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Advanced Features Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 115
Triggering events are firmware-specific and a complete list of Triggers for this model analyzer can be
found in Appendix A-5.
7.1.5.3. Editing iDAS Parameters
Data parameters are types of data that may be measured and stored by the iDAS. For each 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 GFC 7001E/EM. iDAS parameters include things like CO 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 stability, slope and
offset.
Most data parameters have associated measurement units, such as mV, ppb, cm³/min, etc., although some
parameters have no units (e.g. SLOPE). 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 6.6.4.
Note
iDAS does not keep track of the units (i.e. PPM or PPB) of each concentration value therefore iDAS data
files may contain concentrations data recorded in more than one the type of unit if the units of measure
was changed during data acquisition.
Each data parameter has user-configurable functions that define how the data are recorded.
Table 7-3: iDAS Data Parameter Functions
FUNCTION EFFECT
PARAMETER
Instrument-specific parameter name.
SAMPLE MODE INST: Records instantaneous reading.
AVG: Records average reading during reporting interval.
SDEV: Records the standard deviation of the data points recorded during the reporting interval.
MIN: Records minimum (instantaneous) reading during reporting interval.
MAX: Records maximum (instantaneous) reading during reporting interval.
PRECISION 0 to 4: Sets the number of digits to the right decimal point for each record.
Example: Setting 4; “399.9865 PPB”
Setting 0; “400 PPB”
STORE NUM
SAMPLES
OFF: Stores only the average (default).
ON: Stores the average and the number of samples in used to compute the value of the
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 7001E/EM provides about 40 parameters).
However, the number of parameters and channels is ultimately limited by available memory.
Data channels can be edited individually from the front panel without affecting other data channels. However,
when editing a data channel, such as during adding, deleting or editing parameters, all data for that particular
channel will be lost, because the iDAS can store only data of one format (number of parameter columns, etc.) for
any given channel. In addition, an iDAS configuration can only be uploaded remotely as an entire set of
channels. Hence, remote update of the iDAS will always delete all current channels and stored data.