Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 91)

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 73
6.7.1.2. DAS Parameters
Data parameters are types of data that may be measured and stored by the DAS. For each Teledyne
Instruments analyzer model, the list of available data parameters is different, fully defined and not
customizable. Appendix A-5 lists firmware specific data parameters for the analyzer. DAS parameters
include things like CO
2
concentration measurements, temperatures of the various heaters placed around
the analyzer, pressures and flows of the pneumatic subsystem and other diagnostic measurements as
well as calibration data such as slope and offset.
Most data parameters have associated measurement units, such as mV, ppb, cm³/min, etc., although
some parameters have no units. With the exception of concentration readings, none of these units of
measure can be changed. To change the units of measure for concentration readings See Section 6.8.6.
Note
DAS does not keep track of the unit of each concentration value and DAS data files
may contain concentrations in multiple units if the unit was changed during data
acquisition.
Each data parameter has user-configurable functions that define how the data are recorded:
Table 6-8: DAS Data Parameter Functions
FUNCTION EFFECT
PARAMETER Instrument-specific parameter name.
SAMPLE MODE INST: Records instantaneous reading.
AVG: Records average reading during reporting interval.
MIN: Records minimum (instantaneous) reading during reporting interval.
MAX: Records maximum (instantaneous) reading during reporting interval.
SDEV: Records the standard deviation of the data points recorded during the reporting interval.
PRECISION Decimal precision of parameter value (0-4).
STORE NUM.
SAMPLES
OFF: stores only the average (default).
ON: stores the average and the number of samples in each average for a parameter. This
property is only useful when the AVG sample mode is used. Note that the number of samples
is the same for all parameters in one channel and needs to be specified only for one of the
parameters in that channel.
Users can specify up to 50 parameters per data channel (the GFC 7000TA provides about 30
parameters). However, the number of parameters and channels is ultimately limited by available
memory.