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Principles of Operation
8.8.4. NO
CONVERTER EFFICIENCY COMPENSATION
2
8.8.5. INTERNAL DATA ACQUISITION SYSTEM (DAS)
306
Each of the terms in the above equation is attenuated by a gain function with a numerical
value based on a preset gain parameter (shown below in CAPITALIZED ITALICS)
normalized to the current value of the parameter being attenuated. The gain functions A,
B, C and D are defined as:
rcell
_
temp
(
K
A
=
1
+
[(
323
(
K
)
5
("
Hg
)
B
=
1
+
[(
rcell
_
pressure
("
rcell
_
temp
(
K
C
=
1
+
[(
323
(
K
)
box
_
temp
(
K
D
=
1
+
[(
298
(
K
)
The preset gain parameters are set at the factory and may vary from analyzer to analyzer.
Section 6.12 describes the method for enabling/disabling the TPC feature.
Over time, the molybdenum in the NO
of converting NO
into NO, eventually resulting in a decreased converter efficiency (CE).
2
Even though we recommend to replace the converter if CE drops below 90%, the
analyzer's firmware allows adjusting minor deviations of the CE from 1.000 and enables
reporting the true concentrations of NO
instrument's memory as a decimal fraction that is multiplied with the NO
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).
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 4.7 describes the
DAS and its default configuration in detail, Section 6.2 shows the parameters 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 4.15.2.8).
Teledyne API - Model T200H/T200M Operation Manual
)
1
× )
RCTEMP
_
TPC
1
× )
RCPRESS
_
TPC
Hg
)
)
1
× )
SPRESS
_
TPC
)
1
× )
BXTEMP
_
TPC
converter oxidizes and looses its original capacity
2
and NO
2
_
GAIN
]
_
GAIN
]
_
GAIN
]
_
GAIN
]
. Converter efficiency is stored in the
X
07270D DCN7141
(Equation 9-6)
(Equation 9-7)
(Equation 9-8)
(Equation 9-9)
and NO
2
X
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