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Model 9110T NOx Analyzer Data Acquisition System (DAS) and APICOM
Teledyne Analytical Instruments 164
Note The DAS can be disabled only by disabling or deleting its individual data
channels.
7.1. DAS STRUCTURE
The DAS is designed around the feature of a “record”. A record is a single data point. The type of data
captured in a record are defined by two properties:
PARAMETER type that defines the kind of data to be stored (e.g. the average of O
3
concentrations
measured with three digits of precision). See Section 7.1.3.3.
A TRIGGER event that defines when the record is made (e.g. timer; every time a calibration is
performed, etc.). See Section 7.1.3.2.
The specific PARAMETERS and TRIGGER events that describe an individual record are defined in a
construct called a DATA CHANNEL (see Section 7.1.3). Each data channel relates one or more
parameters with a specific trigger event and various other operational characteristics related to the
records being made (e.g. the channels name, number or records to be made, time period between records,
whether or not the record is exported via the analyzer’s RS-232 port, etc.).
7.1.1. DAS CHANNELS
The key to the flexibility of the DAS is its ability to store a large number of combinations of triggering
events and data parameters in the form of data channels. Users may create up to 20 data channels and
each channel can contain one or more parameters. For each channel, the following are selected:
one triggering event
up to 50 data parameters, which can be the shared between channels.
several other properties that define the structure of the channel and allow the user to make
operational decisions regarding the channel.
Table 7-2: DAS Data Channel Properties
PROPERTY DESCRIPTION
DEFAULT
SETTING
SETTING RANGE
NAME The name of the data channel.
“NONE”
Up to 6 letters or digits
1
.
TRIGGERING
EVENT
The event that triggers the data channel to
measure and store the datum.
ATIMER
Any available event
(see Appendix A-5).
NUMBER AND
LIST OF
PARAMETERS
A user-configurable list of data types to be
recorded in any given channel.
1
(PMTDET)
Any available parameter
(see Appendix A-5).
REPORT PERIOD
The amount of time between each channel data
point.
000:01:00
(1 hour)
000:00:01 to
366:23:59
(Days:Hours:Minutes)
NUMBER OF
RECORDS
The number of reports that will be stored in the
data file. Once the limit is exceeded, the oldest
data is over-written.
100
1 to 1 million, limited by
available storage space.
RS-232 REPORT
Enables the analyzer to automatically report
channel values to the RS-232 ports.
OFF
OFF or ON