficiency factor must be measured and - if it has changed from
previous measurements - entered into the analyzer’s memory (Section 7.1.5).
10.7.5. INTERNAL DATA ACQUISITION SYSTEM (IDAS)
The iDAS is designed to implement predictive diagnostics that stores trending data for users to anticipate when
an instrument will require service. Large amounts of data can be stored in non-volatile memory and retrieved in
plain text format for further processing with common data analysis programs. The iDAS has a consistent user
interface among all Teledyne Instruments A- and E-series instruments. New data parameters and triggering
events can be added to the instrument as needed. Section 6.7 describes the iDAS and its default configuration
in detail, Chapter 8 shows the parameters that can be used fo
r predictive diagnostics.
Dependin
g on the sampling frequency and the number of data parameters, the iDAS can store several months
of data, which are retained even when the instrument is powered off. However, if new firmware or a new iDAS
configuration are uploaded to the analyzer, we recommend retrieving data before doing so to avoid data loss.
The iDAS permits users to access the data through the instrument’s front panel or the remote interface. The
latter can automatically report stored data for further processing. APICOM, a user-friendly remote control
program is the most convenient way to view, retrieve and store iDAS data (Section 6.15.2.8)
USER NOTES:
04521C (DCN5731)