Teledyne GFC-7000E - Trace CO2 Analyzer - Manual (Page 109)

Model GFC7000E Instruction Manual Operating Instructions
04584 Rev A1 98
6.12.1.2. iDAS Parameters
Data parameters are types of data that may be measured and stored by the iDAS. 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
MGFC7000E. iDAS parameters include things like CO
2
concentration measurements, temperatures
of the various heater 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 6.7.6.
Note
iDAS does not keep track of the unit of each concentration value and iDAS 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 6-23: iDAS 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.
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 MGFC7000E provides about 30
parameters). However, the number of parameters and channels is ultimately limited by available
memory.
6.12.1.3. iDAS Triggering Events
Triggering events define when and how the iDAS records a measurement of any given data
channel. Triggering events are firmware-specific and a complete list of Triggers for this model
analyzer can be found in Appendix A-5. The most commonly used triggering events are:
• ATIMER: Sampling at regular intervals specified by an automatic timer. Most
trending information is usually stored at such regular intervals, which can be
instantaneous or averaged.