Teledyne T200, Operation Manual, Page: 159 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Data Acquisition System (DAS) and APICOM
157
7.1.3.3. EDITING DAS PARAMETERS
Data parameters are types of data that may be measured and stored by the DAS. For
each Teledyne API's 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 T200. DAS parameters include data such as NO
x
, NO and NO
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 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 5.4.3.4.
Note DAS does not keep track of the units (i.e. PPM or PPB) of each concentration
value. Therefore, DAS data files may contain concentration data recorded in
more than one type of unit if the units of measure were changed during data
acquisition
Each data parameter has user-configurable functions that define how the data are
recorded which are listed in 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 T200 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.
06858E DCN7057