Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 233)

Theory of Operation Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 215
9.5.4. Temperature and Pressure Compensation
Changes in pressure can have a noticeable, effect on the CO
2
concentration calculation. To account for
this, the Model GFC 7000TA software includes a feature which allows the instrument to compensation of
the CO
2
calculations based on changes in ambient pressure.
The TPC feature multiplies the analyzer’s CO
2
concentration by a factor which is based on the difference
between the ambient pressure of the sample gas normalized to standard atmospheric pressure. As
ambient pressure increases, the compensated CO
2
concentration is increased.
9.5.5. 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 in all Teledyne Instruments analyzers. New data parameters and triggering
events can be added to the instrument as needed.
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 or a new firmware is
installed. The DAS permits users to access the data through the instrument’s front panel or the remote
interface. The latter can automatically download stored data for further processing. For information on
using the DAS, refer to Sections 6.12.