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Data Acquisition System (DAS & APICOM Teledyne API T803 CO2/O2 Analyzer Operation Manual
130
7.1.1. DAS STATUS
The green SAMPLE LED on the instrument front panel, which indicates the
analyzer status, also indicates certain aspects of the DAS status:
Table 7-1: SAMPLE LED Status Indicators for DAS
LED STATE DAS STATUS
steady off
System is in calibration mode. Data logging can be enabled or disabled for this mode.
Calibration data are typically stored at the end of calibration periods, concentration data are
typically not sampled, diagnostic data should be collected.
blinking
Instrument is in hold-off mode, a short period after the system exits calibrations. DAS
channels can be enabled or disabled for this period. Concentration data are typically disabled
whereas diagnostic should be collected.
steady on
Sampling normally.
The DAS can be disabled, as opposed to suspended, only by disabling or deleting
its individual data channels.
7.1.2. DAS STRUCTURE
The DAS is designed around the feature of a “record”. A record is a single data
point. The type of data recorded in a record is defined by two properties:
PARAMETER type that defines the kind of data to be stored (e.g. the
average of gas concentrations measured with three digits of precision). See
Section 7.1.5.3.
A TRIGGER
event that defines
when the record is made (e.g. timer; every
time a calibration is performed, etc.). See Section 7.1.5.2.
The specific PARAMETER 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 relate
s one or more parameters with a specific trigger event
and various other operational characteristics related to the records being made
(e.g., the channel’s name, number of records to be made, time period between
records, whether or not the record is exported via the analyzer’s RS-232 port,
etc.).
The number of DAS objects are limited by the instrument’s finite storage
capacity. For information regarding the maximum number of channels,
parameters, and records and how to calculate the file size for each data channel,
refer to the DAS manual downloadable from the TAPI website at
http://www.teledyne-api.com/manuals/
, under Special Manuals.
07276B DCN6418