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Principles of Operation Teledyne API - Model T200H/T200M Operation Manual
310
8.8.4. 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 5.2.5).
8.8.5. INTERNAL DATA ACQUISITION SYSTEM (DAS)
The DAS 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 DAS has a consistent user
interface among all Teledyne API A-Series, E-Series, and T-Series instruments. New
data parameters and triggering events can be added to the instrument as needed. Section
6.7 describes the DAS and its default configuration in detail, Section 6.2 shows the
param
eters that can be used for predictive diagnostics.
Depending on the sampling frequency and the number of data parameters, the DAS can
store several months of data, which are retained even when the instrument is powered
off. However, if new firmware or a new DAS configuration are uploaded to the
analyzer, we recommend retrieving data before doing so to avoid data loss. The DAS
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 DAS data (Section 6.15.2.8)
07270B DCN6512