Data Acquisition System (DAS) and APICOM
Teledyne API – Model T300/T300M CO Analyzer
166
7.1.6.
EDITING DAS PARAMETERS
Data parameters are types of data that may be measured and stored by the DAS. 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
T300/T300M. DAS 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 5.4.4.
Note
DAS does not keep track of the unit (e.g., PPM, PPB, etc.) of each
concentration value and DAS data files may contain concentrations in
more than one type of unit if the unit was changed during data
acquisition.
Each data parameter has user-configurable functions that define how the data are
recorded (refer to Table 7-3).
Table 7-3: DAS 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 T300/T300M 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 DAS can
store only data of one format (number of parameter columns, etc.) for any given
channel. In addition, a DAS configuration can only be uploaded remotely as an entire
set of channels. Hence, remote update of the DAS will always delete all current
channels and stored data.
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